commit files

.gitignore

@@ -0,0 +1 @@
+*.pkl

app.py

@@ -0,0 +1,103 @@
+import os
+import sys
+
+import torch
+import cv2
+import PIL.Image
+import numpy as np
+import gradio as gr
+from yarg import get
+
+from models.stylegan_generator import StyleGANGenerator
+from models.stylegan2_generator import StyleGAN2Generator
+
+VALID_CHOICES = [
+    "Bald",
+    "Young",
+    "Mustache",
+    "Eyeglasses",
+    "Hat",
+    "Smiling"
+]
+ENABLE_GPU = False
+MODEL_NAMES = [
+    'stylegan_ffhq',
+    'stylegan2_ffhq'
+]
+NB_IMG = 4
+OUTPUT_LIST = [gr.outputs.Image(type="pil", label="Generated Image") for _ in range(NB_IMG)] + [gr.outputs.Image(type="pil", label="Modified Image") for _ in range(NB_IMG)]
+
+def tensor_to_pil(input_object):
+    """Shows images in one figure."""
+    if isinstance(input_object, dict):
+        im_array = []
+        images = input_object['image']
+    else:
+        images = input_object
+    for _, image in enumerate(images):
+        im_array.append(PIL.Image.fromarray(image))
+    return im_array
+
+def get_generator(model_name):
+    if model_name == 'stylegan_ffhq':
+        generator = StyleGANGenerator(model_name)
+    elif model_name == 'stylegan2_ffhq':
+        generator = StyleGAN2Generator(model_name)
+    else:
+        raise ValueError('Model name not recognized')
+    if ENABLE_GPU:
+        generator = generator.cuda()
+    return generator
+
+
+def inference(seed, choice, model_name, coef, nb_images=NB_IMG):
+    np.random.seed(seed)
+
+    boundary = np.squeeze(np.load(open(os.path.join('boundaries', model_name, 'boundary_%s.npy' % choice), 'rb')))
+    generator = get_generator(model_name)
+    latent_codes = generator.easy_sample(nb_images)
+    if ENABLE_GPU:
+        latent_codes = latent_codes.cuda()
+        generator = generator.cuda()
+    generated_images = generator.easy_synthesize(latent_codes)
+    generated_images = tensor_to_pil(generated_images)
+
+    new_latent_codes = latent_codes.copy()
+    for i, _ in enumerate(generated_images):
+        new_latent_codes[i, :] +=  boundary*coef
+
+    modified_generated_images = generator.easy_synthesize(new_latent_codes)
+    modified_generated_images = tensor_to_pil(modified_generated_images)
+
+    return generated_images + modified_generated_images
+
+
+iface = gr.Interface(
+    fn=inference, 
+    inputs=[
+        gr.inputs.Slider(
+            minimum=0,
+            maximum=1000,
+            step=1,
+            default=264,
+        ),
+        gr.inputs.Dropdown(
+            choices=VALID_CHOICES,
+            type="value",
+        ),
+        gr.inputs.Dropdown(
+            choices=MODEL_NAMES,
+            type="value",
+        ),
+        gr.inputs.Slider(
+            minimum=-3,
+            maximum=3,
+            step=0.1,
+            default=0,
+        ),
+    ],
+    outputs=OUTPUT_LIST,
+    layout="horizontal",
+    theme="peach"
+)
+iface.launch()

dnnlib/__init__.py

@@ -0,0 +1,9 @@
+# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+#
+# NVIDIA CORPORATION and its licensors retain all intellectual property
+# and proprietary rights in and to this software, related documentation
+# and any modifications thereto.  Any use, reproduction, disclosure or
+# distribution of this software and related documentation without an express
+# license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+from .util import EasyDict, make_cache_dir_path

dnnlib/util.py

@@ -0,0 +1,491 @@
+# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+#
+# NVIDIA CORPORATION and its licensors retain all intellectual property
+# and proprietary rights in and to this software, related documentation
+# and any modifications thereto.  Any use, reproduction, disclosure or
+# distribution of this software and related documentation without an express
+# license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+"""Miscellaneous utility classes and functions."""
+
+import ctypes
+import fnmatch
+import importlib
+import inspect
+import numpy as np
+import os
+import shutil
+import sys
+import types
+import io
+import pickle
+import re
+import requests
+import html
+import hashlib
+import glob
+import tempfile
+import urllib
+import urllib.request
+import uuid
+
+from distutils.util import strtobool
+from typing import Any, List, Tuple, Union
+
+
+# Util classes
+# ------------------------------------------------------------------------------------------
+
+
+class EasyDict(dict):
+    """Convenience class that behaves like a dict but allows access with the attribute syntax."""
+
+    def __getattr__(self, name: str) -> Any:
+        try:
+            return self[name]
+        except KeyError:
+            raise AttributeError(name)
+
+    def __setattr__(self, name: str, value: Any) -> None:
+        self[name] = value
+
+    def __delattr__(self, name: str) -> None:
+        del self[name]
+
+
+class Logger(object):
+    """Redirect stderr to stdout, optionally print stdout to a file, and optionally force flushing on both stdout and the file."""
+
+    def __init__(self, file_name: str = None, file_mode: str = "w", should_flush: bool = True):
+        self.file = None
+
+        if file_name is not None:
+            self.file = open(file_name, file_mode)
+
+        self.should_flush = should_flush
+        self.stdout = sys.stdout
+        self.stderr = sys.stderr
+
+        sys.stdout = self
+        sys.stderr = self
+
+    def __enter__(self) -> "Logger":
+        return self
+
+    def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None:
+        self.close()
+
+    def write(self, text: Union[str, bytes]) -> None:
+        """Write text to stdout (and a file) and optionally flush."""
+        if isinstance(text, bytes):
+            text = text.decode()
+        if len(text) == 0: # workaround for a bug in VSCode debugger: sys.stdout.write(''); sys.stdout.flush() => crash
+            return
+
+        if self.file is not None:
+            self.file.write(text)
+
+        self.stdout.write(text)
+
+        if self.should_flush:
+            self.flush()
+
+    def flush(self) -> None:
+        """Flush written text to both stdout and a file, if open."""
+        if self.file is not None:
+            self.file.flush()
+
+        self.stdout.flush()
+
+    def close(self) -> None:
+        """Flush, close possible files, and remove stdout/stderr mirroring."""
+        self.flush()
+
+        # if using multiple loggers, prevent closing in wrong order
+        if sys.stdout is self:
+            sys.stdout = self.stdout
+        if sys.stderr is self:
+            sys.stderr = self.stderr
+
+        if self.file is not None:
+            self.file.close()
+            self.file = None
+
+
+# Cache directories
+# ------------------------------------------------------------------------------------------
+
+_dnnlib_cache_dir = None
+
+def set_cache_dir(path: str) -> None:
+    global _dnnlib_cache_dir
+    _dnnlib_cache_dir = path
+
+def make_cache_dir_path(*paths: str) -> str:
+    if _dnnlib_cache_dir is not None:
+        return os.path.join(_dnnlib_cache_dir, *paths)
+    if 'DNNLIB_CACHE_DIR' in os.environ:
+        return os.path.join(os.environ['DNNLIB_CACHE_DIR'], *paths)
+    if 'HOME' in os.environ:
+        return os.path.join(os.environ['HOME'], '.cache', 'dnnlib', *paths)
+    if 'USERPROFILE' in os.environ:
+        return os.path.join(os.environ['USERPROFILE'], '.cache', 'dnnlib', *paths)
+    return os.path.join(tempfile.gettempdir(), '.cache', 'dnnlib', *paths)
+
+# Small util functions
+# ------------------------------------------------------------------------------------------
+
+
+def format_time(seconds: Union[int, float]) -> str:
+    """Convert the seconds to human readable string with days, hours, minutes and seconds."""
+    s = int(np.rint(seconds))
+
+    if s < 60:
+        return "{0}s".format(s)
+    elif s < 60 * 60:
+        return "{0}m {1:02}s".format(s // 60, s % 60)
+    elif s < 24 * 60 * 60:
+        return "{0}h {1:02}m {2:02}s".format(s // (60 * 60), (s // 60) % 60, s % 60)
+    else:
+        return "{0}d {1:02}h {2:02}m".format(s // (24 * 60 * 60), (s // (60 * 60)) % 24, (s // 60) % 60)
+
+
+def format_time_brief(seconds: Union[int, float]) -> str:
+    """Convert the seconds to human readable string with days, hours, minutes and seconds."""
+    s = int(np.rint(seconds))
+
+    if s < 60:
+        return "{0}s".format(s)
+    elif s < 60 * 60:
+        return "{0}m {1:02}s".format(s // 60, s % 60)
+    elif s < 24 * 60 * 60:
+        return "{0}h {1:02}m".format(s // (60 * 60), (s // 60) % 60)
+    else:
+        return "{0}d {1:02}h".format(s // (24 * 60 * 60), (s // (60 * 60)) % 24)
+
+
+def ask_yes_no(question: str) -> bool:
+    """Ask the user the question until the user inputs a valid answer."""
+    while True:
+        try:
+            print("{0} [y/n]".format(question))
+            return strtobool(input().lower())
+        except ValueError:
+            pass
+
+
+def tuple_product(t: Tuple) -> Any:
+    """Calculate the product of the tuple elements."""
+    result = 1
+
+    for v in t:
+        result *= v
+
+    return result
+
+
+_str_to_ctype = {
+    "uint8": ctypes.c_ubyte,
+    "uint16": ctypes.c_uint16,
+    "uint32": ctypes.c_uint32,
+    "uint64": ctypes.c_uint64,
+    "int8": ctypes.c_byte,
+    "int16": ctypes.c_int16,
+    "int32": ctypes.c_int32,
+    "int64": ctypes.c_int64,
+    "float32": ctypes.c_float,
+    "float64": ctypes.c_double
+}
+
+
+def get_dtype_and_ctype(type_obj: Any) -> Tuple[np.dtype, Any]:
+    """Given a type name string (or an object having a __name__ attribute), return matching Numpy and ctypes types that have the same size in bytes."""
+    type_str = None
+
+    if isinstance(type_obj, str):
+        type_str = type_obj
+    elif hasattr(type_obj, "__name__"):
+        type_str = type_obj.__name__
+    elif hasattr(type_obj, "name"):
+        type_str = type_obj.name
+    else:
+        raise RuntimeError("Cannot infer type name from input")
+
+    assert type_str in _str_to_ctype.keys()
+
+    my_dtype = np.dtype(type_str)
+    my_ctype = _str_to_ctype[type_str]
+
+    assert my_dtype.itemsize == ctypes.sizeof(my_ctype)
+
+    return my_dtype, my_ctype
+
+
+def is_pickleable(obj: Any) -> bool:
+    try:
+        with io.BytesIO() as stream:
+            pickle.dump(obj, stream)
+        return True
+    except:
+        return False
+
+
+# Functionality to import modules/objects by name, and call functions by name
+# ------------------------------------------------------------------------------------------
+
+def get_module_from_obj_name(obj_name: str) -> Tuple[types.ModuleType, str]:
+    """Searches for the underlying module behind the name to some python object.
+    Returns the module and the object name (original name with module part removed)."""
+
+    # allow convenience shorthands, substitute them by full names
+    obj_name = re.sub("^np.", "numpy.", obj_name)
+    obj_name = re.sub("^tf.", "tensorflow.", obj_name)
+
+    # list alternatives for (module_name, local_obj_name)
+    parts = obj_name.split(".")
+    name_pairs = [(".".join(parts[:i]), ".".join(parts[i:])) for i in range(len(parts), 0, -1)]
+
+    # try each alternative in turn
+    for module_name, local_obj_name in name_pairs:
+        try:
+            module = importlib.import_module(module_name) # may raise ImportError
+            get_obj_from_module(module, local_obj_name) # may raise AttributeError
+            return module, local_obj_name
+        except:
+            pass
+
+    # maybe some of the modules themselves contain errors?
+    for module_name, _local_obj_name in name_pairs:
+        try:
+            importlib.import_module(module_name) # may raise ImportError
+        except ImportError:
+            if not str(sys.exc_info()[1]).startswith("No module named '" + module_name + "'"):
+                raise
+
+    # maybe the requested attribute is missing?
+    for module_name, local_obj_name in name_pairs:
+        try:
+            module = importlib.import_module(module_name) # may raise ImportError
+            get_obj_from_module(module, local_obj_name) # may raise AttributeError
+        except ImportError:
+            pass
+
+    # we are out of luck, but we have no idea why
+    raise ImportError(obj_name)
+
+
+def get_obj_from_module(module: types.ModuleType, obj_name: str) -> Any:
+    """Traverses the object name and returns the last (rightmost) python object."""
+    if obj_name == '':
+        return module
+    obj = module
+    for part in obj_name.split("."):
+        obj = getattr(obj, part)
+    return obj
+
+
+def get_obj_by_name(name: str) -> Any:
+    """Finds the python object with the given name."""
+    module, obj_name = get_module_from_obj_name(name)
+    return get_obj_from_module(module, obj_name)
+
+
+def call_func_by_name(*args, func_name: str = None, **kwargs) -> Any:
+    """Finds the python object with the given name and calls it as a function."""
+    assert func_name is not None
+    func_obj = get_obj_by_name(func_name)
+    assert callable(func_obj)
+    return func_obj(*args, **kwargs)
+
+
+def construct_class_by_name(*args, class_name: str = None, **kwargs) -> Any:
+    """Finds the python class with the given name and constructs it with the given arguments."""
+    return call_func_by_name(*args, func_name=class_name, **kwargs)
+
+
+def get_module_dir_by_obj_name(obj_name: str) -> str:
+    """Get the directory path of the module containing the given object name."""
+    module, _ = get_module_from_obj_name(obj_name)
+    return os.path.dirname(inspect.getfile(module))
+
+
+def is_top_level_function(obj: Any) -> bool:
+    """Determine whether the given object is a top-level function, i.e., defined at module scope using 'def'."""
+    return callable(obj) and obj.__name__ in sys.modules[obj.__module__].__dict__
+
+
+def get_top_level_function_name(obj: Any) -> str:
+    """Return the fully-qualified name of a top-level function."""
+    assert is_top_level_function(obj)
+    module = obj.__module__
+    if module == '__main__':
+        module = os.path.splitext(os.path.basename(sys.modules[module].__file__))[0]
+    return module + "." + obj.__name__
+
+
+# File system helpers
+# ------------------------------------------------------------------------------------------
+
+def list_dir_recursively_with_ignore(dir_path: str, ignores: List[str] = None, add_base_to_relative: bool = False) -> List[Tuple[str, str]]:
+    """List all files recursively in a given directory while ignoring given file and directory names.
+    Returns list of tuples containing both absolute and relative paths."""
+    assert os.path.isdir(dir_path)
+    base_name = os.path.basename(os.path.normpath(dir_path))
+
+    if ignores is None:
+        ignores = []
+
+    result = []
+
+    for root, dirs, files in os.walk(dir_path, topdown=True):
+        for ignore_ in ignores:
+            dirs_to_remove = [d for d in dirs if fnmatch.fnmatch(d, ignore_)]
+
+            # dirs need to be edited in-place
+            for d in dirs_to_remove:
+                dirs.remove(d)
+
+            files = [f for f in files if not fnmatch.fnmatch(f, ignore_)]
+
+        absolute_paths = [os.path.join(root, f) for f in files]
+        relative_paths = [os.path.relpath(p, dir_path) for p in absolute_paths]
+
+        if add_base_to_relative:
+            relative_paths = [os.path.join(base_name, p) for p in relative_paths]
+
+        assert len(absolute_paths) == len(relative_paths)
+        result += zip(absolute_paths, relative_paths)
+
+    return result
+
+
+def copy_files_and_create_dirs(files: List[Tuple[str, str]]) -> None:
+    """Takes in a list of tuples of (src, dst) paths and copies files.
+    Will create all necessary directories."""
+    for file in files:
+        target_dir_name = os.path.dirname(file[1])
+
+        # will create all intermediate-level directories
+        if not os.path.exists(target_dir_name):
+            os.makedirs(target_dir_name)
+
+        shutil.copyfile(file[0], file[1])
+
+
+# URL helpers
+# ------------------------------------------------------------------------------------------
+
+def is_url(obj: Any, allow_file_urls: bool = False) -> bool:
+    """Determine whether the given object is a valid URL string."""
+    if not isinstance(obj, str) or not "://" in obj:
+        return False
+    if allow_file_urls and obj.startswith('file://'):
+        return True
+    try:
+        res = requests.compat.urlparse(obj)
+        if not res.scheme or not res.netloc or not "." in res.netloc:
+            return False
+        res = requests.compat.urlparse(requests.compat.urljoin(obj, "/"))
+        if not res.scheme or not res.netloc or not "." in res.netloc:
+            return False
+    except:
+        return False
+    return True
+
+
+def open_url(url: str, cache_dir: str = None, num_attempts: int = 10, verbose: bool = True, return_filename: bool = False, cache: bool = True) -> Any:
+    """Download the given URL and return a binary-mode file object to access the data."""
+    assert num_attempts >= 1
+    assert not (return_filename and (not cache))
+
+    # Doesn't look like an URL scheme so interpret it as a local filename.
+    if not re.match('^[a-z]+://', url):
+        return url if return_filename else open(url, "rb")
+
+    # Handle file URLs.  This code handles unusual file:// patterns that
+    # arise on Windows:
+    #
+    # file:///c:/foo.txt
+    #
+    # which would translate to a local '/c:/foo.txt' filename that's
+    # invalid.  Drop the forward slash for such pathnames.
+    #
+    # If you touch this code path, you should test it on both Linux and
+    # Windows.
+    #
+    # Some internet resources suggest using urllib.request.url2pathname() but
+    # but that converts forward slashes to backslashes and this causes
+    # its own set of problems.
+    if url.startswith('file://'):
+        filename = urllib.parse.urlparse(url).path
+        if re.match(r'^/[a-zA-Z]:', filename):
+            filename = filename[1:]
+        return filename if return_filename else open(filename, "rb")
+
+    assert is_url(url)
+
+    # Lookup from cache.
+    if cache_dir is None:
+        cache_dir = make_cache_dir_path('downloads')
+
+    url_md5 = hashlib.md5(url.encode("utf-8")).hexdigest()
+    if cache:
+        cache_files = glob.glob(os.path.join(cache_dir, url_md5 + "_*"))
+        if len(cache_files) == 1:
+            filename = cache_files[0]
+            return filename if return_filename else open(filename, "rb")
+
+    # Download.
+    url_name = None
+    url_data = None
+    with requests.Session() as session:
+        if verbose:
+            print("Downloading %s ..." % url, end="", flush=True)
+        for attempts_left in reversed(range(num_attempts)):
+            try:
+                with session.get(url) as res:
+                    res.raise_for_status()
+                    if len(res.content) == 0:
+                        raise IOError("No data received")
+
+                    if len(res.content) < 8192:
+                        content_str = res.content.decode("utf-8")
+                        if "download_warning" in res.headers.get("Set-Cookie", ""):
+                            links = [html.unescape(link) for link in content_str.split('"') if "export=download" in link]
+                            if len(links) == 1:
+                                url = requests.compat.urljoin(url, links[0])
+                                raise IOError("Google Drive virus checker nag")
+                        if "Google Drive - Quota exceeded" in content_str:
+                            raise IOError("Google Drive download quota exceeded -- please try again later")
+
+                    match = re.search(r'filename="([^"]*)"', res.headers.get("Content-Disposition", ""))
+                    url_name = match[1] if match else url
+                    url_data = res.content
+                    if verbose:
+                        print(" done")
+                    break
+            except KeyboardInterrupt:
+                raise
+            except:
+                if not attempts_left:
+                    if verbose:
+                        print(" failed")
+                    raise
+                if verbose:
+                    print(".", end="", flush=True)
+
+    # Save to cache.
+    if cache:
+        safe_name = re.sub(r"[^0-9a-zA-Z-._]", "_", url_name)
+        cache_file = os.path.join(cache_dir, url_md5 + "_" + safe_name)
+        temp_file = os.path.join(cache_dir, "tmp_" + uuid.uuid4().hex + "_" + url_md5 + "_" + safe_name)
+        os.makedirs(cache_dir, exist_ok=True)
+        with open(temp_file, "wb") as f:
+            f.write(url_data)
+        os.replace(temp_file, cache_file) # atomic
+        if return_filename:
+            return cache_file
+
+    # Return data as file object.
+    assert not return_filename
+    return io.BytesIO(url_data)

models/base_generator.py

@@ -0,0 +1,248 @@
+# python3.7
+"""Contains the base class for generator."""
+
+import os
+import sys
+import logging
+import numpy as np
+
+import torch
+
+from . import model_settings
+
+__all__ = ['BaseGenerator']
+
+
+def get_temp_logger(logger_name='logger'):
+  """Gets a temporary logger.
+
+  This logger will print all levels of messages onto the screen.
+
+  Args:
+    logger_name: Name of the logger.
+
+  Returns:
+    A `logging.Logger`.
+
+  Raises:
+    ValueError: If the input `logger_name` is empty.
+  """
+  if not logger_name:
+    raise ValueError(f'Input `logger_name` should not be empty!')
+
+  logger = logging.getLogger(logger_name)
+  if not logger.hasHandlers():
+    logger.setLevel(logging.DEBUG)
+    formatter = logging.Formatter("[%(asctime)s][%(levelname)s] %(message)s")
+    sh = logging.StreamHandler(stream=sys.stdout)
+    sh.setLevel(logging.DEBUG)
+    sh.setFormatter(formatter)
+    logger.addHandler(sh)
+
+  return logger
+
+
+class BaseGenerator(object):
+  """Base class for generator used in GAN variants.
+
+  NOTE: The model should be defined with pytorch, and only used for inference.
+  """
+
+  def __init__(self, model_name, logger=None):
+    """Initializes with specific settings.
+
+    The model should be registered in `model_settings.py` with proper settings
+    first. Among them, some attributes are necessary, including:
+    (1) gan_type: Type of the GAN model.
+    (2) latent_space_dim: Dimension of the latent space. Should be a tuple.
+    (3) resolution: Resolution of the synthesis.
+    (4) min_val: Minimum value of the raw output. (default -1.0)
+    (5) max_val: Maximum value of the raw output. (default 1.0)
+    (6) channel_order: Channel order of the output image. (default: `RGB`)
+
+    Args:
+      model_name: Name with which the model is registered.
+      logger: Logger for recording log messages. If set as `None`, a default
+        logger, which prints messages from all levels to screen, will be
+        created. (default: None)
+
+    Raises:
+      AttributeError: If some necessary attributes are missing.
+    """
+    self.model_name = model_name
+    for key, val in model_settings.MODEL_POOL[model_name].items():
+      setattr(self, key, val)
+    self.use_cuda = model_settings.USE_CUDA
+    self.batch_size = model_settings.MAX_IMAGES_ON_DEVICE
+    self.logger = logger or get_temp_logger(model_name + '_generator')
+    self.model = None
+    self.run_device = 'cuda' if self.use_cuda else 'cpu'
+    self.cpu_device = 'cpu'
+
+    # Check necessary settings.
+    self.check_attr('gan_type')
+    self.check_attr('latent_space_dim')
+    self.check_attr('resolution')
+    self.min_val = getattr(self, 'min_val', -1.0)
+    self.max_val = getattr(self, 'max_val', 1.0)
+    self.output_channels = getattr(self, 'output_channels', 3)
+    self.channel_order = getattr(self, 'channel_order', 'RGB').upper()
+    assert self.channel_order in ['RGB', 'BGR']
+
+    # Build model and load pre-trained weights.
+    self.build()
+    if os.path.isfile(getattr(self, 'model_path', '')):
+      self.load()
+    elif os.path.isfile(getattr(self, 'tf_model_path', '')):
+      self.convert_tf_model()
+    else:
+      self.logger.warning(f'No pre-trained model will be loaded!')
+
+    # Change to inference mode and GPU mode if needed.
+    assert self.model
+    self.model.eval().to(self.run_device)
+
+  def check_attr(self, attr_name):
+    """Checks the existence of a particular attribute.
+
+    Args:
+      attr_name: Name of the attribute to check.
+
+    Raises:
+      AttributeError: If the target attribute is missing.
+    """
+    if not hasattr(self, attr_name):
+      raise AttributeError(
+          f'`{attr_name}` is missing for model `{self.model_name}`!')
+
+  def build(self):
+    """Builds the graph."""
+    raise NotImplementedError(f'Should be implemented in derived class!')
+
+  def load(self):
+    """Loads pre-trained weights."""
+    raise NotImplementedError(f'Should be implemented in derived class!')
+
+  def convert_tf_model(self, test_num=10):
+    """Converts models weights from tensorflow version.
+
+    Args:
+      test_num: Number of images to generate for testing whether the conversion
+        is done correctly. `0` means skipping the test. (default 10)
+    """
+    raise NotImplementedError(f'Should be implemented in derived class!')
+
+  def sample(self, num):
+    """Samples latent codes randomly.
+
+    Args:
+      num: Number of latent codes to sample. Should be positive.
+
+    Returns:
+      A `numpy.ndarray` as sampled latend codes.
+    """
+    raise NotImplementedError(f'Should be implemented in derived class!')
+
+  def preprocess(self, latent_codes):
+    """Preprocesses the input latent code if needed.
+
+    Args:
+      latent_codes: The input latent codes for preprocessing.
+
+    Returns:
+      The preprocessed latent codes which can be used as final input for the
+        generator.
+    """
+    raise NotImplementedError(f'Should be implemented in derived class!')
+
+  def easy_sample(self, num):
+    """Wraps functions `sample()` and `preprocess()` together."""
+    return self.preprocess(self.sample(num))
+
+  def synthesize(self, latent_codes):
+    """Synthesizes images with given latent codes.
+
+    NOTE: The latent codes should have already been preprocessed.
+
+    Args:
+      latent_codes: Input latent codes for image synthesis.
+
+    Returns:
+      A dictionary whose values are raw outputs from the generator.
+    """
+    raise NotImplementedError(f'Should be implemented in derived class!')
+
+  def get_value(self, tensor):
+    """Gets value of a `torch.Tensor`.
+
+    Args:
+      tensor: The input tensor to get value from.
+
+    Returns:
+      A `numpy.ndarray`.
+
+    Raises:
+      ValueError: If the tensor is with neither `torch.Tensor` type or
+        `numpy.ndarray` type.
+    """
+    if isinstance(tensor, np.ndarray):
+      return tensor
+    if isinstance(tensor, torch.Tensor):
+      return tensor.to(self.cpu_device).detach().numpy()
+    raise ValueError(f'Unsupported input type `{type(tensor)}`!')
+
+  def postprocess(self, images):
+    """Postprocesses the output images if needed.
+
+    This function assumes the input numpy array is with shape [batch_size,
+    channel, height, width]. Here, `channel = 3` for color image and
+    `channel = 1` for grayscale image. The return images are with shape
+    [batch_size, height, width, channel]. NOTE: The channel order of output
+    image will always be `RGB`.
+
+    Args:
+      images: The raw output from the generator.
+
+    Returns:
+      The postprocessed images with dtype `numpy.uint8` with range [0, 255].
+
+    Raises:
+      ValueError: If the input `images` are not with type `numpy.ndarray` or not
+        with shape [batch_size, channel, height, width].
+    """
+    if not isinstance(images, np.ndarray):
+      raise ValueError(f'Images should be with type `numpy.ndarray`!')
+    if ('stylegan3' not in self.model_name) and ('stylegan2' not in self.model_name):
+      images_shape = images.shape
+      if len(images_shape) != 4 or images_shape[1] not in [1, 3]:
+        raise ValueError(f'Input should be with shape [batch_size, channel, '
+                        f'height, width], where channel equals to 1 or 3. '
+                        f'But {images_shape} is received!')
+      images = (images - self.min_val) * 255 / (self.max_val - self.min_val)
+      images = np.clip(images + 0.5, 0, 255).astype(np.uint8)
+      images = images.transpose(0, 2, 3, 1)
+      if self.channel_order == 'BGR':
+        images = images[:, :, :, ::-1]
+
+    return images
+
+  def easy_synthesize(self, latent_codes, **kwargs):
+    """Wraps functions `synthesize()` and `postprocess()` together."""
+    outputs = self.synthesize(latent_codes, **kwargs)
+    if 'image' in outputs:
+      outputs['image'] = self.postprocess(outputs['image'])
+
+    return outputs
+
+  def get_batch_inputs(self, latent_codes):
+    """Gets batch inputs from a collection of latent codes.
+
+    This function will yield at most `self.batch_size` latent_codes at a time.
+
+    Args:
+      latent_codes: The input latent codes for generation. First dimension
+        should be the total number.
+    """
+    total_num = latent_codes.shape[0]
+    for i in range(0, total_num, self.batch_size):
+      yield latent_codes[i:i + self.batch_size]

models/model_settings.py

@@ -0,0 +1,102 @@
+# python3.7
+"""Contains basic configurations for models used in this project.
+
+Please download the public released models from the following two repositories
+OR train your own models, and then put them into `pretrain` folder.
+
+ProgressiveGAN: https://github.com/tkarras/progressive_growing_of_gans
+StyleGAN: https://github.com/NVlabs/stylegan
+StyleGAN:
+
+NOTE: Any new model should be registered in `MODEL_POOL` before using.
+"""
+
+import os.path
+
+BASE_DIR = os.path.dirname(os.path.relpath(__file__))
+
+MODEL_DIR = BASE_DIR + '/pretrain'
+
+MODEL_POOL = {
+    'pggan_celebahq': {
+        'tf_model_path': MODEL_DIR + '/karras2018iclr-celebahq-1024x1024.pkl',
+        'model_path': MODEL_DIR + '/pggan_celebahq.pth',
+        'gan_type': 'pggan',
+        'dataset_name': 'celebahq',
+        'latent_space_dim': 512,
+        'resolution': 1024,
+        'min_val': -1.0,
+        'max_val': 1.0,
+        'output_channels': 3,
+        'channel_order': 'RGB',
+        'fused_scale': False,
+    },
+    'stylegan_celebahq': {
+        'tf_model_path':
+            MODEL_DIR + '/karras2019stylegan-celebahq-1024x1024.pkl',
+        'model_path': MODEL_DIR + '/stylegan_celebahq.pth',
+        'gan_type': 'stylegan',
+        'dataset_name': 'celebahq',
+        'latent_space_dim': 512,
+        'w_space_dim': 512,
+        'resolution': 1024,
+        'min_val': -1.0,
+        'max_val': 1.0,
+        'output_channels': 3,
+        'channel_order': 'RGB',
+        'fused_scale': 'auto',
+    },
+    'stylegan_ffhq': {
+        'tf_model_path': MODEL_DIR + '/karras2019stylegan-ffhq-1024x1024.pkl',
+        'model_path': MODEL_DIR + '/stylegan_ffhq.pth',
+        'gan_type': 'stylegan',
+        'dataset_name': 'ffhq',
+        'latent_space_dim': 512,
+        'w_space_dim': 512,
+        'resolution': 1024,
+        'min_val': -1.0,
+        'max_val': 1.0,
+        'output_channels': 3,
+        'channel_order': 'RGB',
+        'fused_scale': 'auto',
+    },
+    'stylegan2_ffhq': {
+        'tf_model_path': MODEL_DIR + '/karras2019stylegan-ffhq-1024x1024.pkl',
+        'model_path': MODEL_DIR + '/stylegan2-ffhq-1024x1024.pkl',
+        'gan_type': 'stylegan2',
+        'dataset_name': 'ffhq',
+        'latent_space_dim': 512,
+        'w_space_dim': 512,
+        'c_space_dim': 512,
+        'resolution': 1024,
+        'min_val': -1.0,
+        'max_val': 1.0,
+        'output_channels': 3,
+        'channel_order': 'RGB',
+        'fused_scale': 'auto',
+    },
+    'stylegan3_ffhq': {
+        'model_path': MODEL_DIR + '/stylegan3-t-ffhq-1024x1024.pkl',
+        'gan_type': 'stylegan3',
+        'dataset_name': 'ffhq',
+        'latent_space_dim': 512,
+        'w_space_dim': 512,
+        'c_space_dim': 512,
+        'resolution': 1024,
+        'min_val': -1.0,
+        'max_val': 1.0,
+        'output_channels': 3,
+        'channel_order': 'RGB',
+        'fused_scale': 'auto',
+    }, 
+}
+
+# Settings for StyleGAN.
+STYLEGAN_TRUNCATION_PSI = 0.7  # 1.0 means no truncation
+STYLEGAN_TRUNCATION_LAYERS = 8  # 0 means no truncation
+STYLEGAN_RANDOMIZE_NOISE = False
+
+# Settings for model running.
+USE_CUDA = False
+
+MAX_IMAGES_ON_DEVICE = 8

models/pggan_generator.py

@@ -0,0 +1,133 @@
+# python3.7
+"""Contains the generator class of ProgressiveGAN.
+
+Basically, this class is derived from the `BaseGenerator` class defined in
+`base_generator.py`.
+"""
+
+import os
+import numpy as np
+
+import torch
+
+from . import model_settings
+from .pggan_generator_model import PGGANGeneratorModel
+from .base_generator import BaseGenerator
+
+__all__ = ['PGGANGenerator']
+
+
+class PGGANGenerator(BaseGenerator):
+  """Defines the generator class of ProgressiveGAN."""
+
+  def __init__(self, model_name, logger=None):
+    super().__init__(model_name, logger)
+    assert self.gan_type == 'pggan'
+
+  def build(self):
+    self.check_attr('fused_scale')
+    self.model = PGGANGeneratorModel(resolution=self.resolution,
+                                     fused_scale=self.fused_scale,
+                                     output_channels=self.output_channels)
+
+  def load(self):
+    self.logger.info(f'Loading pytorch model from `{self.model_path}`.')
+    self.model.load_state_dict(torch.load(self.model_path))
+    self.logger.info(f'Successfully loaded!')
+    self.lod = self.model.lod.to(self.cpu_device).tolist()
+    self.logger.info(f'  `lod` of the loaded model is {self.lod}.')
+
+  def convert_tf_model(self, test_num=10):
+    import sys
+    import pickle
+    import tensorflow as tf
+    os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2'
+    sys.path.append(model_settings.BASE_DIR + '/pggan_tf_official')
+
+    self.logger.info(f'Loading tensorflow model from `{self.tf_model_path}`.')
+    tf.InteractiveSession()
+    with open(self.tf_model_path, 'rb') as f:
+      _, _, tf_model = pickle.load(f)
+    self.logger.info(f'Successfully loaded!')
+
+    self.logger.info(f'Converting tensorflow model to pytorch version.')
+    tf_vars = dict(tf_model.__getstate__()['variables'])
+    state_dict = self.model.state_dict()
+    for pth_var_name, tf_var_name in self.model.pth_to_tf_var_mapping.items():
+      if 'ToRGB_lod' in tf_var_name:
+        lod = int(tf_var_name[len('ToRGB_lod')])
+        lod_shift = 10 - int(np.log2(self.resolution))
+        tf_var_name = tf_var_name.replace(f'{lod}', f'{lod - lod_shift}')
+      if tf_var_name not in tf_vars:
+        self.logger.debug(f'Variable `{tf_var_name}` does not exist in '
+                          f'tensorflow model.')
+        continue
+      self.logger.debug(f'  Converting `{tf_var_name}` to `{pth_var_name}`.')
+      var = torch.from_numpy(np.array(tf_vars[tf_var_name]))
+      if 'weight' in pth_var_name:
+        if 'layer0.conv' in pth_var_name:
+          var = var.view(var.shape[0], -1, 4, 4).permute(1, 0, 2, 3).flip(2, 3)
+        elif 'Conv0_up' in tf_var_name:
+          var = var.permute(0, 1, 3, 2)
+        else:
+          var = var.permute(3, 2, 0, 1)
+      state_dict[pth_var_name] = var
+    self.logger.info(f'Successfully converted!')
+
+    self.logger.info(f'Saving pytorch model to `{self.model_path}`.')
+    torch.save(state_dict, self.model_path)
+    self.logger.info(f'Successfully saved!')
+
+    self.load()
+
+    # Official tensorflow model can only run on GPU.
+    if test_num <= 0 or not tf.test.is_built_with_cuda():
+      return
+    self.logger.info(f'Testing conversion results.')
+    self.model.eval().to(self.run_device)
+    label_dim = tf_model.input_shapes[1][1]
+    tf_fake_label = np.zeros((1, label_dim), np.float32)
+    total_distance = 0.0
+    for i in range(test_num):
+      latent_code = self.easy_sample(1)
+      tf_output = tf_model.run(latent_code, tf_fake_label)
+      pth_output = self.synthesize(latent_code)['image']
+      distance = np.average(np.abs(tf_output - pth_output))
+      self.logger.debug(f'  Test {i:03d}: distance {distance:.6e}.')
+      total_distance += distance
+    self.logger.info(f'Average distance is {total_distance / test_num:.6e}.')
+
+  def sample(self, num):
+    assert num > 0
+    return np.random.randn(num, self.latent_space_dim).astype(np.float32)
+
+  def preprocess(self, latent_codes):
+    if not isinstance(latent_codes, np.ndarray):
+      raise ValueError(f'Latent codes should be with type `numpy.ndarray`!')
+
+    latent_codes = latent_codes.reshape(-1, self.latent_space_dim)
+    norm = np.linalg.norm(latent_codes, axis=1, keepdims=True)
+    latent_codes = latent_codes / norm * np.sqrt(self.latent_space_dim)
+    return latent_codes.astype(np.float32)
+
+  def synthesize(self, latent_codes):
+    if not isinstance(latent_codes, np.ndarray):
+      raise ValueError(f'Latent codes should be with type `numpy.ndarray`!')
+    latent_codes_shape = latent_codes.shape
+    if not (len(latent_codes_shape) == 2 and
+            latent_codes_shape[0] <= self.batch_size and
+            latent_codes_shape[1] == self.latent_space_dim):
+      raise ValueError(f'Latent_codes should be with shape [batch_size, '
+                       f'latent_space_dim], where `batch_size` no larger than '
+                       f'{self.batch_size}, and `latent_space_dim` equal to '
+                       f'{self.latent_space_dim}!\n'
+                       f'But {latent_codes_shape} received!')
+
+    zs = torch.from_numpy(latent_codes).type(torch.FloatTensor)
+    zs = zs.to(self.run_device)
+    images = self.model(zs)
+    results = {
+        'z': latent_codes,
+        'image': self.get_value(images),
+    }
+    return results

models/pggan_generator_model.py

@@ -0,0 +1,322 @@
+# python3.7
+"""Contains the implementation of generator described in ProgressiveGAN.
+
+Different from the official tensorflow model in folder `pggan_tf_official`, this
+is a simple pytorch version which only contains the generator part. This class
+is specially used for inference.
+
+For more details, please check the original paper:
+https://arxiv.org/pdf/1710.10196.pdf
+"""
+
+import numpy as np
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+__all__ = ['PGGANGeneratorModel']
+
+# Defines a dictionary, which maps the target resolution of the final generated
+# image to numbers of filters used in each convolutional layer in sequence.
+_RESOLUTIONS_TO_CHANNELS = {
+    8: [512, 512, 512],
+    16: [512, 512, 512, 512],
+    32: [512, 512, 512, 512, 512],
+    64: [512, 512, 512, 512, 512, 256],
+    128: [512, 512, 512, 512, 512, 256, 128],
+    256: [512, 512, 512, 512, 512, 256, 128, 64],
+    512: [512, 512, 512, 512, 512, 256, 128, 64, 32],
+    1024: [512, 512, 512, 512, 512, 256, 128, 64, 32, 16],
+}
+
+# Variable mapping from pytorch model to official tensorflow model.
+_PGGAN_PTH_VARS_TO_TF_VARS = {
+    'lod': 'lod',  # []
+    'layer0.conv.weight': '4x4/Dense/weight',  # [512, 512, 4, 4]
+    'layer0.wscale.bias': '4x4/Dense/bias',  # [512]
+    'layer1.conv.weight': '4x4/Conv/weight',  # [512, 512, 3, 3]
+    'layer1.wscale.bias': '4x4/Conv/bias',  # [512]
+    'layer2.conv.weight': '8x8/Conv0/weight',  # [512, 512, 3, 3]
+    'layer2.wscale.bias': '8x8/Conv0/bias',  # [512]
+    'layer3.conv.weight': '8x8/Conv1/weight',  # [512, 512, 3, 3]
+    'layer3.wscale.bias': '8x8/Conv1/bias',  # [512]
+    'layer4.conv.weight': '16x16/Conv0/weight',  # [512, 512, 3, 3]
+    'layer4.wscale.bias': '16x16/Conv0/bias',  # [512]
+    'layer5.conv.weight': '16x16/Conv1/weight',  # [512, 512, 3, 3]
+    'layer5.wscale.bias': '16x16/Conv1/bias',  # [512]
+    'layer6.conv.weight': '32x32/Conv0/weight',  # [512, 512, 3, 3]
+    'layer6.wscale.bias': '32x32/Conv0/bias',  # [512]
+    'layer7.conv.weight': '32x32/Conv1/weight',  # [512, 512, 3, 3]
+    'layer7.wscale.bias': '32x32/Conv1/bias',  # [512]
+    'layer8.conv.weight': '64x64/Conv0/weight',  # [256, 512, 3, 3]
+    'layer8.wscale.bias': '64x64/Conv0/bias',  # [256]
+    'layer9.conv.weight': '64x64/Conv1/weight',  # [256, 256, 3, 3]
+    'layer9.wscale.bias': '64x64/Conv1/bias',  # [256]
+    'layer10.conv.weight': '128x128/Conv0/weight',  # [128, 256, 3, 3]
+    'layer10.wscale.bias': '128x128/Conv0/bias',  # [128]
+    'layer11.conv.weight': '128x128/Conv1/weight',  # [128, 128, 3, 3]
+    'layer11.wscale.bias': '128x128/Conv1/bias',  # [128]
+    'layer12.conv.weight': '256x256/Conv0/weight',  # [64, 128, 3, 3]
+    'layer12.wscale.bias': '256x256/Conv0/bias',  # [64]
+    'layer13.conv.weight': '256x256/Conv1/weight',  # [64, 64, 3, 3]
+    'layer13.wscale.bias': '256x256/Conv1/bias',  # [64]
+    'layer14.conv.weight': '512x512/Conv0/weight',  # [32, 64, 3, 3]
+    'layer14.wscale.bias': '512x512/Conv0/bias',  # [32]
+    'layer15.conv.weight': '512x512/Conv1/weight',  # [32, 32, 3, 3]
+    'layer15.wscale.bias': '512x512/Conv1/bias',  # [32]
+    'layer16.conv.weight': '1024x1024/Conv0/weight',  # [16, 32, 3, 3]
+    'layer16.wscale.bias': '1024x1024/Conv0/bias',  # [16]
+    'layer17.conv.weight': '1024x1024/Conv1/weight',  # [16, 16, 3, 3]
+    'layer17.wscale.bias': '1024x1024/Conv1/bias',  # [16]
+    'output0.conv.weight': 'ToRGB_lod8/weight',  # [3, 512, 1, 1]
+    'output0.wscale.bias': 'ToRGB_lod8/bias',  # [3]
+    'output1.conv.weight': 'ToRGB_lod7/weight',  # [3, 512, 1, 1]
+    'output1.wscale.bias': 'ToRGB_lod7/bias',  # [3]
+    'output2.conv.weight': 'ToRGB_lod6/weight',  # [3, 512, 1, 1]
+    'output2.wscale.bias': 'ToRGB_lod6/bias',  # [3]
+    'output3.conv.weight': 'ToRGB_lod5/weight',  # [3, 512, 1, 1]
+    'output3.wscale.bias': 'ToRGB_lod5/bias',  # [3]
+    'output4.conv.weight': 'ToRGB_lod4/weight',  # [3, 256, 1, 1]
+    'output4.wscale.bias': 'ToRGB_lod4/bias',  # [3]
+    'output5.conv.weight': 'ToRGB_lod3/weight',  # [3, 128, 1, 1]
+    'output5.wscale.bias': 'ToRGB_lod3/bias',  # [3]
+    'output6.conv.weight': 'ToRGB_lod2/weight',  # [3, 64, 1, 1]
+    'output6.wscale.bias': 'ToRGB_lod2/bias',  # [3]
+    'output7.conv.weight': 'ToRGB_lod1/weight',  # [3, 32, 1, 1]
+    'output7.wscale.bias': 'ToRGB_lod1/bias',  # [3]
+    'output8.conv.weight': 'ToRGB_lod0/weight',  # [3, 16, 1, 1]
+    'output8.wscale.bias': 'ToRGB_lod0/bias',  # [3]
+}
+
+
+class PGGANGeneratorModel(nn.Module):
+  """Defines the generator module in ProgressiveGAN.
+
+  Note that the generated images are with RGB color channels with range [-1, 1].
+  """
+
+  def __init__(self,
+               resolution=1024,
+               fused_scale=False,
+               output_channels=3):
+    """Initializes the generator with basic settings.
+
+    Args:
+      resolution: The resolution of the final output image. (default: 1024)
+      fused_scale: Whether to fused `upsample` and `conv2d` together, resulting
+        in `conv2_transpose`. (default: False)
+      output_channels: Number of channels of the output image. (default: 3)
+
+    Raises:
+      ValueError: If the input `resolution` is not supported.
+    """
+    super().__init__()
+
+    try:
+      self.channels = _RESOLUTIONS_TO_CHANNELS[resolution]
+    except KeyError:
+      raise ValueError(f'Invalid resolution: {resolution}!\n'
+                       f'Resolutions allowed: '
+                       f'{list(_RESOLUTIONS_TO_CHANNELS)}.')
+    assert len(self.channels) == int(np.log2(resolution))
+
+    self.resolution = resolution
+    self.fused_scale = fused_scale
+    self.output_channels = output_channels
+
+    for block_idx in range(1, len(self.channels)):
+      if block_idx == 1:
+        self.add_module(
+            f'layer{2 * block_idx - 2}',
+            ConvBlock(in_channels=self.channels[block_idx - 1],
+                      out_channels=self.channels[block_idx],
+                      kernel_size=4,
+                      padding=3))
+      else:
+        self.add_module(
+            f'layer{2 * block_idx - 2}',
+            ConvBlock(in_channels=self.channels[block_idx - 1],
+                      out_channels=self.channels[block_idx],
+                      upsample=True,
+                      fused_scale=self.fused_scale))
+      self.add_module(
+          f'layer{2 * block_idx - 1}',
+          ConvBlock(in_channels=self.channels[block_idx],
+                    out_channels=self.channels[block_idx]))
+      self.add_module(
+          f'output{block_idx - 1}',
+          ConvBlock(in_channels=self.channels[block_idx],
+                    out_channels=self.output_channels,
+                    kernel_size=1,
+                    padding=0,
+                    wscale_gain=1.0,
+                    activation_type='linear'))
+
+    self.upsample = ResolutionScalingLayer()
+    self.lod = nn.Parameter(torch.zeros(()))
+
+    self.pth_to_tf_var_mapping = {}
+    for pth_var_name, tf_var_name in _PGGAN_PTH_VARS_TO_TF_VARS.items():
+      if self.fused_scale and 'Conv0' in tf_var_name:
+        pth_var_name = pth_var_name.replace('conv.weight', 'weight')
+        tf_var_name = tf_var_name.replace('Conv0', 'Conv0_up')
+      self.pth_to_tf_var_mapping[pth_var_name] = tf_var_name
+
+  def forward(self, x):
+    if len(x.shape) != 2:
+      raise ValueError(f'The input tensor should be with shape [batch_size, '
+                       f'noise_dim], but {x.shape} received!')
+    x = x.view(x.shape[0], x.shape[1], 1, 1)
+
+    lod = self.lod.cpu().tolist()
+    for block_idx in range(1, len(self.channels)):
+      if block_idx + lod < len(self.channels):
+        x = self.__getattr__(f'layer{2 * block_idx - 2}')(x)
+        x = self.__getattr__(f'layer{2 * block_idx - 1}')(x)
+        image = self.__getattr__(f'output{block_idx - 1}')(x)
+      else:
+        image = self.upsample(image)
+    return image
+
+
+class PixelNormLayer(nn.Module):
+  """Implements pixel-wise feature vector normalization layer."""
+
+  def __init__(self, epsilon=1e-8):
+    super().__init__()
+    self.epsilon = epsilon
+
+  def forward(self, x):
+    return x / torch.sqrt(torch.mean(x**2, dim=1, keepdim=True) + self.epsilon)
+
+
+class ResolutionScalingLayer(nn.Module):
+  """Implements the resolution scaling layer.
+
+  Basically, this layer can be used to upsample or downsample feature maps from
+  spatial domain with nearest neighbor interpolation.
+  """
+
+  def __init__(self, scale_factor=2):
+    super().__init__()
+    self.scale_factor = scale_factor
+
+  def forward(self, x):
+    return F.interpolate(x, scale_factor=self.scale_factor, mode='nearest')
+
+
+class WScaleLayer(nn.Module):
+  """Implements the layer to scale weight variable and add bias.
+
+  Note that, the weight variable is trained in `nn.Conv2d` layer, and only
+  scaled with a constant number, which is not trainable, in this layer. However,
+  the bias variable is trainable in this layer.
+  """
+
+  def __init__(self, in_channels, out_channels, kernel_size, gain=np.sqrt(2.0)):
+    super().__init__()
+    fan_in = in_channels * kernel_size * kernel_size
+    self.scale = gain / np.sqrt(fan_in)
+    self.bias = nn.Parameter(torch.zeros(out_channels))
+
+  def forward(self, x):
+    return x * self.scale + self.bias.view(1, -1, 1, 1)
+
+
+class ConvBlock(nn.Module):
+  """Implements the convolutional block used in ProgressiveGAN.
+
+  Basically, this block executes pixel-wise normalization layer, upsampling
+  layer (if needed), convolutional layer, weight-scale layer, and activation
+  layer in sequence.
+  """
+
+  def __init__(self,
+               in_channels,
+               out_channels,
+               kernel_size=3,
+               stride=1,
+               padding=1,
+               dilation=1,
+               add_bias=False,
+               upsample=False,
+               fused_scale=False,
+               wscale_gain=np.sqrt(2.0),
+               activation_type='lrelu'):
+    """Initializes the class with block settings.
+
+    Args:
+      in_channels: Number of channels of the input tensor fed into this block.
+      out_channels: Number of channels (kernels) of the output tensor.
+      kernel_size: Size of the convolutional kernel.
+      stride: Stride parameter for convolution operation.
+      padding: Padding parameter for convolution operation.
+      dilation: Dilation rate for convolution operation.
+      add_bias: Whether to add bias onto the convolutional result.
+      upsample: Whether to upsample the input tensor before convolution.
+      fused_scale: Whether to fused `upsample` and `conv2d` together, resulting
+        in `conv2_transpose`.
+      wscale_gain: The gain factor for `wscale` layer.
+      wscale_lr_multiplier: The learning rate multiplier factor for `wscale`
+        layer.
+      activation_type: Type of activation function. Support `linear`, `lrelu`
+        and `tanh`.
+
+    Raises:
+      NotImplementedError: If the input `activation_type` is not supported.
+    """
+    super().__init__()
+    self.pixel_norm = PixelNormLayer()
+
+    if upsample and not fused_scale:
+      self.upsample = ResolutionScalingLayer()
+    else:
+      self.upsample = nn.Identity()
+
+    if upsample and fused_scale:
+      self.weight = nn.Parameter(
+          torch.randn(kernel_size, kernel_size, in_channels, out_channels))
+      fan_in = in_channels * kernel_size * kernel_size
+      self.scale = wscale_gain / np.sqrt(fan_in)
+    else:
+      self.conv = nn.Conv2d(in_channels=in_channels,
+                            out_channels=out_channels,
+                            kernel_size=kernel_size,
+                            stride=stride,
+                            padding=padding,
+                            dilation=dilation,
+                            groups=1,
+                            bias=add_bias)
+
+    self.wscale = WScaleLayer(in_channels=in_channels,
+                              out_channels=out_channels,
+                              kernel_size=kernel_size,
+                              gain=wscale_gain)
+
+    if activation_type == 'linear':
+      self.activate = nn.Identity()
+    elif activation_type == 'lrelu':
+      self.activate = nn.LeakyReLU(negative_slope=0.2, inplace=True)
+    elif activation_type == 'tanh':
+      self.activate = nn.Hardtanh()
+    else:
+      raise NotImplementedError(f'Not implemented activation function: '
+                                f'{activation_type}!')
+
+  def forward(self, x):
+    x = self.pixel_norm(x)
+    x = self.upsample(x)
+    if hasattr(self, 'conv'):
+      x = self.conv(x)
+    else:
+      kernel = self.weight * self.scale
+      kernel = F.pad(kernel, (0, 0, 0, 0, 1, 1, 1, 1), 'constant', 0.0)
+      kernel = (kernel[1:, 1:] + kernel[:-1, 1:] +
+                kernel[1:, :-1] + kernel[:-1, :-1])
+      kernel = kernel.permute(2, 3, 0, 1)
+      x = F.conv_transpose2d(x, kernel, stride=2, padding=1)
+      x = x / self.scale
+    x = self.wscale(x)
+    x = self.activate(x)
+    return x

models/pggan_tf_official/LICENSE.txt

@@ -0,0 +1,410 @@
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models/pggan_tf_official/README.md

@@ -0,0 +1,174 @@
+## Progressive Growing of GANs for Improved Quality, Stability, and Variation<br><i>� Official TensorFlow implementation of the ICLR 2018 paper</i>
+
+**Tero Karras** (NVIDIA), **Timo Aila** (NVIDIA), **Samuli Laine** (NVIDIA), **Jaakko Lehtinen** (NVIDIA and Aalto University)
+
+* For business inquiries, please contact **[[email protected]](mailto:[email protected])**
+* For press and other inquiries, please contact Hector Marinez at **[[email protected]](mailto:[email protected])**
+
+![Representative image](https://raw.githubusercontent.com/tkarras/progressive_growing_of_gans/master/representative_image_512x256.png)<br>
+**Picture:** Two imaginary celebrities that were dreamed up by a random number generator.
+
+**Abstract:**<br>
+*We describe a new training methodology for generative adversarial networks. The key idea is to grow both the generator and discriminator progressively: starting from a low resolution, we add new layers that model increasingly fine details as training progresses. This both speeds the training up and greatly stabilizes it, allowing us to produce images of unprecedented quality, e.g., CelebA images at 1024�. We also propose a simple way to increase the variation in generated images, and achieve a record inception score of 8.80 in unsupervised CIFAR10. Additionally, we describe several implementation details that are important for discouraging unhealthy competition between the generator and discriminator. Finally, we suggest a new metric for evaluating GAN results, both in terms of image quality and variation. As an additional contribution, we construct a higher-quality version of the CelebA dataset.*
+
+## Resources
+
+* [Paper (NVIDIA research)](http://research.nvidia.com/publication/2017-10_Progressive-Growing-of)
+* [Paper (arXiv)](http://arxiv.org/abs/1710.10196)
+* [Result video (YouTube)](https://youtu.be/G06dEcZ-QTg)
+* [Additional material (Google Drive)](https://drive.google.com/open?id=0B4qLcYyJmiz0NHFULTdYc05lX0U)
+  * [ICLR 2018 poster (`karras2018iclr-poster.pdf`)](https://drive.google.com/open?id=1ilUVoIejsvG04G0PzFNVn3U3TjSSyHGu)
+  * [ICLR 2018 slides (`karras2018iclr-slides.pptx`)](https://drive.google.com/open?id=1jYlrX4DgTs2VAfRcyl3pcNI4ONkBg3-g)
+  * [Representative images (`images/representative-images`)](https://drive.google.com/open?id=0B4qLcYyJmiz0UE9zVHduWFVORlk)
+  * [High-quality video clips (`videos/high-quality-video-clips`)](https://drive.google.com/open?id=1gQu3O8ZhC-nko8wLFgcNqcwMnRYL_z85)
+  * [Huge collection of non-curated images for each dataset (`images/100k-generated-images`)](https://drive.google.com/open?id=1j6uZ_a6zci0HyKZdpDq9kSa8VihtEPCp)
+  * [Extensive video of random interpolations for each dataset (`videos/one-hour-of-random-interpolations`)](https://drive.google.com/open?id=1gAb3oqpaQFHZTwPUXHPIfBIP8eIeWNrI)
+  * [Pre-trained networks (`networks/tensorflow-version`)](https://drive.google.com/open?id=15hvzxt_XxuokSmj0uO4xxMTMWVc0cIMU)
+  * [Minimal example script for importing the pre-trained networks (`networks/tensorflow-version/example_import_script`)](https://drive.google.com/open?id=1A79qKDTFp6pExe4gTSgBsEOkxwa2oes_)
+  * [Data files needed to reconstruct the CelebA-HQ dataset (`datasets/celeba-hq-deltas`)](https://drive.google.com/open?id=0B4qLcYyJmiz0TXY1NG02bzZVRGs)
+  * [Example training logs and progress snapshots (`networks/tensorflow-version/example_training_runs`)](https://drive.google.com/open?id=1A9SKoQ7Xu2fqK22GHdMw8LZTh6qLvR7H)
+
+All the material, including source code, is made freely available for non-commercial use under the Creative Commons [CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/legalcode) license. Feel free to use any of the material in your own work, as long as you give us appropriate credit by mentioning the title and author list of our paper.
+
+## Versions
+
+There are two different versions of the source code. The *TensorFlow version* is newer and more polished, and we generally recommend it as a starting point if you are looking to experiment with our technique, build upon it, or apply it to novel datasets. The *original Theano version*, on the other hand, is what we used to produce all the results shown in our paper. We recommend using it if � and only if � you are looking to reproduce our exact results for benchmark datasets like CIFAR-10, MNIST-RGB, and CelebA.
+
+The main differences are summarized in the following table:
+
+| Feature                           | TensorFlow version                            | Original Theano version   |
+| :-------------------------------- | :-------------------------------------------: | :-----------------------: |
+| Branch                            | [master](https://github.com/tkarras/progressive_growing_of_gans/tree/master) (this branch) | [original-theano-version](https://github.com/tkarras/progressive_growing_of_gans/tree/original-theano-version) |
+| Multi-GPU support                 | Yes                                           | No                        |
+| FP16 mixed-precision support      | Yes                                           | No                        |
+| Performance                       | High                                          | Low                       |
+| Training time for CelebA-HQ       | 2 days (8 GPUs)<br>2 weeks (1 GPU)            | 1�2 months                |
+| Repro CelebA-HQ results           | Yes � very close                              | Yes � identical           |
+| Repro LSUN results                | Yes � very close                              | Yes � identical           |
+| Repro CIFAR-10 results            | No                                            | Yes � identical           |
+| Repro MNIST mode recovery         | No                                            | Yes � identical           |
+| Repro ablation study (Table 1)    | No                                            | Yes � identical           |
+| Dataset format                    | TFRecords                                     | HDF5                      |
+| Backwards compatibility           | Can import networks<br>trained with Theano    | N/A                       |
+| Code quality                      | Reasonable                                    | Somewhat messy            |
+| Code status                       | In active use                                 | No longer maintained      |
+
+## System requirements
+
+* Both Linux and Windows are supported, but we strongly recommend Linux for performance and compatibility reasons.
+* 64-bit Python 3.6 installation with numpy 1.13.3 or newer. We recommend Anaconda3.
+* One or more high-end NVIDIA Pascal or Volta GPUs with 16GB of DRAM. We recommend NVIDIA DGX-1 with 8 Tesla V100 GPUs.
+* NVIDIA driver 391.25 or newer, CUDA toolkit 9.0 or newer, cuDNN 7.1.2 or newer.
+* Additional Python packages listed in `requirements-pip.txt`
+
+## Importing and using pre-trained networks
+
+All pre-trained networks found on Google Drive, as well as ones produced by the training script, are stored as Python PKL files. They can be imported using the standard `pickle` mechanism as long as two conditions are met: (1) The directory containing the Progressive GAN code repository must be included in the PYTHONPATH environment variable, and (2) a `tf.Session()` object must have been created beforehand and set as default. Each PKL file contains 3 instances of `tfutil.Network`:
+
+```
+# Import official CelebA-HQ networks.
+with open('karras2018iclr-celebahq-1024x1024.pkl', 'rb') as file:
+    G, D, Gs = pickle.load(file)
+    # G = Instantaneous snapshot of the generator, mainly useful for resuming a previous training run.
+    # D = Instantaneous snapshot of the discriminator, mainly useful for resuming a previous training run.
+    # Gs = Long-term average of the generator, yielding higher-quality results than the instantaneous snapshot.
+```
+
+It is also possible to import networks that were produced using the Theano implementation, as long as they do not employ any features that are not natively supported by the TensorFlow version (minibatch discrimination, batch normalization, etc.). To enable Theano network import, however, you must use `misc.load_pkl()` in place of `pickle.load()`:
+
+```
+# Import Theano versions of the official CelebA-HQ networks.
+import misc
+G, D, Gs = misc.load_pkl('200-celebahq-1024x1024/network-final.pkl')
+```
+
+Once you have imported the networks, you can call `Gs.run()` to produce a set of images for given latent vectors, or `Gs.get_output_for()` to include the generator network in a larger TensorFlow expression. For further details, please consult the example script found on Google Drive. Instructions:
+
+1. Pull the Progressive GAN code repository and add it to your PYTHONPATH environment variable.
+2. Install the required Python packages with `pip install -r requirements-pip.txt`
+2. Download [`import_example.py`](https://drive.google.com/open?id=1xZul7DwqqJoe5OCuKHw6fQVeQZNIMSuF) from [`networks/tensorflow-version/example_import_script`](https://drive.google.com/open?id=1A79qKDTFp6pExe4gTSgBsEOkxwa2oes_)
+3. Download [`karras2018iclr-celebahq-1024x1024.pkl`](https://drive.google.com/open?id=188K19ucknC6wg1R6jbuPEhTq9zoufOx4) from [`networks/tensorflow-version`](https://drive.google.com/open?id=15hvzxt_XxuokSmj0uO4xxMTMWVc0cIMU) and place it in the same directory as the script.
+5. Run the script with `python import_example.py`
+6. If everything goes well, the script should generate 10 PNG images (`img0.png` � `img9.png`) that match the ones found in [`networks/tensorflow-version/example_import_script`](https://drive.google.com/open?id=1A79qKDTFp6pExe4gTSgBsEOkxwa2oes_) exactly.
+
+## Preparing datasets for training
+
+The Progressive GAN code repository contains a command-line tool for recreating bit-exact replicas of the datasets that we used in the paper. The tool also provides various utilities for operating on the datasets:
+
+```
+usage: dataset_tool.py [-h] <command> ...
+
+    display             Display images in dataset.
+    extract             Extract images from dataset.
+    compare             Compare two datasets.
+    create_mnist        Create dataset for MNIST.
+    create_mnistrgb     Create dataset for MNIST-RGB.
+    create_cifar10      Create dataset for CIFAR-10.
+    create_cifar100     Create dataset for CIFAR-100.
+    create_svhn         Create dataset for SVHN.
+    create_lsun         Create dataset for single LSUN category.
+    create_celeba       Create dataset for CelebA.
+    create_celebahq     Create dataset for CelebA-HQ.
+    create_from_images  Create dataset from a directory full of images.
+    create_from_hdf5    Create dataset from legacy HDF5 archive.
+
+Type "dataset_tool.py <command> -h" for more information.
+```
+
+The datasets are represented by directories containing the same image data in several resolutions to enable efficient streaming. There is a separate `*.tfrecords` file for each resolution, and if the dataset contains labels, they are stored in a separate file as well:
+
+```
+> python dataset_tool.py create_cifar10 datasets/cifar10 ~/downloads/cifar10
+> ls -la datasets/cifar10
+drwxr-xr-x  2 user user         7 Feb 21 10:07 .
+drwxrwxr-x 10 user user        62 Apr  3 15:10 ..
+-rw-r--r--  1 user user   4900000 Feb 19 13:17 cifar10-r02.tfrecords
+-rw-r--r--  1 user user  12350000 Feb 19 13:17 cifar10-r03.tfrecords
+-rw-r--r--  1 user user  41150000 Feb 19 13:17 cifar10-r04.tfrecords
+-rw-r--r--  1 user user 156350000 Feb 19 13:17 cifar10-r05.tfrecords
+-rw-r--r--  1 user user   2000080 Feb 19 13:17 cifar10-rxx.labels
+```
+
+The ```create_*``` commands take the standard version of a given dataset as input and produce the corresponding `*.tfrecords` files as output. Additionally, the ```create_celebahq``` command requires a set of data files representing deltas with respect to the original CelebA dataset. These deltas (27.6GB) can be downloaded from [`datasets/celeba-hq-deltas`](https://drive.google.com/open?id=0B4qLcYyJmiz0TXY1NG02bzZVRGs).
+
+**Note about module versions**: Some of the dataset commands require specific versions of Python modules and system libraries (e.g. pillow, libjpeg), and they will give an error if the versions do not match. Please heed the error messages � there is **no way** to get the commands to work other than installing these specific versions.
+
+## Training networks
+
+Once the necessary datasets are set up, you can proceed to train your own networks. The general procedure is as follows:
+
+1. Edit `config.py` to specify the dataset and training configuration by uncommenting/editing specific lines.
+2. Run the training script with `python train.py`.
+3. The results are written into a newly created subdirectory under `config.result_dir`
+4. Wait several days (or weeks) for the training to converge, and analyze the results.
+
+By default, `config.py` is configured to train a 1024x1024 network for CelebA-HQ using a single-GPU. This is expected to take about two weeks even on the highest-end NVIDIA GPUs. The key to enabling faster training is to employ multiple GPUs and/or go for a lower-resolution dataset. To this end, `config.py` contains several examples for commonly used datasets, as well as a set of "configuration presets" for multi-GPU training. All of the presets are expected to yield roughly the same image quality for CelebA-HQ, but their total training time can vary considerably:
+
+* `preset-v1-1gpu`: Original config that was used to produce the CelebA-HQ and LSUN results shown in the paper. Expected to take about 1 month on NVIDIA Tesla V100.
+* `preset-v2-1gpu`: Optimized config that converges considerably faster than the original one. Expected to take about 2 weeks on 1xV100.
+* `preset-v2-2gpus`: Optimized config for 2 GPUs. Takes about 1 week on 2xV100.
+* `preset-v2-4gpus`: Optimized config for 4 GPUs. Takes about 3 days on 4xV100.
+* `preset-v2-8gpus`: Optimized config for 8 GPUs. Takes about 2 days on 8xV100.
+
+For reference, the expected output of each configuration preset for CelebA-HQ can be found in [`networks/tensorflow-version/example_training_runs`](https://drive.google.com/open?id=1A9SKoQ7Xu2fqK22GHdMw8LZTh6qLvR7H)
+
+Other noteworthy config options:
+
+* `fp16`: Enable [FP16 mixed-precision training](http://docs.nvidia.com/deeplearning/sdk/mixed-precision-training/index.html) to reduce the training times even further. The actual speedup is heavily dependent on GPU architecture and cuDNN version, and it can be expected to increase considerably in the future.
+* `BENCHMARK`: Quickly iterate through the resolutions to measure the raw training performance.
+* `BENCHMARK0`: Same as `BENCHMARK`, but only use the highest resolution.
+* `syn1024rgb`: Synthetic 1024x1024 dataset consisting of just black images. Useful for benchmarking.
+* `VERBOSE`: Save image and network snapshots very frequently to facilitate debugging.
+* `GRAPH` and `HIST`: Include additional data in the TensorBoard report.
+
+## Analyzing results
+
+Training results can be analyzed in several ways:
+
+* **Manual inspection**: The training script saves a snapshot of randomly generated images at regular intervals in `fakes*.png` and reports the overall progress in `log.txt`.
+* **TensorBoard**: The training script also exports various running statistics in a `*.tfevents` file that can be visualized in TensorBoard with `tensorboard --logdir <result_subdir>`.
+* **Generating images and videos**: At the end of `config.py`, there are several pre-defined configs to launch utility scripts (`generate_*`). For example:
+  * Suppose you have an ongoing training run titled `010-pgan-celebahq-preset-v1-1gpu-fp32`, and you want to generate a video of random interpolations for the latest snapshot.
+  * Uncomment the `generate_interpolation_video` line in `config.py`, replace `run_id=10`, and run `python train.py`
+  * The script will automatically locate the latest network snapshot and create a new result directory containing a single MP4 file.
+* **Quality metrics**: Similar to the previous example, `config.py` also contains pre-defined configs to compute various quality metrics (Sliced Wasserstein distance, Fr�chet inception distance, etc.) for an existing training run. The metrics are computed for each network snapshot in succession and stored in `metric-*.txt` in the original result directory.

models/pggan_tf_official/config.py

@@ -0,0 +1,140 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+#----------------------------------------------------------------------------
+# Convenience class that behaves exactly like dict(), but allows accessing
+# the keys and values using the attribute syntax, i.e., "mydict.key = value".
+
+class EasyDict(dict):
+    def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs)
+    def __getattr__(self, name): return self[name]
+    def __setattr__(self, name, value): self[name] = value
+    def __delattr__(self, name): del self[name]
+
+#----------------------------------------------------------------------------
+# Paths.
+
+data_dir = 'datasets'
+result_dir = 'results'
+
+#----------------------------------------------------------------------------
+# TensorFlow options.
+
+tf_config = EasyDict()  # TensorFlow session config, set by tfutil.init_tf().
+env = EasyDict()        # Environment variables, set by the main program in train.py.
+
+tf_config['graph_options.place_pruned_graph']   = True      # False (default) = Check that all ops are available on the designated device. True = Skip the check for ops that are not used.
+#tf_config['gpu_options.allow_growth']          = False     # False (default) = Allocate all GPU memory at the beginning. True = Allocate only as much GPU memory as needed.
+#env.CUDA_VISIBLE_DEVICES                       = '0'       # Unspecified (default) = Use all available GPUs. List of ints = CUDA device numbers to use.
+env.TF_CPP_MIN_LOG_LEVEL                        = '1'       # 0 (default) = Print all available debug info from TensorFlow. 1 = Print warnings and errors, but disable debug info.
+
+#----------------------------------------------------------------------------
+# Official training configs, targeted mainly for CelebA-HQ.
+# To run, comment/uncomment the lines as appropriate and launch train.py.
+
+desc        = 'pgan'                                        # Description string included in result subdir name.
+random_seed = 1000                                          # Global random seed.
+dataset     = EasyDict()                                    # Options for dataset.load_dataset().
+train       = EasyDict(func='train.train_progressive_gan')  # Options for main training func.
+G           = EasyDict(func='networks.G_paper')             # Options for generator network.
+D           = EasyDict(func='networks.D_paper')             # Options for discriminator network.
+G_opt       = EasyDict(beta1=0.0, beta2=0.99, epsilon=1e-8) # Options for generator optimizer.
+D_opt       = EasyDict(beta1=0.0, beta2=0.99, epsilon=1e-8) # Options for discriminator optimizer.
+G_loss      = EasyDict(func='loss.G_wgan_acgan')            # Options for generator loss.
+D_loss      = EasyDict(func='loss.D_wgangp_acgan')          # Options for discriminator loss.
+sched       = EasyDict()                                    # Options for train.TrainingSchedule.
+grid        = EasyDict(size='1080p', layout='random')       # Options for train.setup_snapshot_image_grid().
+
+# Dataset (choose one).
+desc += '-celebahq';            dataset = EasyDict(tfrecord_dir='celebahq'); train.mirror_augment = True
+#desc += '-celeba';              dataset = EasyDict(tfrecord_dir='celeba'); train.mirror_augment = True
+#desc += '-cifar10';             dataset = EasyDict(tfrecord_dir='cifar10')
+#desc += '-cifar100';            dataset = EasyDict(tfrecord_dir='cifar100')
+#desc += '-svhn';                dataset = EasyDict(tfrecord_dir='svhn')
+#desc += '-mnist';               dataset = EasyDict(tfrecord_dir='mnist')
+#desc += '-mnistrgb';            dataset = EasyDict(tfrecord_dir='mnistrgb')
+#desc += '-syn1024rgb';          dataset = EasyDict(class_name='dataset.SyntheticDataset', resolution=1024, num_channels=3)
+#desc += '-lsun-airplane';       dataset = EasyDict(tfrecord_dir='lsun-airplane-100k');       train.mirror_augment = True
+#desc += '-lsun-bedroom';        dataset = EasyDict(tfrecord_dir='lsun-bedroom-100k');        train.mirror_augment = True
+#desc += '-lsun-bicycle';        dataset = EasyDict(tfrecord_dir='lsun-bicycle-100k');        train.mirror_augment = True
+#desc += '-lsun-bird';           dataset = EasyDict(tfrecord_dir='lsun-bird-100k');           train.mirror_augment = True
+#desc += '-lsun-boat';           dataset = EasyDict(tfrecord_dir='lsun-boat-100k');           train.mirror_augment = True
+#desc += '-lsun-bottle';         dataset = EasyDict(tfrecord_dir='lsun-bottle-100k');         train.mirror_augment = True
+#desc += '-lsun-bridge';         dataset = EasyDict(tfrecord_dir='lsun-bridge-100k');         train.mirror_augment = True
+#desc += '-lsun-bus';            dataset = EasyDict(tfrecord_dir='lsun-bus-100k');            train.mirror_augment = True
+#desc += '-lsun-car';            dataset = EasyDict(tfrecord_dir='lsun-car-100k');            train.mirror_augment = True
+#desc += '-lsun-cat';            dataset = EasyDict(tfrecord_dir='lsun-cat-100k');            train.mirror_augment = True
+#desc += '-lsun-chair';          dataset = EasyDict(tfrecord_dir='lsun-chair-100k');          train.mirror_augment = True
+#desc += '-lsun-churchoutdoor';  dataset = EasyDict(tfrecord_dir='lsun-churchoutdoor-100k');  train.mirror_augment = True
+#desc += '-lsun-classroom';      dataset = EasyDict(tfrecord_dir='lsun-classroom-100k');      train.mirror_augment = True
+#desc += '-lsun-conferenceroom'; dataset = EasyDict(tfrecord_dir='lsun-conferenceroom-100k'); train.mirror_augment = True
+#desc += '-lsun-cow';            dataset = EasyDict(tfrecord_dir='lsun-cow-100k');            train.mirror_augment = True
+#desc += '-lsun-diningroom';     dataset = EasyDict(tfrecord_dir='lsun-diningroom-100k');     train.mirror_augment = True
+#desc += '-lsun-diningtable';    dataset = EasyDict(tfrecord_dir='lsun-diningtable-100k');    train.mirror_augment = True
+#desc += '-lsun-dog';            dataset = EasyDict(tfrecord_dir='lsun-dog-100k');            train.mirror_augment = True
+#desc += '-lsun-horse';          dataset = EasyDict(tfrecord_dir='lsun-horse-100k');          train.mirror_augment = True
+#desc += '-lsun-kitchen';        dataset = EasyDict(tfrecord_dir='lsun-kitchen-100k');        train.mirror_augment = True
+#desc += '-lsun-livingroom';     dataset = EasyDict(tfrecord_dir='lsun-livingroom-100k');     train.mirror_augment = True
+#desc += '-lsun-motorbike';      dataset = EasyDict(tfrecord_dir='lsun-motorbike-100k');      train.mirror_augment = True
+#desc += '-lsun-person';         dataset = EasyDict(tfrecord_dir='lsun-person-100k');         train.mirror_augment = True
+#desc += '-lsun-pottedplant';    dataset = EasyDict(tfrecord_dir='lsun-pottedplant-100k');    train.mirror_augment = True
+#desc += '-lsun-restaurant';     dataset = EasyDict(tfrecord_dir='lsun-restaurant-100k');     train.mirror_augment = True
+#desc += '-lsun-sheep';          dataset = EasyDict(tfrecord_dir='lsun-sheep-100k');          train.mirror_augment = True
+#desc += '-lsun-sofa';           dataset = EasyDict(tfrecord_dir='lsun-sofa-100k');           train.mirror_augment = True
+#desc += '-lsun-tower';          dataset = EasyDict(tfrecord_dir='lsun-tower-100k');          train.mirror_augment = True
+#desc += '-lsun-train';          dataset = EasyDict(tfrecord_dir='lsun-train-100k');          train.mirror_augment = True
+#desc += '-lsun-tvmonitor';      dataset = EasyDict(tfrecord_dir='lsun-tvmonitor-100k');      train.mirror_augment = True
+
+# Conditioning & snapshot options.
+#desc += '-cond'; dataset.max_label_size = 'full' # conditioned on full label
+#desc += '-cond1'; dataset.max_label_size = 1 # conditioned on first component of the label
+#desc += '-g4k'; grid.size = '4k'
+#desc += '-grpc'; grid.layout = 'row_per_class'
+
+# Config presets (choose one).
+#desc += '-preset-v1-1gpu'; num_gpus = 1; D.mbstd_group_size = 16; sched.minibatch_base = 16; sched.minibatch_dict = {256: 14, 512: 6, 1024: 3}; sched.lod_training_kimg = 800; sched.lod_transition_kimg = 800; train.total_kimg = 19000
+desc += '-preset-v2-1gpu'; num_gpus = 1; sched.minibatch_base = 4; sched.minibatch_dict = {4: 128, 8: 128, 16: 128, 32: 64, 64: 32, 128: 16, 256: 8, 512: 4}; sched.G_lrate_dict = {1024: 0.0015}; sched.D_lrate_dict = EasyDict(sched.G_lrate_dict); train.total_kimg = 12000
+#desc += '-preset-v2-2gpus'; num_gpus = 2; sched.minibatch_base = 8; sched.minibatch_dict = {4: 256, 8: 256, 16: 128, 32: 64, 64: 32, 128: 16, 256: 8}; sched.G_lrate_dict = {512: 0.0015, 1024: 0.002}; sched.D_lrate_dict = EasyDict(sched.G_lrate_dict); train.total_kimg = 12000
+#desc += '-preset-v2-4gpus'; num_gpus = 4; sched.minibatch_base = 16; sched.minibatch_dict = {4: 512, 8: 256, 16: 128, 32: 64, 64: 32, 128: 16}; sched.G_lrate_dict = {256: 0.0015, 512: 0.002, 1024: 0.003}; sched.D_lrate_dict = EasyDict(sched.G_lrate_dict); train.total_kimg = 12000
+#desc += '-preset-v2-8gpus'; num_gpus = 8; sched.minibatch_base = 32; sched.minibatch_dict = {4: 512, 8: 256, 16: 128, 32: 64, 64: 32}; sched.G_lrate_dict = {128: 0.0015, 256: 0.002, 512: 0.003, 1024: 0.003}; sched.D_lrate_dict = EasyDict(sched.G_lrate_dict); train.total_kimg = 12000
+
+# Numerical precision (choose one).
+desc += '-fp32'; sched.max_minibatch_per_gpu = {256: 16, 512: 8, 1024: 4}
+#desc += '-fp16'; G.dtype = 'float16'; D.dtype = 'float16'; G.pixelnorm_epsilon=1e-4; G_opt.use_loss_scaling = True; D_opt.use_loss_scaling = True; sched.max_minibatch_per_gpu = {512: 16, 1024: 8}
+
+# Disable individual features.
+#desc += '-nogrowing'; sched.lod_initial_resolution = 1024; sched.lod_training_kimg = 0; sched.lod_transition_kimg = 0; train.total_kimg = 10000
+#desc += '-nopixelnorm'; G.use_pixelnorm = False
+#desc += '-nowscale'; G.use_wscale = False; D.use_wscale = False
+#desc += '-noleakyrelu'; G.use_leakyrelu = False
+#desc += '-nosmoothing'; train.G_smoothing = 0.0
+#desc += '-norepeat'; train.minibatch_repeats = 1
+#desc += '-noreset'; train.reset_opt_for_new_lod = False
+
+# Special modes.
+#desc += '-BENCHMARK'; sched.lod_initial_resolution = 4; sched.lod_training_kimg = 3; sched.lod_transition_kimg = 3; train.total_kimg = (8*2+1)*3; sched.tick_kimg_base = 1; sched.tick_kimg_dict = {}; train.image_snapshot_ticks = 1000; train.network_snapshot_ticks = 1000
+#desc += '-BENCHMARK0'; sched.lod_initial_resolution = 1024; train.total_kimg = 10; sched.tick_kimg_base = 1; sched.tick_kimg_dict = {}; train.image_snapshot_ticks = 1000; train.network_snapshot_ticks = 1000
+#desc += '-VERBOSE'; sched.tick_kimg_base = 1; sched.tick_kimg_dict = {}; train.image_snapshot_ticks = 1; train.network_snapshot_ticks = 100
+#desc += '-GRAPH'; train.save_tf_graph = True
+#desc += '-HIST'; train.save_weight_histograms = True
+
+#----------------------------------------------------------------------------
+# Utility scripts.
+# To run, uncomment the appropriate line and launch train.py.
+
+#train = EasyDict(func='util_scripts.generate_fake_images', run_id=23, num_pngs=1000); num_gpus = 1; desc = 'fake-images-' + str(train.run_id)
+#train = EasyDict(func='util_scripts.generate_fake_images', run_id=23, grid_size=[15,8], num_pngs=10, image_shrink=4); num_gpus = 1; desc = 'fake-grids-' + str(train.run_id)
+#train = EasyDict(func='util_scripts.generate_interpolation_video', run_id=23, grid_size=[1,1], duration_sec=60.0, smoothing_sec=1.0); num_gpus = 1; desc = 'interpolation-video-' + str(train.run_id)
+#train = EasyDict(func='util_scripts.generate_training_video', run_id=23, duration_sec=20.0); num_gpus = 1; desc = 'training-video-' + str(train.run_id)
+
+#train = EasyDict(func='util_scripts.evaluate_metrics', run_id=23, log='metric-swd-16k.txt', metrics=['swd'], num_images=16384, real_passes=2); num_gpus = 1; desc = train.log.split('.')[0] + '-' + str(train.run_id)
+#train = EasyDict(func='util_scripts.evaluate_metrics', run_id=23, log='metric-fid-10k.txt', metrics=['fid'], num_images=10000, real_passes=1); num_gpus = 1; desc = train.log.split('.')[0] + '-' + str(train.run_id)
+#train = EasyDict(func='util_scripts.evaluate_metrics', run_id=23, log='metric-fid-50k.txt', metrics=['fid'], num_images=50000, real_passes=1); num_gpus = 1; desc = train.log.split('.')[0] + '-' + str(train.run_id)
+#train = EasyDict(func='util_scripts.evaluate_metrics', run_id=23, log='metric-is-50k.txt', metrics=['is'], num_images=50000, real_passes=1); num_gpus = 1; desc = train.log.split('.')[0] + '-' + str(train.run_id)
+#train = EasyDict(func='util_scripts.evaluate_metrics', run_id=23, log='metric-msssim-20k.txt', metrics=['msssim'], num_images=20000, real_passes=1); num_gpus = 1; desc = train.log.split('.')[0] + '-' + str(train.run_id)
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/dataset.py

@@ -0,0 +1,241 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import os
+import glob
+import numpy as np
+import tensorflow as tf
+import tfutil
+
+#----------------------------------------------------------------------------
+# Parse individual image from a tfrecords file.
+
+def parse_tfrecord_tf(record):
+    features = tf.parse_single_example(record, features={
+        'shape': tf.FixedLenFeature([3], tf.int64),
+        'data': tf.FixedLenFeature([], tf.string)})
+    data = tf.decode_raw(features['data'], tf.uint8)
+    return tf.reshape(data, features['shape'])
+
+def parse_tfrecord_np(record):
+    ex = tf.train.Example()
+    ex.ParseFromString(record)
+    shape = ex.features.feature['shape'].int64_list.value
+    data = ex.features.feature['data'].bytes_list.value[0]
+    return np.fromstring(data, np.uint8).reshape(shape)
+
+#----------------------------------------------------------------------------
+# Dataset class that loads data from tfrecords files.
+
+class TFRecordDataset:
+    def __init__(self,
+        tfrecord_dir,               # Directory containing a collection of tfrecords files.
+        resolution      = None,     # Dataset resolution, None = autodetect.
+        label_file      = None,     # Relative path of the labels file, None = autodetect.
+        max_label_size  = 0,        # 0 = no labels, 'full' = full labels, <int> = N first label components.
+        repeat          = True,     # Repeat dataset indefinitely.
+        shuffle_mb      = 4096,     # Shuffle data within specified window (megabytes), 0 = disable shuffling.
+        prefetch_mb     = 2048,     # Amount of data to prefetch (megabytes), 0 = disable prefetching.
+        buffer_mb       = 256,      # Read buffer size (megabytes).
+        num_threads     = 2):       # Number of concurrent threads.
+
+        self.tfrecord_dir       = tfrecord_dir
+        self.resolution         = None
+        self.resolution_log2    = None
+        self.shape              = []        # [channel, height, width]
+        self.dtype              = 'uint8'
+        self.dynamic_range      = [0, 255]
+        self.label_file         = label_file
+        self.label_size         = None      # [component]
+        self.label_dtype        = None
+        self._np_labels         = None
+        self._tf_minibatch_in   = None
+        self._tf_labels_var     = None
+        self._tf_labels_dataset = None
+        self._tf_datasets       = dict()
+        self._tf_iterator       = None
+        self._tf_init_ops       = dict()
+        self._tf_minibatch_np   = None
+        self._cur_minibatch     = -1
+        self._cur_lod           = -1
+
+        # List tfrecords files and inspect their shapes.
+        assert os.path.isdir(self.tfrecord_dir)
+        tfr_files = sorted(glob.glob(os.path.join(self.tfrecord_dir, '*.tfrecords')))
+        assert len(tfr_files) >= 1
+        tfr_shapes = []
+        for tfr_file in tfr_files:
+            tfr_opt = tf.python_io.TFRecordOptions(tf.python_io.TFRecordCompressionType.NONE)
+            for record in tf.python_io.tf_record_iterator(tfr_file, tfr_opt):
+                tfr_shapes.append(parse_tfrecord_np(record).shape)
+                break
+
+        # Autodetect label filename.
+        if self.label_file is None:
+            guess = sorted(glob.glob(os.path.join(self.tfrecord_dir, '*.labels')))
+            if len(guess):
+                self.label_file = guess[0]
+        elif not os.path.isfile(self.label_file):
+            guess = os.path.join(self.tfrecord_dir, self.label_file)
+            if os.path.isfile(guess):
+                self.label_file = guess
+
+        # Determine shape and resolution.
+        max_shape = max(tfr_shapes, key=lambda shape: np.prod(shape))
+        self.resolution = resolution if resolution is not None else max_shape[1]
+        self.resolution_log2 = int(np.log2(self.resolution))
+        self.shape = [max_shape[0], self.resolution, self.resolution]
+        tfr_lods = [self.resolution_log2 - int(np.log2(shape[1])) for shape in tfr_shapes]
+        assert all(shape[0] == max_shape[0] for shape in tfr_shapes)
+        assert all(shape[1] == shape[2] for shape in tfr_shapes)
+        assert all(shape[1] == self.resolution // (2**lod) for shape, lod in zip(tfr_shapes, tfr_lods))
+        assert all(lod in tfr_lods for lod in range(self.resolution_log2 - 1))
+
+        # Load labels.
+        assert max_label_size == 'full' or max_label_size >= 0
+        self._np_labels = np.zeros([1<<20, 0], dtype=np.float32)
+        if self.label_file is not None and max_label_size != 0:
+            self._np_labels = np.load(self.label_file)
+            assert self._np_labels.ndim == 2
+        if max_label_size != 'full' and self._np_labels.shape[1] > max_label_size:
+            self._np_labels = self._np_labels[:, :max_label_size]
+        self.label_size = self._np_labels.shape[1]
+        self.label_dtype = self._np_labels.dtype.name
+
+        # Build TF expressions.
+        with tf.name_scope('Dataset'), tf.device('/cpu:0'):
+            self._tf_minibatch_in = tf.placeholder(tf.int64, name='minibatch_in', shape=[])
+            tf_labels_init = tf.zeros(self._np_labels.shape, self._np_labels.dtype)
+            self._tf_labels_var = tf.Variable(tf_labels_init, name='labels_var')
+            tfutil.set_vars({self._tf_labels_var: self._np_labels})
+            self._tf_labels_dataset = tf.data.Dataset.from_tensor_slices(self._tf_labels_var)
+            for tfr_file, tfr_shape, tfr_lod in zip(tfr_files, tfr_shapes, tfr_lods):
+                if tfr_lod < 0:
+                    continue
+                dset = tf.data.TFRecordDataset(tfr_file, compression_type='', buffer_size=buffer_mb<<20)
+                dset = dset.map(parse_tfrecord_tf, num_parallel_calls=num_threads)
+                dset = tf.data.Dataset.zip((dset, self._tf_labels_dataset))
+                bytes_per_item = np.prod(tfr_shape) * np.dtype(self.dtype).itemsize
+                if shuffle_mb > 0:
+                    dset = dset.shuffle(((shuffle_mb << 20) - 1) // bytes_per_item + 1)
+                if repeat:
+                    dset = dset.repeat()
+                if prefetch_mb > 0:
+                    dset = dset.prefetch(((prefetch_mb << 20) - 1) // bytes_per_item + 1)
+                dset = dset.batch(self._tf_minibatch_in)
+                self._tf_datasets[tfr_lod] = dset
+            self._tf_iterator = tf.data.Iterator.from_structure(self._tf_datasets[0].output_types, self._tf_datasets[0].output_shapes)
+            self._tf_init_ops = {lod: self._tf_iterator.make_initializer(dset) for lod, dset in self._tf_datasets.items()}
+
+    # Use the given minibatch size and level-of-detail for the data returned by get_minibatch_tf().
+    def configure(self, minibatch_size, lod=0):
+        lod = int(np.floor(lod))
+        assert minibatch_size >= 1 and lod in self._tf_datasets
+        if self._cur_minibatch != minibatch_size or self._cur_lod != lod:
+            self._tf_init_ops[lod].run({self._tf_minibatch_in: minibatch_size})
+            self._cur_minibatch = minibatch_size
+            self._cur_lod = lod
+
+    # Get next minibatch as TensorFlow expressions.
+    def get_minibatch_tf(self): # => images, labels
+        return self._tf_iterator.get_next()
+
+    # Get next minibatch as NumPy arrays.
+    def get_minibatch_np(self, minibatch_size, lod=0): # => images, labels
+        self.configure(minibatch_size, lod)
+        if self._tf_minibatch_np is None:
+            self._tf_minibatch_np = self.get_minibatch_tf()
+        return tfutil.run(self._tf_minibatch_np)
+
+    # Get random labels as TensorFlow expression.
+    def get_random_labels_tf(self, minibatch_size): # => labels
+        if self.label_size > 0:
+            return tf.gather(self._tf_labels_var, tf.random_uniform([minibatch_size], 0, self._np_labels.shape[0], dtype=tf.int32))
+        else:
+            return tf.zeros([minibatch_size, 0], self.label_dtype)
+
+    # Get random labels as NumPy array.
+    def get_random_labels_np(self, minibatch_size): # => labels
+        if self.label_size > 0:
+            return self._np_labels[np.random.randint(self._np_labels.shape[0], size=[minibatch_size])]
+        else:
+            return np.zeros([minibatch_size, 0], self.label_dtype)
+
+#----------------------------------------------------------------------------
+# Base class for datasets that are generated on the fly.
+
+class SyntheticDataset:
+    def __init__(self, resolution=1024, num_channels=3, dtype='uint8', dynamic_range=[0,255], label_size=0, label_dtype='float32'):
+        self.resolution         = resolution
+        self.resolution_log2    = int(np.log2(resolution))
+        self.shape              = [num_channels, resolution, resolution]
+        self.dtype              = dtype
+        self.dynamic_range      = dynamic_range
+        self.label_size         = label_size
+        self.label_dtype        = label_dtype
+        self._tf_minibatch_var  = None
+        self._tf_lod_var        = None
+        self._tf_minibatch_np   = None
+        self._tf_labels_np      = None
+
+        assert self.resolution == 2 ** self.resolution_log2
+        with tf.name_scope('Dataset'):
+            self._tf_minibatch_var = tf.Variable(np.int32(0), name='minibatch_var')
+            self._tf_lod_var = tf.Variable(np.int32(0), name='lod_var')
+
+    def configure(self, minibatch_size, lod=0):
+        lod = int(np.floor(lod))
+        assert minibatch_size >= 1 and lod >= 0 and lod <= self.resolution_log2
+        tfutil.set_vars({self._tf_minibatch_var: minibatch_size, self._tf_lod_var: lod})
+
+    def get_minibatch_tf(self): # => images, labels
+        with tf.name_scope('SyntheticDataset'):
+            shrink = tf.cast(2.0 ** tf.cast(self._tf_lod_var, tf.float32), tf.int32)
+            shape = [self.shape[0], self.shape[1] // shrink, self.shape[2] // shrink]
+            images = self._generate_images(self._tf_minibatch_var, self._tf_lod_var, shape)
+            labels = self._generate_labels(self._tf_minibatch_var)
+            return images, labels
+
+    def get_minibatch_np(self, minibatch_size, lod=0): # => images, labels
+        self.configure(minibatch_size, lod)
+        if self._tf_minibatch_np is None:
+            self._tf_minibatch_np = self.get_minibatch_tf()
+        return tfutil.run(self._tf_minibatch_np)
+
+    def get_random_labels_tf(self, minibatch_size): # => labels
+        with tf.name_scope('SyntheticDataset'):
+            return self._generate_labels(minibatch_size)
+
+    def get_random_labels_np(self, minibatch_size): # => labels
+        self.configure(minibatch_size)
+        if self._tf_labels_np is None:
+            self._tf_labels_np = self.get_random_labels_tf()
+        return tfutil.run(self._tf_labels_np)
+
+    def _generate_images(self, minibatch, lod, shape): # to be overridden by subclasses
+        return tf.zeros([minibatch] + shape, self.dtype)
+
+    def _generate_labels(self, minibatch): # to be overridden by subclasses
+        return tf.zeros([minibatch, self.label_size], self.label_dtype)
+
+#----------------------------------------------------------------------------
+# Helper func for constructing a dataset object using the given options.
+
+def load_dataset(class_name='dataset.TFRecordDataset', data_dir=None, verbose=False, **kwargs):
+    adjusted_kwargs = dict(kwargs)
+    if 'tfrecord_dir' in adjusted_kwargs and data_dir is not None:
+        adjusted_kwargs['tfrecord_dir'] = os.path.join(data_dir, adjusted_kwargs['tfrecord_dir'])
+    if verbose:
+        print('Streaming data using %s...' % class_name)
+    dataset = tfutil.import_obj(class_name)(**adjusted_kwargs)
+    if verbose:
+        print('Dataset shape =', np.int32(dataset.shape).tolist())
+        print('Dynamic range =', dataset.dynamic_range)
+        print('Label size    =', dataset.label_size)
+    return dataset
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/dataset_tool.py

@@ -0,0 +1,740 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import os
+import sys
+import glob
+import argparse
+import threading
+import six.moves.queue as Queue
+import traceback
+import numpy as np
+import tensorflow as tf
+import PIL.Image
+
+import tfutil
+import dataset
+
+#----------------------------------------------------------------------------
+
+def error(msg):
+    print('Error: ' + msg)
+    exit(1)
+
+#----------------------------------------------------------------------------
+
+class TFRecordExporter:
+    def __init__(self, tfrecord_dir, expected_images, print_progress=True, progress_interval=10):
+        self.tfrecord_dir       = tfrecord_dir
+        self.tfr_prefix         = os.path.join(self.tfrecord_dir, os.path.basename(self.tfrecord_dir))
+        self.expected_images    = expected_images
+        self.cur_images         = 0
+        self.shape              = None
+        self.resolution_log2    = None
+        self.tfr_writers        = []
+        self.print_progress     = print_progress
+        self.progress_interval  = progress_interval
+        if self.print_progress:
+            print('Creating dataset "%s"' % tfrecord_dir)
+        if not os.path.isdir(self.tfrecord_dir):
+            os.makedirs(self.tfrecord_dir)
+        assert(os.path.isdir(self.tfrecord_dir))
+        
+    def close(self):
+        if self.print_progress:
+            print('%-40s\r' % 'Flushing data...', end='', flush=True)
+        for tfr_writer in self.tfr_writers:
+            tfr_writer.close()
+        self.tfr_writers = []
+        if self.print_progress:
+            print('%-40s\r' % '', end='', flush=True)
+            print('Added %d images.' % self.cur_images)
+
+    def choose_shuffled_order(self): # Note: Images and labels must be added in shuffled order.
+        order = np.arange(self.expected_images)
+        np.random.RandomState(123).shuffle(order)
+        return order
+
+    def add_image(self, img):
+        if self.print_progress and self.cur_images % self.progress_interval == 0:
+            print('%d / %d\r' % (self.cur_images, self.expected_images), end='', flush=True)
+        if self.shape is None:
+            self.shape = img.shape
+            self.resolution_log2 = int(np.log2(self.shape[1]))
+            assert self.shape[0] in [1, 3]
+            assert self.shape[1] == self.shape[2]
+            assert self.shape[1] == 2**self.resolution_log2
+            tfr_opt = tf.python_io.TFRecordOptions(tf.python_io.TFRecordCompressionType.NONE)
+            for lod in range(self.resolution_log2 - 1):
+                tfr_file = self.tfr_prefix + '-r%02d.tfrecords' % (self.resolution_log2 - lod)
+                self.tfr_writers.append(tf.python_io.TFRecordWriter(tfr_file, tfr_opt))
+        assert img.shape == self.shape
+        for lod, tfr_writer in enumerate(self.tfr_writers):
+            if lod:
+                img = img.astype(np.float32)
+                img = (img[:, 0::2, 0::2] + img[:, 0::2, 1::2] + img[:, 1::2, 0::2] + img[:, 1::2, 1::2]) * 0.25
+            quant = np.rint(img).clip(0, 255).astype(np.uint8)
+            ex = tf.train.Example(features=tf.train.Features(feature={
+                'shape': tf.train.Feature(int64_list=tf.train.Int64List(value=quant.shape)),
+                'data': tf.train.Feature(bytes_list=tf.train.BytesList(value=[quant.tostring()]))}))
+            tfr_writer.write(ex.SerializeToString())
+        self.cur_images += 1
+
+    def add_labels(self, labels):
+        if self.print_progress:
+            print('%-40s\r' % 'Saving labels...', end='', flush=True)
+        assert labels.shape[0] == self.cur_images
+        with open(self.tfr_prefix + '-rxx.labels', 'wb') as f:
+            np.save(f, labels.astype(np.float32))
+            
+    def __enter__(self):
+        return self
+    
+    def __exit__(self, *args):
+        self.close()
+
+#----------------------------------------------------------------------------
+
+class ExceptionInfo(object):
+    def __init__(self):
+        self.value = sys.exc_info()[1]
+        self.traceback = traceback.format_exc()
+
+#----------------------------------------------------------------------------
+
+class WorkerThread(threading.Thread):
+    def __init__(self, task_queue):
+        threading.Thread.__init__(self)
+        self.task_queue = task_queue
+
+    def run(self):
+        while True:
+            func, args, result_queue = self.task_queue.get()
+            if func is None:
+                break
+            try:
+                result = func(*args)
+            except:
+                result = ExceptionInfo()
+            result_queue.put((result, args))
+
+#----------------------------------------------------------------------------
+
+class ThreadPool(object):
+    def __init__(self, num_threads):
+        assert num_threads >= 1
+        self.task_queue = Queue.Queue()
+        self.result_queues = dict()
+        self.num_threads = num_threads
+        for idx in range(self.num_threads):
+            thread = WorkerThread(self.task_queue)
+            thread.daemon = True
+            thread.start()
+
+    def add_task(self, func, args=()):
+        assert hasattr(func, '__call__') # must be a function
+        if func not in self.result_queues:
+            self.result_queues[func] = Queue.Queue()
+        self.task_queue.put((func, args, self.result_queues[func]))
+
+    def get_result(self, func): # returns (result, args)
+        result, args = self.result_queues[func].get()
+        if isinstance(result, ExceptionInfo):
+            print('\n\nWorker thread caught an exception:\n' + result.traceback)
+            raise result.value
+        return result, args
+
+    def finish(self):
+        for idx in range(self.num_threads):
+            self.task_queue.put((None, (), None))
+
+    def __enter__(self): # for 'with' statement
+        return self
+
+    def __exit__(self, *excinfo):
+        self.finish()
+
+    def process_items_concurrently(self, item_iterator, process_func=lambda x: x, pre_func=lambda x: x, post_func=lambda x: x, max_items_in_flight=None):
+        if max_items_in_flight is None: max_items_in_flight = self.num_threads * 4
+        assert max_items_in_flight >= 1
+        results = []
+        retire_idx = [0]
+
+        def task_func(prepared, idx):
+            return process_func(prepared)
+           
+        def retire_result():
+            processed, (prepared, idx) = self.get_result(task_func)
+            results[idx] = processed
+            while retire_idx[0] < len(results) and results[retire_idx[0]] is not None:
+                yield post_func(results[retire_idx[0]])
+                results[retire_idx[0]] = None
+                retire_idx[0] += 1
+    
+        for idx, item in enumerate(item_iterator):
+            prepared = pre_func(item)
+            results.append(None)
+            self.add_task(func=task_func, args=(prepared, idx))
+            while retire_idx[0] < idx - max_items_in_flight + 2:
+                for res in retire_result(): yield res
+        while retire_idx[0] < len(results):
+            for res in retire_result(): yield res
+
+#----------------------------------------------------------------------------
+
+def display(tfrecord_dir):
+    print('Loading dataset "%s"' % tfrecord_dir)
+    tfutil.init_tf({'gpu_options.allow_growth': True})
+    dset = dataset.TFRecordDataset(tfrecord_dir, max_label_size='full', repeat=False, shuffle_mb=0)
+    tfutil.init_uninited_vars()
+    
+    idx = 0
+    while True:
+        try:
+            images, labels = dset.get_minibatch_np(1)
+        except tf.errors.OutOfRangeError:
+            break
+        if idx == 0:
+            print('Displaying images')
+            import cv2 # pip install opencv-python
+            cv2.namedWindow('dataset_tool')
+            print('Press SPACE or ENTER to advance, ESC to exit')
+        print('\nidx = %-8d\nlabel = %s' % (idx, labels[0].tolist()))
+        cv2.imshow('dataset_tool', images[0].transpose(1, 2, 0)[:, :, ::-1]) # CHW => HWC, RGB => BGR
+        idx += 1
+        if cv2.waitKey() == 27:
+            break
+    print('\nDisplayed %d images.' % idx)
+
+#----------------------------------------------------------------------------
+
+def extract(tfrecord_dir, output_dir):
+    print('Loading dataset "%s"' % tfrecord_dir)
+    tfutil.init_tf({'gpu_options.allow_growth': True})
+    dset = dataset.TFRecordDataset(tfrecord_dir, max_label_size=0, repeat=False, shuffle_mb=0)
+    tfutil.init_uninited_vars()
+    
+    print('Extracting images to "%s"' % output_dir)
+    if not os.path.isdir(output_dir):
+        os.makedirs(output_dir)
+    idx = 0
+    while True:
+        if idx % 10 == 0:
+            print('%d\r' % idx, end='', flush=True)
+        try:
+            images, labels = dset.get_minibatch_np(1)
+        except tf.errors.OutOfRangeError:
+            break
+        if images.shape[1] == 1:
+            img = PIL.Image.fromarray(images[0][0], 'L')
+        else:
+            img = PIL.Image.fromarray(images[0].transpose(1, 2, 0), 'RGB')
+        img.save(os.path.join(output_dir, 'img%08d.png' % idx))
+        idx += 1
+    print('Extracted %d images.' % idx)
+
+#----------------------------------------------------------------------------
+
+def compare(tfrecord_dir_a, tfrecord_dir_b, ignore_labels):
+    max_label_size = 0 if ignore_labels else 'full'
+    print('Loading dataset "%s"' % tfrecord_dir_a)
+    tfutil.init_tf({'gpu_options.allow_growth': True})
+    dset_a = dataset.TFRecordDataset(tfrecord_dir_a, max_label_size=max_label_size, repeat=False, shuffle_mb=0)
+    print('Loading dataset "%s"' % tfrecord_dir_b)
+    dset_b = dataset.TFRecordDataset(tfrecord_dir_b, max_label_size=max_label_size, repeat=False, shuffle_mb=0)
+    tfutil.init_uninited_vars()
+    
+    print('Comparing datasets')
+    idx = 0
+    identical_images = 0
+    identical_labels = 0
+    while True:
+        if idx % 100 == 0:
+            print('%d\r' % idx, end='', flush=True)
+        try:
+            images_a, labels_a = dset_a.get_minibatch_np(1)
+        except tf.errors.OutOfRangeError:
+            images_a, labels_a = None, None
+        try:
+            images_b, labels_b = dset_b.get_minibatch_np(1)
+        except tf.errors.OutOfRangeError:
+            images_b, labels_b = None, None
+        if images_a is None or images_b is None:
+            if images_a is not None or images_b is not None:
+                print('Datasets contain different number of images')
+            break
+        if images_a.shape == images_b.shape and np.all(images_a == images_b):
+            identical_images += 1
+        else:
+            print('Image %d is different' % idx)
+        if labels_a.shape == labels_b.shape and np.all(labels_a == labels_b):
+            identical_labels += 1
+        else:
+            print('Label %d is different' % idx)
+        idx += 1
+    print('Identical images: %d / %d' % (identical_images, idx))
+    if not ignore_labels:
+        print('Identical labels: %d / %d' % (identical_labels, idx))
+
+#----------------------------------------------------------------------------
+
+def create_mnist(tfrecord_dir, mnist_dir):
+    print('Loading MNIST from "%s"' % mnist_dir)
+    import gzip
+    with gzip.open(os.path.join(mnist_dir, 'train-images-idx3-ubyte.gz'), 'rb') as file:
+        images = np.frombuffer(file.read(), np.uint8, offset=16)
+    with gzip.open(os.path.join(mnist_dir, 'train-labels-idx1-ubyte.gz'), 'rb') as file:
+        labels = np.frombuffer(file.read(), np.uint8, offset=8)
+    images = images.reshape(-1, 1, 28, 28)
+    images = np.pad(images, [(0,0), (0,0), (2,2), (2,2)], 'constant', constant_values=0)
+    assert images.shape == (60000, 1, 32, 32) and images.dtype == np.uint8
+    assert labels.shape == (60000,) and labels.dtype == np.uint8
+    assert np.min(images) == 0 and np.max(images) == 255
+    assert np.min(labels) == 0 and np.max(labels) == 9
+    onehot = np.zeros((labels.size, np.max(labels) + 1), dtype=np.float32)
+    onehot[np.arange(labels.size), labels] = 1.0
+    
+    with TFRecordExporter(tfrecord_dir, images.shape[0]) as tfr:
+        order = tfr.choose_shuffled_order()
+        for idx in range(order.size):
+            tfr.add_image(images[order[idx]])
+        tfr.add_labels(onehot[order])
+
+#----------------------------------------------------------------------------
+
+def create_mnistrgb(tfrecord_dir, mnist_dir, num_images=1000000, random_seed=123):
+    print('Loading MNIST from "%s"' % mnist_dir)
+    import gzip
+    with gzip.open(os.path.join(mnist_dir, 'train-images-idx3-ubyte.gz'), 'rb') as file:
+        images = np.frombuffer(file.read(), np.uint8, offset=16)
+    images = images.reshape(-1, 28, 28)
+    images = np.pad(images, [(0,0), (2,2), (2,2)], 'constant', constant_values=0)
+    assert images.shape == (60000, 32, 32) and images.dtype == np.uint8
+    assert np.min(images) == 0 and np.max(images) == 255
+    
+    with TFRecordExporter(tfrecord_dir, num_images) as tfr:
+        rnd = np.random.RandomState(random_seed)
+        for idx in range(num_images):
+            tfr.add_image(images[rnd.randint(images.shape[0], size=3)])
+
+#----------------------------------------------------------------------------
+
+def create_cifar10(tfrecord_dir, cifar10_dir):
+    print('Loading CIFAR-10 from "%s"' % cifar10_dir)
+    import pickle
+    images = []
+    labels = []
+    for batch in range(1, 6):
+        with open(os.path.join(cifar10_dir, 'data_batch_%d' % batch), 'rb') as file:
+            data = pickle.load(file, encoding='latin1')
+        images.append(data['data'].reshape(-1, 3, 32, 32))
+        labels.append(data['labels'])
+    images = np.concatenate(images)
+    labels = np.concatenate(labels)
+    assert images.shape == (50000, 3, 32, 32) and images.dtype == np.uint8
+    assert labels.shape == (50000,) and labels.dtype == np.int32
+    assert np.min(images) == 0 and np.max(images) == 255
+    assert np.min(labels) == 0 and np.max(labels) == 9
+    onehot = np.zeros((labels.size, np.max(labels) + 1), dtype=np.float32)
+    onehot[np.arange(labels.size), labels] = 1.0
+
+    with TFRecordExporter(tfrecord_dir, images.shape[0]) as tfr:
+        order = tfr.choose_shuffled_order()
+        for idx in range(order.size):
+            tfr.add_image(images[order[idx]])
+        tfr.add_labels(onehot[order])
+
+#----------------------------------------------------------------------------
+
+def create_cifar100(tfrecord_dir, cifar100_dir):
+    print('Loading CIFAR-100 from "%s"' % cifar100_dir)
+    import pickle
+    with open(os.path.join(cifar100_dir, 'train'), 'rb') as file:
+        data = pickle.load(file, encoding='latin1')
+    images = data['data'].reshape(-1, 3, 32, 32)
+    labels = np.array(data['fine_labels'])
+    assert images.shape == (50000, 3, 32, 32) and images.dtype == np.uint8
+    assert labels.shape == (50000,) and labels.dtype == np.int32
+    assert np.min(images) == 0 and np.max(images) == 255
+    assert np.min(labels) == 0 and np.max(labels) == 99
+    onehot = np.zeros((labels.size, np.max(labels) + 1), dtype=np.float32)
+    onehot[np.arange(labels.size), labels] = 1.0
+
+    with TFRecordExporter(tfrecord_dir, images.shape[0]) as tfr:
+        order = tfr.choose_shuffled_order()
+        for idx in range(order.size):
+            tfr.add_image(images[order[idx]])
+        tfr.add_labels(onehot[order])
+
+#----------------------------------------------------------------------------
+
+def create_svhn(tfrecord_dir, svhn_dir):
+    print('Loading SVHN from "%s"' % svhn_dir)
+    import pickle
+    images = []
+    labels = []
+    for batch in range(1, 4):
+        with open(os.path.join(svhn_dir, 'train_%d.pkl' % batch), 'rb') as file:
+            data = pickle.load(file, encoding='latin1')
+        images.append(data[0])
+        labels.append(data[1])
+    images = np.concatenate(images)
+    labels = np.concatenate(labels)
+    assert images.shape == (73257, 3, 32, 32) and images.dtype == np.uint8
+    assert labels.shape == (73257,) and labels.dtype == np.uint8
+    assert np.min(images) == 0 and np.max(images) == 255
+    assert np.min(labels) == 0 and np.max(labels) == 9
+    onehot = np.zeros((labels.size, np.max(labels) + 1), dtype=np.float32)
+    onehot[np.arange(labels.size), labels] = 1.0
+
+    with TFRecordExporter(tfrecord_dir, images.shape[0]) as tfr:
+        order = tfr.choose_shuffled_order()
+        for idx in range(order.size):
+            tfr.add_image(images[order[idx]])
+        tfr.add_labels(onehot[order])
+
+#----------------------------------------------------------------------------
+
+def create_lsun(tfrecord_dir, lmdb_dir, resolution=256, max_images=None):
+    print('Loading LSUN dataset from "%s"' % lmdb_dir)
+    import lmdb # pip install lmdb
+    import cv2 # pip install opencv-python
+    import io
+    with lmdb.open(lmdb_dir, readonly=True).begin(write=False) as txn:
+        total_images = txn.stat()['entries']
+        if max_images is None:
+            max_images = total_images
+        with TFRecordExporter(tfrecord_dir, max_images) as tfr:
+            for idx, (key, value) in enumerate(txn.cursor()):
+                try:
+                    try:
+                        img = cv2.imdecode(np.fromstring(value, dtype=np.uint8), 1)
+                        if img is None:
+                            raise IOError('cv2.imdecode failed')
+                        img = img[:, :, ::-1] # BGR => RGB
+                    except IOError:
+                        img = np.asarray(PIL.Image.open(io.BytesIO(value)))
+                    crop = np.min(img.shape[:2])
+                    img = img[(img.shape[0] - crop) // 2 : (img.shape[0] + crop) // 2, (img.shape[1] - crop) // 2 : (img.shape[1] + crop) // 2]
+                    img = PIL.Image.fromarray(img, 'RGB')
+                    img = img.resize((resolution, resolution), PIL.Image.ANTIALIAS)
+                    img = np.asarray(img)
+                    img = img.transpose(2, 0, 1) # HWC => CHW
+                    tfr.add_image(img)
+                except:
+                    print(sys.exc_info()[1])
+                if tfr.cur_images == max_images:
+                    break
+        
+#----------------------------------------------------------------------------
+
+def create_celeba(tfrecord_dir, celeba_dir, cx=89, cy=121):
+    print('Loading CelebA from "%s"' % celeba_dir)
+    glob_pattern = os.path.join(celeba_dir, 'img_align_celeba_png', '*.png')
+    image_filenames = sorted(glob.glob(glob_pattern))
+    expected_images = 202599
+    if len(image_filenames) != expected_images:
+        error('Expected to find %d images' % expected_images)
+    
+    with TFRecordExporter(tfrecord_dir, len(image_filenames)) as tfr:
+        order = tfr.choose_shuffled_order()
+        for idx in range(order.size):
+            img = np.asarray(PIL.Image.open(image_filenames[order[idx]]))
+            assert img.shape == (218, 178, 3)
+            img = img[cy - 64 : cy + 64, cx - 64 : cx + 64]
+            img = img.transpose(2, 0, 1) # HWC => CHW
+            tfr.add_image(img)
+
+#----------------------------------------------------------------------------
+
+def create_celebahq(tfrecord_dir, celeba_dir, delta_dir, num_threads=4, num_tasks=100):
+    print('Loading CelebA from "%s"' % celeba_dir)
+    expected_images = 202599
+    if len(glob.glob(os.path.join(celeba_dir, 'img_celeba', '*.jpg'))) != expected_images:
+        error('Expected to find %d images' % expected_images)
+    with open(os.path.join(celeba_dir, 'Anno', 'list_landmarks_celeba.txt'), 'rt') as file:
+        landmarks = [[float(value) for value in line.split()[1:]] for line in file.readlines()[2:]]
+        landmarks = np.float32(landmarks).reshape(-1, 5, 2)
+    
+    print('Loading CelebA-HQ deltas from "%s"' % delta_dir)
+    import scipy.ndimage
+    import hashlib
+    import bz2
+    import zipfile
+    import base64
+    import cryptography.hazmat.primitives.hashes
+    import cryptography.hazmat.backends
+    import cryptography.hazmat.primitives.kdf.pbkdf2
+    import cryptography.fernet
+    expected_zips = 30
+    if len(glob.glob(os.path.join(delta_dir, 'delta*.zip'))) != expected_zips:
+        error('Expected to find %d zips' % expected_zips)
+    with open(os.path.join(delta_dir, 'image_list.txt'), 'rt') as file:
+        lines = [line.split() for line in file]
+        fields = dict()
+        for idx, field in enumerate(lines[0]):
+            type = int if field.endswith('idx') else str
+            fields[field] = [type(line[idx]) for line in lines[1:]]
+    indices = np.array(fields['idx'])
+
+    # Must use pillow version 3.1.1 for everything to work correctly.
+    if getattr(PIL, 'PILLOW_VERSION', '') != '3.1.1':
+        error('create_celebahq requires pillow version 3.1.1') # conda install pillow=3.1.1
+        
+    # Must use libjpeg version 8d for everything to work correctly.
+    img = np.array(PIL.Image.open(os.path.join(celeba_dir, 'img_celeba', '000001.jpg')))
+    md5 = hashlib.md5()
+    md5.update(img.tobytes())
+    if md5.hexdigest() != '9cad8178d6cb0196b36f7b34bc5eb6d3':
+        error('create_celebahq requires libjpeg version 8d') # conda install jpeg=8d
+
+    def rot90(v):
+        return np.array([-v[1], v[0]])
+
+    def process_func(idx):
+        # Load original image.
+        orig_idx = fields['orig_idx'][idx]
+        orig_file = fields['orig_file'][idx]
+        orig_path = os.path.join(celeba_dir, 'img_celeba', orig_file)
+        img = PIL.Image.open(orig_path)
+
+        # Choose oriented crop rectangle.
+        lm = landmarks[orig_idx]
+        eye_avg = (lm[0] + lm[1]) * 0.5 + 0.5
+        mouth_avg = (lm[3] + lm[4]) * 0.5 + 0.5
+        eye_to_eye = lm[1] - lm[0]
+        eye_to_mouth = mouth_avg - eye_avg
+        x = eye_to_eye - rot90(eye_to_mouth)
+        x /= np.hypot(*x)
+        x *= max(np.hypot(*eye_to_eye) * 2.0, np.hypot(*eye_to_mouth) * 1.8)
+        y = rot90(x)
+        c = eye_avg + eye_to_mouth * 0.1
+        quad = np.stack([c - x - y, c - x + y, c + x + y, c + x - y])
+        zoom = 1024 / (np.hypot(*x) * 2)
+
+        # Shrink.
+        shrink = int(np.floor(0.5 / zoom))
+        if shrink > 1:
+            size = (int(np.round(float(img.size[0]) / shrink)), int(np.round(float(img.size[1]) / shrink)))
+            img = img.resize(size, PIL.Image.ANTIALIAS)
+            quad /= shrink
+            zoom *= shrink
+
+        # Crop.
+        border = max(int(np.round(1024 * 0.1 / zoom)), 3)
+        crop = (int(np.floor(min(quad[:,0]))), int(np.floor(min(quad[:,1]))), int(np.ceil(max(quad[:,0]))), int(np.ceil(max(quad[:,1]))))
+        crop = (max(crop[0] - border, 0), max(crop[1] - border, 0), min(crop[2] + border, img.size[0]), min(crop[3] + border, img.size[1]))
+        if crop[2] - crop[0] < img.size[0] or crop[3] - crop[1] < img.size[1]:
+            img = img.crop(crop)
+            quad -= crop[0:2]
+
+        # Simulate super-resolution.
+        superres = int(np.exp2(np.ceil(np.log2(zoom))))
+        if superres > 1:
+            img = img.resize((img.size[0] * superres, img.size[1] * superres), PIL.Image.ANTIALIAS)
+            quad *= superres
+            zoom /= superres
+
+        # Pad.
+        pad = (int(np.floor(min(quad[:,0]))), int(np.floor(min(quad[:,1]))), int(np.ceil(max(quad[:,0]))), int(np.ceil(max(quad[:,1]))))
+        pad = (max(-pad[0] + border, 0), max(-pad[1] + border, 0), max(pad[2] - img.size[0] + border, 0), max(pad[3] - img.size[1] + border, 0))
+        if max(pad) > border - 4:
+            pad = np.maximum(pad, int(np.round(1024 * 0.3 / zoom)))
+            img = np.pad(np.float32(img), ((pad[1], pad[3]), (pad[0], pad[2]), (0, 0)), 'reflect')
+            h, w, _ = img.shape
+            y, x, _ = np.mgrid[:h, :w, :1]
+            mask = 1.0 - np.minimum(np.minimum(np.float32(x) / pad[0], np.float32(y) / pad[1]), np.minimum(np.float32(w-1-x) / pad[2], np.float32(h-1-y) / pad[3]))
+            blur = 1024 * 0.02 / zoom
+            img += (scipy.ndimage.gaussian_filter(img, [blur, blur, 0]) - img) * np.clip(mask * 3.0 + 1.0, 0.0, 1.0)
+            img += (np.median(img, axis=(0,1)) - img) * np.clip(mask, 0.0, 1.0)
+            img = PIL.Image.fromarray(np.uint8(np.clip(np.round(img), 0, 255)), 'RGB')
+            quad += pad[0:2]
+            
+        # Transform.
+        img = img.transform((4096, 4096), PIL.Image.QUAD, (quad + 0.5).flatten(), PIL.Image.BILINEAR)
+        img = img.resize((1024, 1024), PIL.Image.ANTIALIAS)
+        img = np.asarray(img).transpose(2, 0, 1)
+        
+        # Verify MD5.
+        md5 = hashlib.md5()
+        md5.update(img.tobytes())
+        assert md5.hexdigest() == fields['proc_md5'][idx]
+        
+        # Load delta image and original JPG.
+        with zipfile.ZipFile(os.path.join(delta_dir, 'deltas%05d.zip' % (idx - idx % 1000)), 'r') as zip:
+            delta_bytes = zip.read('delta%05d.dat' % idx)
+        with open(orig_path, 'rb') as file:
+            orig_bytes = file.read()
+        
+        # Decrypt delta image, using original JPG data as decryption key.
+        algorithm = cryptography.hazmat.primitives.hashes.SHA256()
+        backend = cryptography.hazmat.backends.default_backend()
+        salt = bytes(orig_file, 'ascii')
+        kdf = cryptography.hazmat.primitives.kdf.pbkdf2.PBKDF2HMAC(algorithm=algorithm, length=32, salt=salt, iterations=100000, backend=backend)
+        key = base64.urlsafe_b64encode(kdf.derive(orig_bytes))
+        delta = np.frombuffer(bz2.decompress(cryptography.fernet.Fernet(key).decrypt(delta_bytes)), dtype=np.uint8).reshape(3, 1024, 1024)
+        
+        # Apply delta image.
+        img = img + delta
+        
+        # Verify MD5.
+        md5 = hashlib.md5()
+        md5.update(img.tobytes())
+        assert md5.hexdigest() == fields['final_md5'][idx]
+        return img
+
+    with TFRecordExporter(tfrecord_dir, indices.size) as tfr:
+        order = tfr.choose_shuffled_order()
+        with ThreadPool(num_threads) as pool:
+            for img in pool.process_items_concurrently(indices[order].tolist(), process_func=process_func, max_items_in_flight=num_tasks):
+                tfr.add_image(img)
+
+#----------------------------------------------------------------------------
+
+def create_from_images(tfrecord_dir, image_dir, shuffle):
+    print('Loading images from "%s"' % image_dir)
+    image_filenames = sorted(glob.glob(os.path.join(image_dir, '*')))
+    if len(image_filenames) == 0:
+        error('No input images found')
+        
+    img = np.asarray(PIL.Image.open(image_filenames[0]))
+    resolution = img.shape[0]
+    channels = img.shape[2] if img.ndim == 3 else 1
+    if img.shape[1] != resolution:
+        error('Input images must have the same width and height')
+    if resolution != 2 ** int(np.floor(np.log2(resolution))):
+        error('Input image resolution must be a power-of-two')
+    if channels not in [1, 3]:
+        error('Input images must be stored as RGB or grayscale')
+    
+    with TFRecordExporter(tfrecord_dir, len(image_filenames)) as tfr:
+        order = tfr.choose_shuffled_order() if shuffle else np.arange(len(image_filenames))
+        for idx in range(order.size):
+            img = np.asarray(PIL.Image.open(image_filenames[order[idx]]))
+            if channels == 1:
+                img = img[np.newaxis, :, :] # HW => CHW
+            else:
+                img = img.transpose(2, 0, 1) # HWC => CHW
+            tfr.add_image(img)
+
+#----------------------------------------------------------------------------
+
+def create_from_hdf5(tfrecord_dir, hdf5_filename, shuffle):
+    print('Loading HDF5 archive from "%s"' % hdf5_filename)
+    import h5py # conda install h5py
+    with h5py.File(hdf5_filename, 'r') as hdf5_file:
+        hdf5_data = max([value for key, value in hdf5_file.items() if key.startswith('data')], key=lambda lod: lod.shape[3])
+        with TFRecordExporter(tfrecord_dir, hdf5_data.shape[0]) as tfr:
+            order = tfr.choose_shuffled_order() if shuffle else np.arange(hdf5_data.shape[0])
+            for idx in range(order.size):
+                tfr.add_image(hdf5_data[order[idx]])
+            npy_filename = os.path.splitext(hdf5_filename)[0] + '-labels.npy'
+            if os.path.isfile(npy_filename):
+                tfr.add_labels(np.load(npy_filename)[order])
+
+#----------------------------------------------------------------------------
+
+def execute_cmdline(argv):
+    prog = argv[0]
+    parser = argparse.ArgumentParser(
+        prog        = prog,
+        description = 'Tool for creating, extracting, and visualizing Progressive GAN datasets.',
+        epilog      = 'Type "%s <command> -h" for more information.' % prog)
+        
+    subparsers = parser.add_subparsers(dest='command')
+    subparsers.required = True
+    def add_command(cmd, desc, example=None):
+        epilog = 'Example: %s %s' % (prog, example) if example is not None else None
+        return subparsers.add_parser(cmd, description=desc, help=desc, epilog=epilog)
+
+    p = add_command(    'display',          'Display images in dataset.',
+                                            'display datasets/mnist')
+    p.add_argument(     'tfrecord_dir',     help='Directory containing dataset')
+  
+    p = add_command(    'extract',          'Extract images from dataset.',
+                                            'extract datasets/mnist mnist-images')
+    p.add_argument(     'tfrecord_dir',     help='Directory containing dataset')
+    p.add_argument(     'output_dir',       help='Directory to extract the images into')
+
+    p = add_command(    'compare',          'Compare two datasets.',
+                                            'compare datasets/mydataset datasets/mnist')
+    p.add_argument(     'tfrecord_dir_a',   help='Directory containing first dataset')
+    p.add_argument(     'tfrecord_dir_b',   help='Directory containing second dataset')
+    p.add_argument(     '--ignore_labels',  help='Ignore labels (default: 0)', type=int, default=0)
+
+    p = add_command(    'create_mnist',     'Create dataset for MNIST.',
+                                            'create_mnist datasets/mnist ~/downloads/mnist')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'mnist_dir',        help='Directory containing MNIST')
+
+    p = add_command(    'create_mnistrgb',  'Create dataset for MNIST-RGB.',
+                                            'create_mnistrgb datasets/mnistrgb ~/downloads/mnist')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'mnist_dir',        help='Directory containing MNIST')
+    p.add_argument(     '--num_images',     help='Number of composite images to create (default: 1000000)', type=int, default=1000000)
+    p.add_argument(     '--random_seed',    help='Random seed (default: 123)', type=int, default=123)
+
+    p = add_command(    'create_cifar10',   'Create dataset for CIFAR-10.',
+                                            'create_cifar10 datasets/cifar10 ~/downloads/cifar10')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'cifar10_dir',      help='Directory containing CIFAR-10')
+
+    p = add_command(    'create_cifar100',  'Create dataset for CIFAR-100.',
+                                            'create_cifar100 datasets/cifar100 ~/downloads/cifar100')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'cifar100_dir',     help='Directory containing CIFAR-100')
+
+    p = add_command(    'create_svhn',      'Create dataset for SVHN.',
+                                            'create_svhn datasets/svhn ~/downloads/svhn')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'svhn_dir',         help='Directory containing SVHN')
+
+    p = add_command(    'create_lsun',      'Create dataset for single LSUN category.',
+                                            'create_lsun datasets/lsun-car-100k ~/downloads/lsun/car_lmdb --resolution 256 --max_images 100000')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'lmdb_dir',         help='Directory containing LMDB database')
+    p.add_argument(     '--resolution',     help='Output resolution (default: 256)', type=int, default=256)
+    p.add_argument(     '--max_images',     help='Maximum number of images (default: none)', type=int, default=None)
+
+    p = add_command(    'create_celeba',    'Create dataset for CelebA.',
+                                            'create_celeba datasets/celeba ~/downloads/celeba')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'celeba_dir',       help='Directory containing CelebA')
+    p.add_argument(     '--cx',             help='Center X coordinate (default: 89)', type=int, default=89)
+    p.add_argument(     '--cy',             help='Center Y coordinate (default: 121)', type=int, default=121)
+
+    p = add_command(    'create_celebahq',  'Create dataset for CelebA-HQ.',
+                                            'create_celebahq datasets/celebahq ~/downloads/celeba ~/downloads/celeba-hq-deltas')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'celeba_dir',       help='Directory containing CelebA')
+    p.add_argument(     'delta_dir',        help='Directory containing CelebA-HQ deltas')
+    p.add_argument(     '--num_threads',    help='Number of concurrent threads (default: 4)', type=int, default=4)
+    p.add_argument(     '--num_tasks',      help='Number of concurrent processing tasks (default: 100)', type=int, default=100)
+
+    p = add_command(    'create_from_images', 'Create dataset from a directory full of images.',
+                                            'create_from_images datasets/mydataset myimagedir')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'image_dir',        help='Directory containing the images')
+    p.add_argument(     '--shuffle',        help='Randomize image order (default: 1)', type=int, default=1)
+
+    p = add_command(    'create_from_hdf5', 'Create dataset from legacy HDF5 archive.',
+                                            'create_from_hdf5 datasets/celebahq ~/downloads/celeba-hq-1024x1024.h5')
+    p.add_argument(     'tfrecord_dir',     help='New dataset directory to be created')
+    p.add_argument(     'hdf5_filename',    help='HDF5 archive containing the images')
+    p.add_argument(     '--shuffle',        help='Randomize image order (default: 1)', type=int, default=1)
+
+    args = parser.parse_args(argv[1:] if len(argv) > 1 else ['-h'])
+    func = globals()[args.command]
+    del args.command
+    func(**vars(args))
+
+#----------------------------------------------------------------------------
+
+if __name__ == "__main__":
+    execute_cmdline(sys.argv)
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/legacy.py

@@ -0,0 +1,117 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import pickle
+import inspect
+import numpy as np
+
+import tfutil
+import networks
+
+#----------------------------------------------------------------------------
+# Custom unpickler that is able to load network pickles produced by
+# the old Theano implementation.
+
+class LegacyUnpickler(pickle.Unpickler):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+    def find_class(self, module, name):
+        if module == 'network' and name == 'Network':
+            return tfutil.Network
+        return super().find_class(module, name)
+
+#----------------------------------------------------------------------------
+# Import handler for tfutil.Network that silently converts networks produced
+# by the old Theano implementation to a suitable format.
+
+theano_gan_remap = {
+    'G_paper':          'G_paper',
+    'G_progressive_8':  'G_paper',
+    'D_paper':          'D_paper',
+    'D_progressive_8':  'D_paper'}
+
+def patch_theano_gan(state):
+    if 'version' in state or state['build_func_spec']['func'] not in theano_gan_remap:
+        return state
+
+    spec = dict(state['build_func_spec'])
+    func = spec.pop('func')
+    resolution = spec.get('resolution', 32)
+    resolution_log2 = int(np.log2(resolution))
+    use_wscale = spec.get('use_wscale', True)
+
+    assert spec.pop('label_size',       0)          == 0
+    assert spec.pop('use_batchnorm',    False)      == False
+    assert spec.pop('tanh_at_end',      None)       is None
+    assert spec.pop('mbstat_func',      'Tstdeps')  == 'Tstdeps'
+    assert spec.pop('mbstat_avg',       'all')      == 'all'
+    assert spec.pop('mbdisc_kernels',   None)       is None
+    spec.pop(       'use_gdrop',        True)       # doesn't make a difference
+    assert spec.pop('use_layernorm',    False)      == False
+    spec[           'fused_scale']                  = False
+    spec[           'mbstd_group_size']             = 16
+
+    vars = []
+    param_iter = iter(state['param_values'])
+    relu = np.sqrt(2); linear = 1.0
+    def flatten2(w): return w.reshape(w.shape[0], -1)
+    def he_std(gain, w): return gain / np.sqrt(np.prod(w.shape[:-1]))
+    def wscale(gain, w): return w * next(param_iter) / he_std(gain, w) if use_wscale else w
+    def layer(name, gain, w): return [(name + '/weight', wscale(gain, w)), (name + '/bias', next(param_iter))]
+    
+    if func.startswith('G'):
+        vars += layer('4x4/Dense', relu/4, flatten2(next(param_iter).transpose(1,0,2,3)))
+        vars += layer('4x4/Conv', relu, next(param_iter).transpose(2,3,1,0)[::-1,::-1])
+        for res in range(3, resolution_log2 + 1):
+            vars += layer('%dx%d/Conv0' % (2**res, 2**res), relu, next(param_iter).transpose(2,3,1,0)[::-1,::-1])
+            vars += layer('%dx%d/Conv1' % (2**res, 2**res), relu, next(param_iter).transpose(2,3,1,0)[::-1,::-1])
+        for lod in range(0, resolution_log2 - 1):
+            vars += layer('ToRGB_lod%d' % lod, linear, next(param_iter)[np.newaxis, np.newaxis])
+
+    if func.startswith('D'):
+        vars += layer('FromRGB_lod0', relu, next(param_iter)[np.newaxis, np.newaxis])
+        for res in range(resolution_log2, 2, -1):
+            vars += layer('%dx%d/Conv0' % (2**res, 2**res), relu, next(param_iter).transpose(2,3,1,0)[::-1,::-1])
+            vars += layer('%dx%d/Conv1' % (2**res, 2**res), relu, next(param_iter).transpose(2,3,1,0)[::-1,::-1])
+            vars += layer('FromRGB_lod%d' % (resolution_log2 - (res - 1)), relu, next(param_iter)[np.newaxis, np.newaxis])
+        vars += layer('4x4/Conv', relu, next(param_iter).transpose(2,3,1,0)[::-1,::-1])
+        vars += layer('4x4/Dense0', relu, flatten2(next(param_iter)[:,:,::-1,::-1]).transpose())
+        vars += layer('4x4/Dense1', linear, next(param_iter))
+
+    vars += [('lod', state['toplevel_params']['cur_lod'])]
+
+    return {
+        'version':          2,
+        'name':             func,
+        'build_module_src': inspect.getsource(networks),
+        'build_func_name':  theano_gan_remap[func],
+        'static_kwargs':    spec,
+        'variables':        vars}
+
+tfutil.network_import_handlers.append(patch_theano_gan)
+
+#----------------------------------------------------------------------------
+# Import handler for tfutil.Network that ignores unsupported/deprecated
+# networks produced by older versions of the code.
+
+def ignore_unknown_theano_network(state):
+    if 'version' in state:
+        return state
+
+    print('Ignoring unknown Theano network:', state['build_func_spec']['func'])
+    return {
+        'version':          2,
+        'name':             'Dummy',
+        'build_module_src': 'def dummy(input, **kwargs): input.set_shape([None, 1]); return input',
+        'build_func_name':  'dummy',
+        'static_kwargs':    {},
+        'variables':        []}
+
+tfutil.network_import_handlers.append(ignore_unknown_theano_network)
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/loss.py

@@ -0,0 +1,82 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import numpy as np
+import tensorflow as tf
+
+import tfutil
+
+#----------------------------------------------------------------------------
+# Convenience func that casts all of its arguments to tf.float32.
+
+def fp32(*values):
+    if len(values) == 1 and isinstance(values[0], tuple):
+        values = values[0]
+    values = tuple(tf.cast(v, tf.float32) for v in values)
+    return values if len(values) >= 2 else values[0]
+
+#----------------------------------------------------------------------------
+# Generator loss function used in the paper (WGAN + AC-GAN).
+
+def G_wgan_acgan(G, D, opt, training_set, minibatch_size,
+    cond_weight = 1.0): # Weight of the conditioning term.
+
+    latents = tf.random_normal([minibatch_size] + G.input_shapes[0][1:])
+    labels = training_set.get_random_labels_tf(minibatch_size)
+    fake_images_out = G.get_output_for(latents, labels, is_training=True)
+    fake_scores_out, fake_labels_out = fp32(D.get_output_for(fake_images_out, is_training=True))
+    loss = -fake_scores_out
+
+    if D.output_shapes[1][1] > 0:
+        with tf.name_scope('LabelPenalty'):
+            label_penalty_fakes = tf.nn.softmax_cross_entropy_with_logits_v2(labels=labels, logits=fake_labels_out)
+        loss += label_penalty_fakes * cond_weight
+    return loss
+
+#----------------------------------------------------------------------------
+# Discriminator loss function used in the paper (WGAN-GP + AC-GAN).
+
+def D_wgangp_acgan(G, D, opt, training_set, minibatch_size, reals, labels,
+    wgan_lambda     = 10.0,     # Weight for the gradient penalty term.
+    wgan_epsilon    = 0.001,    # Weight for the epsilon term, \epsilon_{drift}.
+    wgan_target     = 1.0,      # Target value for gradient magnitudes.
+    cond_weight     = 1.0):     # Weight of the conditioning terms.
+
+    latents = tf.random_normal([minibatch_size] + G.input_shapes[0][1:])
+    fake_images_out = G.get_output_for(latents, labels, is_training=True)
+    real_scores_out, real_labels_out = fp32(D.get_output_for(reals, is_training=True))
+    fake_scores_out, fake_labels_out = fp32(D.get_output_for(fake_images_out, is_training=True))
+    real_scores_out = tfutil.autosummary('Loss/real_scores', real_scores_out)
+    fake_scores_out = tfutil.autosummary('Loss/fake_scores', fake_scores_out)
+    loss = fake_scores_out - real_scores_out
+
+    with tf.name_scope('GradientPenalty'):
+        mixing_factors = tf.random_uniform([minibatch_size, 1, 1, 1], 0.0, 1.0, dtype=fake_images_out.dtype)
+        mixed_images_out = tfutil.lerp(tf.cast(reals, fake_images_out.dtype), fake_images_out, mixing_factors)
+        mixed_scores_out, mixed_labels_out = fp32(D.get_output_for(mixed_images_out, is_training=True))
+        mixed_scores_out = tfutil.autosummary('Loss/mixed_scores', mixed_scores_out)
+        mixed_loss = opt.apply_loss_scaling(tf.reduce_sum(mixed_scores_out))
+        mixed_grads = opt.undo_loss_scaling(fp32(tf.gradients(mixed_loss, [mixed_images_out])[0]))
+        mixed_norms = tf.sqrt(tf.reduce_sum(tf.square(mixed_grads), axis=[1,2,3]))
+        mixed_norms = tfutil.autosummary('Loss/mixed_norms', mixed_norms)
+        gradient_penalty = tf.square(mixed_norms - wgan_target)
+    loss += gradient_penalty * (wgan_lambda / (wgan_target**2))
+
+    with tf.name_scope('EpsilonPenalty'):
+        epsilon_penalty = tfutil.autosummary('Loss/epsilon_penalty', tf.square(real_scores_out))
+    loss += epsilon_penalty * wgan_epsilon
+
+    if D.output_shapes[1][1] > 0:
+        with tf.name_scope('LabelPenalty'):
+            label_penalty_reals = tf.nn.softmax_cross_entropy_with_logits_v2(labels=labels, logits=real_labels_out)
+            label_penalty_fakes = tf.nn.softmax_cross_entropy_with_logits_v2(labels=labels, logits=fake_labels_out)
+            label_penalty_reals = tfutil.autosummary('Loss/label_penalty_reals', label_penalty_reals)
+            label_penalty_fakes = tfutil.autosummary('Loss/label_penalty_fakes', label_penalty_fakes)
+        loss += (label_penalty_reals + label_penalty_fakes) * cond_weight
+    return loss
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/metrics/__init__.py

@@ -0,0 +1 @@
+# empty

models/pggan_tf_official/metrics/frechet_inception_distance.py

@@ -0,0 +1,281 @@
+#!/usr/bin/env python3
+#
+# Copyright 2017 Martin Heusel
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Adapted from the original implementation by Martin Heusel.
+# Source https://github.com/bioinf-jku/TTUR/blob/master/fid.py
+
+''' Calculates the Frechet Inception Distance (FID) to evalulate GANs.
+
+The FID metric calculates the distance between two distributions of images.
+Typically, we have summary statistics (mean & covariance matrix) of one
+of these distributions, while the 2nd distribution is given by a GAN.
+
+When run as a stand-alone program, it compares the distribution of
+images that are stored as PNG/JPEG at a specified location with a
+distribution given by summary statistics (in pickle format).
+
+The FID is calculated by assuming that X_1 and X_2 are the activations of
+the pool_3 layer of the inception net for generated samples and real world
+samples respectivly.
+
+See --help to see further details.
+'''
+
+from __future__ import absolute_import, division, print_function
+import numpy as np
+import scipy as sp
+import os
+import gzip, pickle
+import tensorflow as tf
+from scipy.misc import imread
+import pathlib
+import urllib
+
+
+class InvalidFIDException(Exception):
+    pass
+
+
+def create_inception_graph(pth):
+    """Creates a graph from saved GraphDef file."""
+    # Creates graph from saved graph_def.pb.
+    with tf.gfile.FastGFile( pth, 'rb') as f:
+        graph_def = tf.GraphDef()
+        graph_def.ParseFromString( f.read())
+        _ = tf.import_graph_def( graph_def, name='FID_Inception_Net')
+#-------------------------------------------------------------------------------
+
+
+# code for handling inception net derived from
+#   https://github.com/openai/improved-gan/blob/master/inception_score/model.py
+def _get_inception_layer(sess):
+    """Prepares inception net for batched usage and returns pool_3 layer. """
+    layername = 'FID_Inception_Net/pool_3:0'
+    pool3 = sess.graph.get_tensor_by_name(layername)
+    ops = pool3.graph.get_operations()
+    for op_idx, op in enumerate(ops):
+        for o in op.outputs:
+            shape = o.get_shape()
+            if shape._dims is not None:
+              shape = [s.value for s in shape]
+              new_shape = []
+              for j, s in enumerate(shape):
+                if s == 1 and j == 0:
+                  new_shape.append(None)
+                else:
+                  new_shape.append(s)
+              try:
+                o._shape = tf.TensorShape(new_shape)
+              except ValueError:
+                o._shape_val = tf.TensorShape(new_shape) # EDIT: added for compatibility with tensorflow 1.6.0
+    return pool3
+#-------------------------------------------------------------------------------
+
+
+def get_activations(images, sess, batch_size=50, verbose=False):
+    """Calculates the activations of the pool_3 layer for all images.
+
+    Params:
+    -- images      : Numpy array of dimension (n_images, hi, wi, 3). The values
+                     must lie between 0 and 256.
+    -- sess        : current session
+    -- batch_size  : the images numpy array is split into batches with batch size
+                     batch_size. A reasonable batch size depends on the disposable hardware.
+    -- verbose    : If set to True and parameter out_step is given, the number of calculated
+                     batches is reported.
+    Returns:
+    -- A numpy array of dimension (num images, 2048) that contains the
+       activations of the given tensor when feeding inception with the query tensor.
+    """
+    inception_layer = _get_inception_layer(sess)
+    d0 = images.shape[0]
+    if batch_size > d0:
+        print("warning: batch size is bigger than the data size. setting batch size to data size")
+        batch_size = d0
+    n_batches = d0//batch_size
+    n_used_imgs = n_batches*batch_size
+    pred_arr = np.empty((n_used_imgs,2048))
+    for i in range(n_batches):
+        if verbose:
+            print("\rPropagating batch %d/%d" % (i+1, n_batches), end="", flush=True)
+        start = i*batch_size
+        end = start + batch_size
+        batch = images[start:end]
+        pred = sess.run(inception_layer, {'FID_Inception_Net/ExpandDims:0': batch})
+        pred_arr[start:end] = pred.reshape(batch_size,-1)
+    if verbose:
+        print(" done")
+    return pred_arr
+#-------------------------------------------------------------------------------
+
+
+def calculate_frechet_distance(mu1, sigma1, mu2, sigma2):
+    """Numpy implementation of the Frechet Distance.
+    The Frechet distance between two multivariate Gaussians X_1 ~ N(mu_1, C_1)
+    and X_2 ~ N(mu_2, C_2) is
+            d^2 = ||mu_1 - mu_2||^2 + Tr(C_1 + C_2 - 2*sqrt(C_1*C_2)).
+
+    Params:
+    -- mu1 : Numpy array containing the activations of the pool_3 layer of the
+             inception net ( like returned by the function 'get_predictions')
+    -- mu2   : The sample mean over activations of the pool_3 layer, precalcualted
+               on an representive data set.
+    -- sigma2: The covariance matrix over activations of the pool_3 layer,
+               precalcualted on an representive data set.
+
+    Returns:
+    -- dist  : The Frechet Distance.
+
+    Raises:
+    -- InvalidFIDException if nan occures.
+    """
+    m = np.square(mu1 - mu2).sum()
+    #s = sp.linalg.sqrtm(np.dot(sigma1, sigma2)) # EDIT: commented out
+    s, _ = sp.linalg.sqrtm(np.dot(sigma1, sigma2), disp=False) # EDIT: added
+    dist = m + np.trace(sigma1+sigma2 - 2*s)
+    #if np.isnan(dist): # EDIT: commented out
+    #    raise InvalidFIDException("nan occured in distance calculation.") # EDIT: commented out
+    #return dist # EDIT: commented out
+    return np.real(dist) # EDIT: added
+#-------------------------------------------------------------------------------
+
+
+def calculate_activation_statistics(images, sess, batch_size=50, verbose=False):
+    """Calculation of the statistics used by the FID.
+    Params:
+    -- images      : Numpy array of dimension (n_images, hi, wi, 3). The values
+                     must lie between 0 and 255.
+    -- sess        : current session
+    -- batch_size  : the images numpy array is split into batches with batch size
+                     batch_size. A reasonable batch size depends on the available hardware.
+    -- verbose     : If set to True and parameter out_step is given, the number of calculated
+                     batches is reported.
+    Returns:
+    -- mu    : The mean over samples of the activations of the pool_3 layer of
+               the incption model.
+    -- sigma : The covariance matrix of the activations of the pool_3 layer of
+               the incption model.
+    """
+    act = get_activations(images, sess, batch_size, verbose)
+    mu = np.mean(act, axis=0)
+    sigma = np.cov(act, rowvar=False)
+    return mu, sigma
+#-------------------------------------------------------------------------------
+
+
+#-------------------------------------------------------------------------------
+# The following functions aren't needed for calculating the FID
+# they're just here to make this module work as a stand-alone script
+# for calculating FID scores
+#-------------------------------------------------------------------------------
+def check_or_download_inception(inception_path):
+    ''' Checks if the path to the inception file is valid, or downloads
+        the file if it is not present. '''
+    INCEPTION_URL = 'http://download.tensorflow.org/models/image/imagenet/inception-2015-12-05.tgz'
+    if inception_path is None:
+        inception_path = '/tmp'
+    inception_path = pathlib.Path(inception_path)
+    model_file = inception_path / 'classify_image_graph_def.pb'
+    if not model_file.exists():
+        print("Downloading Inception model")
+        from urllib import request
+        import tarfile
+        fn, _ = request.urlretrieve(INCEPTION_URL)
+        with tarfile.open(fn, mode='r') as f:
+            f.extract('classify_image_graph_def.pb', str(model_file.parent))
+    return str(model_file)
+
+
+def _handle_path(path, sess):
+    if path.endswith('.npz'):
+        f = np.load(path)
+        m, s = f['mu'][:], f['sigma'][:]
+        f.close()
+    else:
+        path = pathlib.Path(path)
+        files = list(path.glob('*.jpg')) + list(path.glob('*.png'))
+        x = np.array([imread(str(fn)).astype(np.float32) for fn in files])
+        m, s = calculate_activation_statistics(x, sess)
+    return m, s
+
+
+def calculate_fid_given_paths(paths, inception_path):
+    ''' Calculates the FID of two paths. '''
+    inception_path = check_or_download_inception(inception_path)
+
+    for p in paths:
+        if not os.path.exists(p):
+            raise RuntimeError("Invalid path: %s" % p)
+
+    create_inception_graph(str(inception_path))
+    with tf.Session() as sess:
+        sess.run(tf.global_variables_initializer())
+        m1, s1 = _handle_path(paths[0], sess)
+        m2, s2 = _handle_path(paths[1], sess)
+        fid_value = calculate_frechet_distance(m1, s1, m2, s2)
+        return fid_value
+
+
+if __name__ == "__main__":
+    from argparse import ArgumentParser, ArgumentDefaultsHelpFormatter
+    parser = ArgumentParser(formatter_class=ArgumentDefaultsHelpFormatter)
+    parser.add_argument("path", type=str, nargs=2,
+        help='Path to the generated images or to .npz statistic files')
+    parser.add_argument("-i", "--inception", type=str, default=None,
+        help='Path to Inception model (will be downloaded if not provided)')
+    parser.add_argument("--gpu", default="", type=str,
+        help='GPU to use (leave blank for CPU only)')
+    args = parser.parse_args()
+    os.environ['CUDA_VISIBLE_DEVICES'] = args.gpu
+    fid_value = calculate_fid_given_paths(args.path, args.inception)
+    print("FID: ", fid_value)
+
+#----------------------------------------------------------------------------
+# EDIT: added
+
+class API:
+    def __init__(self, num_images, image_shape, image_dtype, minibatch_size):
+        import config
+        self.network_dir = os.path.join(config.result_dir, '_inception_fid')
+        self.network_file = check_or_download_inception(self.network_dir)
+        self.sess = tf.get_default_session()
+        create_inception_graph(self.network_file)
+
+    def get_metric_names(self):
+        return ['FID']
+
+    def get_metric_formatting(self):
+        return ['%-10.4f']
+
+    def begin(self, mode):
+        assert mode in ['warmup', 'reals', 'fakes']
+        self.activations = []
+
+    def feed(self, mode, minibatch):
+        act = get_activations(minibatch.transpose(0,2,3,1), self.sess, batch_size=minibatch.shape[0])
+        self.activations.append(act)
+
+    def end(self, mode):
+        act = np.concatenate(self.activations)
+        mu = np.mean(act, axis=0)
+        sigma = np.cov(act, rowvar=False)
+        if mode in ['warmup', 'reals']:
+            self.mu_real = mu
+            self.sigma_real = sigma
+        fid = calculate_frechet_distance(mu, sigma, self.mu_real, self.sigma_real)
+        return [fid]
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/metrics/inception_score.py

@@ -0,0 +1,147 @@
+# Copyright 2016 Wojciech Zaremba
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Adapted from the original implementation by Wojciech Zaremba.
+# Source: https://github.com/openai/improved-gan/blob/master/inception_score/model.py
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import os.path
+import sys
+import tarfile
+
+import numpy as np
+from six.moves import urllib
+import tensorflow as tf
+import glob
+import scipy.misc
+import math
+import sys
+
+MODEL_DIR = '/tmp/imagenet'
+
+DATA_URL = 'http://download.tensorflow.org/models/image/imagenet/inception-2015-12-05.tgz'
+softmax = None
+
+# Call this function with list of images. Each of elements should be a 
+# numpy array with values ranging from 0 to 255.
+def get_inception_score(images, splits=10):
+  assert(type(images) == list)
+  assert(type(images[0]) == np.ndarray)
+  assert(len(images[0].shape) == 3)
+  #assert(np.max(images[0]) > 10) # EDIT: commented out
+  #assert(np.min(images[0]) >= 0.0)
+  inps = []
+  for img in images:
+    img = img.astype(np.float32)
+    inps.append(np.expand_dims(img, 0))
+  bs = 100
+  with tf.Session() as sess:
+    preds = []
+    n_batches = int(math.ceil(float(len(inps)) / float(bs)))
+    for i in range(n_batches):
+        #sys.stdout.write(".") # EDIT: commented out
+        #sys.stdout.flush()
+        inp = inps[(i * bs):min((i + 1) * bs, len(inps))]
+        inp = np.concatenate(inp, 0)
+        pred = sess.run(softmax, {'ExpandDims:0': inp})
+        preds.append(pred)
+    preds = np.concatenate(preds, 0)
+    scores = []
+    for i in range(splits):
+      part = preds[(i * preds.shape[0] // splits):((i + 1) * preds.shape[0] // splits), :]
+      kl = part * (np.log(part) - np.log(np.expand_dims(np.mean(part, 0), 0)))
+      kl = np.mean(np.sum(kl, 1))
+      scores.append(np.exp(kl))
+    return np.mean(scores), np.std(scores)
+
+# This function is called automatically.
+def _init_inception():
+  global softmax
+  if not os.path.exists(MODEL_DIR):
+    os.makedirs(MODEL_DIR)
+  filename = DATA_URL.split('/')[-1]
+  filepath = os.path.join(MODEL_DIR, filename)
+  if not os.path.exists(filepath):
+    def _progress(count, block_size, total_size):
+      sys.stdout.write('\r>> Downloading %s %.1f%%' % (
+          filename, float(count * block_size) / float(total_size) * 100.0))
+      sys.stdout.flush()
+    filepath, _ = urllib.request.urlretrieve(DATA_URL, filepath, _progress)
+    print()
+    statinfo = os.stat(filepath)
+    print('Succesfully downloaded', filename, statinfo.st_size, 'bytes.')
+    tarfile.open(filepath, 'r:gz').extractall(MODEL_DIR) # EDIT: increased indent
+  with tf.gfile.FastGFile(os.path.join(
+      MODEL_DIR, 'classify_image_graph_def.pb'), 'rb') as f:
+    graph_def = tf.GraphDef()
+    graph_def.ParseFromString(f.read())
+    _ = tf.import_graph_def(graph_def, name='')
+  # Works with an arbitrary minibatch size.
+  with tf.Session() as sess:
+    pool3 = sess.graph.get_tensor_by_name('pool_3:0')
+    ops = pool3.graph.get_operations()
+    for op_idx, op in enumerate(ops):
+        for o in op.outputs:
+            shape = o.get_shape()
+            shape = [s.value for s in shape]
+            new_shape = []
+            for j, s in enumerate(shape):
+                if s == 1 and j == 0:
+                    new_shape.append(None)
+                else:
+                    new_shape.append(s)
+            try:
+                o._shape = tf.TensorShape(new_shape)
+            except ValueError:
+                o._shape_val = tf.TensorShape(new_shape) # EDIT: added for compatibility with tensorflow 1.6.0
+    w = sess.graph.get_operation_by_name("softmax/logits/MatMul").inputs[1]
+    logits = tf.matmul(tf.squeeze(pool3), w)
+    softmax = tf.nn.softmax(logits)
+
+#if softmax is None: # EDIT: commented out
+#  _init_inception() # EDIT: commented out
+
+#----------------------------------------------------------------------------
+# EDIT: added
+
+class API:
+    def __init__(self, num_images, image_shape, image_dtype, minibatch_size):
+        import config
+        globals()['MODEL_DIR'] = os.path.join(config.result_dir, '_inception')
+        self.sess = tf.get_default_session()
+        _init_inception()
+
+    def get_metric_names(self):
+        return ['IS_mean', 'IS_std']
+
+    def get_metric_formatting(self):
+        return ['%-10.4f', '%-10.4f']
+
+    def begin(self, mode):
+        assert mode in ['warmup', 'reals', 'fakes']
+        self.images = []
+
+    def feed(self, mode, minibatch):
+        self.images.append(minibatch.transpose(0, 2, 3, 1))
+
+    def end(self, mode):
+        images = list(np.concatenate(self.images))
+        with self.sess.as_default():
+            mean, std = get_inception_score(images)
+        return [mean, std]
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/metrics/ms_ssim.py

@@ -0,0 +1,200 @@
+#!/usr/bin/python
+#
+# Copyright 2016 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+
+# Adapted from the original implementation by The TensorFlow Authors.
+# Source: https://github.com/tensorflow/models/blob/master/research/compression/image_encoder/msssim.py
+
+import numpy as np
+from scipy import signal
+from scipy.ndimage.filters import convolve
+
+def _FSpecialGauss(size, sigma):
+    """Function to mimic the 'fspecial' gaussian MATLAB function."""
+    radius = size // 2
+    offset = 0.0
+    start, stop = -radius, radius + 1
+    if size % 2 == 0:
+        offset = 0.5
+        stop -= 1
+    x, y = np.mgrid[offset + start:stop, offset + start:stop]
+    assert len(x) == size
+    g = np.exp(-((x**2 + y**2)/(2.0 * sigma**2)))
+    return g / g.sum()
+
+def _SSIMForMultiScale(img1, img2, max_val=255, filter_size=11, filter_sigma=1.5, k1=0.01, k2=0.03):
+    """Return the Structural Similarity Map between `img1` and `img2`.
+
+    This function attempts to match the functionality of ssim_index_new.m by
+    Zhou Wang: http://www.cns.nyu.edu/~lcv/ssim/msssim.zip
+
+    Arguments:
+        img1: Numpy array holding the first RGB image batch.
+        img2: Numpy array holding the second RGB image batch.
+        max_val: the dynamic range of the images (i.e., the difference between the
+            maximum the and minimum allowed values).
+        filter_size: Size of blur kernel to use (will be reduced for small images).
+        filter_sigma: Standard deviation for Gaussian blur kernel (will be reduced
+            for small images).
+        k1: Constant used to maintain stability in the SSIM calculation (0.01 in
+            the original paper).
+        k2: Constant used to maintain stability in the SSIM calculation (0.03 in
+            the original paper).
+
+    Returns:
+        Pair containing the mean SSIM and contrast sensitivity between `img1` and
+        `img2`.
+
+    Raises:
+        RuntimeError: If input images don't have the same shape or don't have four
+            dimensions: [batch_size, height, width, depth].
+    """
+    if img1.shape != img2.shape:
+        raise RuntimeError('Input images must have the same shape (%s vs. %s).' % (img1.shape, img2.shape))
+    if img1.ndim != 4:
+        raise RuntimeError('Input images must have four dimensions, not %d' % img1.ndim)
+
+    img1 = img1.astype(np.float32)
+    img2 = img2.astype(np.float32)
+    _, height, width, _ = img1.shape
+
+    # Filter size can't be larger than height or width of images.
+    size = min(filter_size, height, width)
+
+    # Scale down sigma if a smaller filter size is used.
+    sigma = size * filter_sigma / filter_size if filter_size else 0
+
+    if filter_size:
+        window = np.reshape(_FSpecialGauss(size, sigma), (1, size, size, 1))
+        mu1 = signal.fftconvolve(img1, window, mode='valid')
+        mu2 = signal.fftconvolve(img2, window, mode='valid')
+        sigma11 = signal.fftconvolve(img1 * img1, window, mode='valid')
+        sigma22 = signal.fftconvolve(img2 * img2, window, mode='valid')
+        sigma12 = signal.fftconvolve(img1 * img2, window, mode='valid')
+    else:
+        # Empty blur kernel so no need to convolve.
+        mu1, mu2 = img1, img2
+        sigma11 = img1 * img1
+        sigma22 = img2 * img2
+        sigma12 = img1 * img2
+
+    mu11 = mu1 * mu1
+    mu22 = mu2 * mu2
+    mu12 = mu1 * mu2
+    sigma11 -= mu11
+    sigma22 -= mu22
+    sigma12 -= mu12
+
+    # Calculate intermediate values used by both ssim and cs_map.
+    c1 = (k1 * max_val) ** 2
+    c2 = (k2 * max_val) ** 2
+    v1 = 2.0 * sigma12 + c2
+    v2 = sigma11 + sigma22 + c2
+    ssim = np.mean((((2.0 * mu12 + c1) * v1) / ((mu11 + mu22 + c1) * v2)), axis=(1, 2, 3)) # Return for each image individually.
+    cs = np.mean(v1 / v2, axis=(1, 2, 3))
+    return ssim, cs
+
+def _HoxDownsample(img):
+    return (img[:, 0::2, 0::2, :] + img[:, 1::2, 0::2, :] + img[:, 0::2, 1::2, :] + img[:, 1::2, 1::2, :]) * 0.25
+
+def msssim(img1, img2, max_val=255, filter_size=11, filter_sigma=1.5, k1=0.01, k2=0.03, weights=None):
+    """Return the MS-SSIM score between `img1` and `img2`.
+
+    This function implements Multi-Scale Structural Similarity (MS-SSIM) Image
+    Quality Assessment according to Zhou Wang's paper, "Multi-scale structural
+    similarity for image quality assessment" (2003).
+    Link: https://ece.uwaterloo.ca/~z70wang/publications/msssim.pdf
+
+    Author's MATLAB implementation:
+    http://www.cns.nyu.edu/~lcv/ssim/msssim.zip
+
+    Arguments:
+        img1: Numpy array holding the first RGB image batch.
+        img2: Numpy array holding the second RGB image batch.
+        max_val: the dynamic range of the images (i.e., the difference between the
+            maximum the and minimum allowed values).
+        filter_size: Size of blur kernel to use (will be reduced for small images).
+        filter_sigma: Standard deviation for Gaussian blur kernel (will be reduced
+            for small images).
+        k1: Constant used to maintain stability in the SSIM calculation (0.01 in
+            the original paper).
+        k2: Constant used to maintain stability in the SSIM calculation (0.03 in
+            the original paper).
+        weights: List of weights for each level; if none, use five levels and the
+            weights from the original paper.
+
+    Returns:
+        MS-SSIM score between `img1` and `img2`.
+
+    Raises:
+        RuntimeError: If input images don't have the same shape or don't have four
+            dimensions: [batch_size, height, width, depth].
+    """
+    if img1.shape != img2.shape:
+        raise RuntimeError('Input images must have the same shape (%s vs. %s).' % (img1.shape, img2.shape))
+    if img1.ndim != 4:
+        raise RuntimeError('Input images must have four dimensions, not %d' % img1.ndim)
+
+    # Note: default weights don't sum to 1.0 but do match the paper / matlab code.
+    weights = np.array(weights if weights else [0.0448, 0.2856, 0.3001, 0.2363, 0.1333])
+    levels = weights.size
+    downsample_filter = np.ones((1, 2, 2, 1)) / 4.0
+    im1, im2 = [x.astype(np.float32) for x in [img1, img2]]
+    mssim = []
+    mcs = []
+    for _ in range(levels):
+        ssim, cs = _SSIMForMultiScale(
+                im1, im2, max_val=max_val, filter_size=filter_size,
+                filter_sigma=filter_sigma, k1=k1, k2=k2)
+        mssim.append(ssim)
+        mcs.append(cs)
+        im1, im2 = [_HoxDownsample(x) for x in [im1, im2]]
+
+    # Clip to zero. Otherwise we get NaNs.
+    mssim = np.clip(np.asarray(mssim), 0.0, np.inf)
+    mcs = np.clip(np.asarray(mcs), 0.0, np.inf)
+
+    # Average over images only at the end.
+    return np.mean(np.prod(mcs[:-1, :] ** weights[:-1, np.newaxis], axis=0) * (mssim[-1, :] ** weights[-1]))
+
+#----------------------------------------------------------------------------
+# EDIT: added
+
+class API:
+    def __init__(self, num_images, image_shape, image_dtype, minibatch_size):
+        assert num_images % 2 == 0 and minibatch_size % 2 == 0
+        self.num_pairs = num_images // 2
+
+    def get_metric_names(self):
+        return ['MS-SSIM']
+
+    def get_metric_formatting(self):
+        return ['%-10.4f']
+
+    def begin(self, mode):
+        assert mode in ['warmup', 'reals', 'fakes']
+        self.sum = 0.0
+
+    def feed(self, mode, minibatch):
+        images = minibatch.transpose(0, 2, 3, 1)
+        score = msssim(images[0::2], images[1::2])
+        self.sum += score * (images.shape[0] // 2)
+
+    def end(self, mode):
+        avg = self.sum / self.num_pairs
+        return [avg]
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/metrics/sliced_wasserstein.py

@@ -0,0 +1,135 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import numpy as np
+import scipy.ndimage
+
+#----------------------------------------------------------------------------
+
+def get_descriptors_for_minibatch(minibatch, nhood_size, nhoods_per_image):
+    S = minibatch.shape # (minibatch, channel, height, width)
+    assert len(S) == 4 and S[1] == 3
+    N = nhoods_per_image * S[0]
+    H = nhood_size // 2
+    nhood, chan, x, y = np.ogrid[0:N, 0:3, -H:H+1, -H:H+1]
+    img = nhood // nhoods_per_image
+    x = x + np.random.randint(H, S[3] - H, size=(N, 1, 1, 1))
+    y = y + np.random.randint(H, S[2] - H, size=(N, 1, 1, 1))
+    idx = ((img * S[1] + chan) * S[2] + y) * S[3] + x
+    return minibatch.flat[idx]
+
+#----------------------------------------------------------------------------
+
+def finalize_descriptors(desc):
+    if isinstance(desc, list):
+        desc = np.concatenate(desc, axis=0)
+    assert desc.ndim == 4 # (neighborhood, channel, height, width)
+    desc -= np.mean(desc, axis=(0, 2, 3), keepdims=True)
+    desc /= np.std(desc, axis=(0, 2, 3), keepdims=True)
+    desc = desc.reshape(desc.shape[0], -1)
+    return desc
+
+#----------------------------------------------------------------------------
+
+def sliced_wasserstein(A, B, dir_repeats, dirs_per_repeat):
+    assert A.ndim == 2 and A.shape == B.shape                           # (neighborhood, descriptor_component)
+    results = []
+    for repeat in range(dir_repeats):
+        dirs = np.random.randn(A.shape[1], dirs_per_repeat)             # (descriptor_component, direction)
+        dirs /= np.sqrt(np.sum(np.square(dirs), axis=0, keepdims=True)) # normalize descriptor components for each direction
+        dirs = dirs.astype(np.float32)
+        projA = np.matmul(A, dirs)                                      # (neighborhood, direction)
+        projB = np.matmul(B, dirs)
+        projA = np.sort(projA, axis=0)                                  # sort neighborhood projections for each direction
+        projB = np.sort(projB, axis=0)
+        dists = np.abs(projA - projB)                                   # pointwise wasserstein distances
+        results.append(np.mean(dists))                                  # average over neighborhoods and directions
+    return np.mean(results)                                             # average over repeats
+
+#----------------------------------------------------------------------------
+
+def downscale_minibatch(minibatch, lod):
+    if lod == 0:
+        return minibatch
+    t = minibatch.astype(np.float32)
+    for i in range(lod):
+        t = (t[:, :, 0::2, 0::2] + t[:, :, 0::2, 1::2] + t[:, :, 1::2, 0::2] + t[:, :, 1::2, 1::2]) * 0.25
+    return np.round(t).clip(0, 255).astype(np.uint8)
+
+#----------------------------------------------------------------------------
+
+gaussian_filter = np.float32([
+    [1, 4,  6,  4,  1],
+    [4, 16, 24, 16, 4],
+    [6, 24, 36, 24, 6],
+    [4, 16, 24, 16, 4],
+    [1, 4,  6,  4,  1]]) / 256.0
+
+def pyr_down(minibatch): # matches cv2.pyrDown()
+    assert minibatch.ndim == 4
+    return scipy.ndimage.convolve(minibatch, gaussian_filter[np.newaxis, np.newaxis, :, :], mode='mirror')[:, :, ::2, ::2]
+
+def pyr_up(minibatch): # matches cv2.pyrUp()
+    assert minibatch.ndim == 4
+    S = minibatch.shape
+    res = np.zeros((S[0], S[1], S[2] * 2, S[3] * 2), minibatch.dtype)
+    res[:, :, ::2, ::2] = minibatch
+    return scipy.ndimage.convolve(res, gaussian_filter[np.newaxis, np.newaxis, :, :] * 4.0, mode='mirror')
+
+def generate_laplacian_pyramid(minibatch, num_levels):
+    pyramid = [np.float32(minibatch)]
+    for i in range(1, num_levels):
+        pyramid.append(pyr_down(pyramid[-1]))
+        pyramid[-2] -= pyr_up(pyramid[-1])
+    return pyramid
+
+def reconstruct_laplacian_pyramid(pyramid):
+    minibatch = pyramid[-1]
+    for level in pyramid[-2::-1]:
+        minibatch = pyr_up(minibatch) + level
+    return minibatch
+
+#----------------------------------------------------------------------------
+
+class API:
+    def __init__(self, num_images, image_shape, image_dtype, minibatch_size):
+        self.nhood_size         = 7
+        self.nhoods_per_image   = 128
+        self.dir_repeats        = 4
+        self.dirs_per_repeat    = 128
+        self.resolutions = []
+        res = image_shape[1]
+        while res >= 16:
+            self.resolutions.append(res)
+            res //= 2
+
+    def get_metric_names(self):
+        return ['SWDx1e3_%d' % res for res in self.resolutions] + ['SWDx1e3_avg']
+
+    def get_metric_formatting(self):
+        return ['%-13.4f'] * len(self.get_metric_names())
+
+    def begin(self, mode):
+        assert mode in ['warmup', 'reals', 'fakes']
+        self.descriptors = [[] for res in self.resolutions]
+
+    def feed(self, mode, minibatch):
+        for lod, level in enumerate(generate_laplacian_pyramid(minibatch, len(self.resolutions))):
+            desc = get_descriptors_for_minibatch(level, self.nhood_size, self.nhoods_per_image)
+            self.descriptors[lod].append(desc)
+
+    def end(self, mode):
+        desc = [finalize_descriptors(d) for d in self.descriptors]
+        del self.descriptors
+        if mode in ['warmup', 'reals']:
+            self.desc_real = desc
+        dist = [sliced_wasserstein(dreal, dfake, self.dir_repeats, self.dirs_per_repeat) for dreal, dfake in zip(self.desc_real, desc)]
+        del desc
+        dist = [d * 1e3 for d in dist] # multiply by 10^3
+        return dist + [np.mean(dist)]
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/misc.py

@@ -0,0 +1,344 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import os
+import sys
+import glob
+import datetime
+import pickle
+import re
+import numpy as np
+from collections import OrderedDict 
+import scipy.ndimage
+import PIL.Image
+
+import config
+import dataset
+import legacy
+
+#----------------------------------------------------------------------------
+# Convenience wrappers for pickle that are able to load data produced by
+# older versions of the code.
+
+def load_pkl(filename):
+    with open(filename, 'rb') as file:
+        return legacy.LegacyUnpickler(file, encoding='latin1').load()
+
+def save_pkl(obj, filename):
+    with open(filename, 'wb') as file:
+        pickle.dump(obj, file, protocol=pickle.HIGHEST_PROTOCOL)
+
+#----------------------------------------------------------------------------
+# Image utils.
+
+def adjust_dynamic_range(data, drange_in, drange_out):
+    if drange_in != drange_out:
+        scale = (np.float32(drange_out[1]) - np.float32(drange_out[0])) / (np.float32(drange_in[1]) - np.float32(drange_in[0]))
+        bias = (np.float32(drange_out[0]) - np.float32(drange_in[0]) * scale)
+        data = data * scale + bias
+    return data
+
+def create_image_grid(images, grid_size=None):
+    assert images.ndim == 3 or images.ndim == 4
+    num, img_w, img_h = images.shape[0], images.shape[-1], images.shape[-2]
+
+    if grid_size is not None:
+        grid_w, grid_h = tuple(grid_size)
+    else:
+        grid_w = max(int(np.ceil(np.sqrt(num))), 1)
+        grid_h = max((num - 1) // grid_w + 1, 1)
+
+    grid = np.zeros(list(images.shape[1:-2]) + [grid_h * img_h, grid_w * img_w], dtype=images.dtype)
+    for idx in range(num):
+        x = (idx % grid_w) * img_w
+        y = (idx // grid_w) * img_h
+        grid[..., y : y + img_h, x : x + img_w] = images[idx]
+    return grid
+
+def convert_to_pil_image(image, drange=[0,1]):
+    assert image.ndim == 2 or image.ndim == 3
+    if image.ndim == 3:
+        if image.shape[0] == 1:
+            image = image[0] # grayscale CHW => HW
+        else:
+            image = image.transpose(1, 2, 0) # CHW -> HWC
+
+    image = adjust_dynamic_range(image, drange, [0,255])
+    image = np.rint(image).clip(0, 255).astype(np.uint8)
+    format = 'RGB' if image.ndim == 3 else 'L'
+    return PIL.Image.fromarray(image, format)
+
+def save_image(image, filename, drange=[0,1], quality=95):
+    img = convert_to_pil_image(image, drange)
+    if '.jpg' in filename:
+        img.save(filename,"JPEG", quality=quality, optimize=True)
+    else:
+        img.save(filename)
+
+def save_image_grid(images, filename, drange=[0,1], grid_size=None):
+    convert_to_pil_image(create_image_grid(images, grid_size), drange).save(filename)
+
+#----------------------------------------------------------------------------
+# Logging of stdout and stderr to a file.
+
+class OutputLogger(object):
+    def __init__(self):
+        self.file = None
+        self.buffer = ''
+
+    def set_log_file(self, filename, mode='wt'):
+        assert self.file is None
+        self.file = open(filename, mode)
+        if self.buffer is not None:
+            self.file.write(self.buffer)
+            self.buffer = None
+
+    def write(self, data):
+        if self.file is not None:
+            self.file.write(data)
+        if self.buffer is not None:
+            self.buffer += data
+
+    def flush(self):
+        if self.file is not None:
+            self.file.flush()
+
+class TeeOutputStream(object):
+    def __init__(self, child_streams, autoflush=False):
+        self.child_streams = child_streams
+        self.autoflush = autoflush
+ 
+    def write(self, data):
+        for stream in self.child_streams:
+            stream.write(data)
+        if self.autoflush:
+            self.flush()
+
+    def flush(self):
+        for stream in self.child_streams:
+            stream.flush()
+
+output_logger = None
+
+def init_output_logging():
+    global output_logger
+    if output_logger is None:
+        output_logger = OutputLogger()
+        sys.stdout = TeeOutputStream([sys.stdout, output_logger], autoflush=True)
+        sys.stderr = TeeOutputStream([sys.stderr, output_logger], autoflush=True)
+
+def set_output_log_file(filename, mode='wt'):
+    if output_logger is not None:
+        output_logger.set_log_file(filename, mode)
+
+#----------------------------------------------------------------------------
+# Reporting results.
+
+def create_result_subdir(result_dir, desc):
+
+    # Select run ID and create subdir.
+    while True:
+        run_id = 0
+        for fname in glob.glob(os.path.join(result_dir, '*')):
+            try:
+                fbase = os.path.basename(fname)
+                ford = int(fbase[:fbase.find('-')])
+                run_id = max(run_id, ford + 1)
+            except ValueError:
+                pass
+
+        result_subdir = os.path.join(result_dir, '%03d-%s' % (run_id, desc))
+        try:
+            os.makedirs(result_subdir)
+            break
+        except OSError:
+            if os.path.isdir(result_subdir):
+                continue
+            raise
+
+    print("Saving results to", result_subdir)
+    set_output_log_file(os.path.join(result_subdir, 'log.txt'))
+
+    # Export config.
+    try:
+        with open(os.path.join(result_subdir, 'config.txt'), 'wt') as fout:
+            for k, v in sorted(config.__dict__.items()):
+                if not k.startswith('_'):
+                    fout.write("%s = %s\n" % (k, str(v)))
+    except:
+        pass
+
+    return result_subdir
+
+def format_time(seconds):
+    s = int(np.rint(seconds))
+    if s < 60:         return '%ds'                % (s)
+    elif s < 60*60:    return '%dm %02ds'          % (s // 60, s % 60)
+    elif s < 24*60*60: return '%dh %02dm %02ds'    % (s // (60*60), (s // 60) % 60, s % 60)
+    else:              return '%dd %02dh %02dm'    % (s // (24*60*60), (s // (60*60)) % 24, (s // 60) % 60)
+
+#----------------------------------------------------------------------------
+# Locating results.
+
+def locate_result_subdir(run_id_or_result_subdir):
+    if isinstance(run_id_or_result_subdir, str) and os.path.isdir(run_id_or_result_subdir):
+        return run_id_or_result_subdir
+
+    searchdirs = []
+    searchdirs += ['']
+    searchdirs += ['results']
+    searchdirs += ['networks']
+
+    for searchdir in searchdirs:
+        dir = config.result_dir if searchdir == '' else os.path.join(config.result_dir, searchdir)
+        dir = os.path.join(dir, str(run_id_or_result_subdir))
+        if os.path.isdir(dir):
+            return dir
+        prefix = '%03d' % run_id_or_result_subdir if isinstance(run_id_or_result_subdir, int) else str(run_id_or_result_subdir)
+        dirs = sorted(glob.glob(os.path.join(config.result_dir, searchdir, prefix + '-*')))
+        dirs = [dir for dir in dirs if os.path.isdir(dir)]
+        if len(dirs) == 1:
+            return dirs[0]
+    raise IOError('Cannot locate result subdir for run', run_id_or_result_subdir)
+
+def list_network_pkls(run_id_or_result_subdir, include_final=True):
+    result_subdir = locate_result_subdir(run_id_or_result_subdir)
+    pkls = sorted(glob.glob(os.path.join(result_subdir, 'network-*.pkl')))
+    if len(pkls) >= 1 and os.path.basename(pkls[0]) == 'network-final.pkl':
+        if include_final:
+            pkls.append(pkls[0])
+        del pkls[0]
+    return pkls
+
+def locate_network_pkl(run_id_or_result_subdir_or_network_pkl, snapshot=None):
+    if isinstance(run_id_or_result_subdir_or_network_pkl, str) and os.path.isfile(run_id_or_result_subdir_or_network_pkl):
+        return run_id_or_result_subdir_or_network_pkl
+
+    pkls = list_network_pkls(run_id_or_result_subdir_or_network_pkl)
+    if len(pkls) >= 1 and snapshot is None:
+        return pkls[-1]
+    for pkl in pkls:
+        try:
+            name = os.path.splitext(os.path.basename(pkl))[0]
+            number = int(name.split('-')[-1])
+            if number == snapshot:
+                return pkl
+        except ValueError: pass
+        except IndexError: pass
+    raise IOError('Cannot locate network pkl for snapshot', snapshot)
+
+def get_id_string_for_network_pkl(network_pkl):
+    p = network_pkl.replace('.pkl', '').replace('\\', '/').split('/')
+    return '-'.join(p[max(len(p) - 2, 0):])
+
+#----------------------------------------------------------------------------
+# Loading and using trained networks.
+
+def load_network_pkl(run_id_or_result_subdir_or_network_pkl, snapshot=None):
+    return load_pkl(locate_network_pkl(run_id_or_result_subdir_or_network_pkl, snapshot))
+
+def random_latents(num_latents, G, random_state=None):
+    if random_state is not None:
+        return random_state.randn(num_latents, *G.input_shape[1:]).astype(np.float32)
+    else:
+        return np.random.randn(num_latents, *G.input_shape[1:]).astype(np.float32)
+
+def load_dataset_for_previous_run(run_id, **kwargs): # => dataset_obj, mirror_augment
+    result_subdir = locate_result_subdir(run_id)
+
+    # Parse config.txt.
+    parsed_cfg = dict()
+    with open(os.path.join(result_subdir, 'config.txt'), 'rt') as f:
+        for line in f:
+            if line.startswith('dataset =') or line.startswith('train ='):
+                exec(line, parsed_cfg, parsed_cfg)
+    dataset_cfg = parsed_cfg.get('dataset', dict())
+    train_cfg = parsed_cfg.get('train', dict())
+    mirror_augment = train_cfg.get('mirror_augment', False)
+
+    # Handle legacy options.
+    if 'h5_path' in dataset_cfg:
+        dataset_cfg['tfrecord_dir'] = dataset_cfg.pop('h5_path').replace('.h5', '')
+    if 'mirror_augment' in dataset_cfg:
+        mirror_augment = dataset_cfg.pop('mirror_augment')
+    if 'max_labels' in dataset_cfg:
+        v = dataset_cfg.pop('max_labels')
+        if v is None: v = 0
+        if v == 'all': v = 'full'
+        dataset_cfg['max_label_size'] = v
+    if 'max_images' in dataset_cfg:
+        dataset_cfg.pop('max_images')
+
+    # Handle legacy dataset names.
+    v = dataset_cfg['tfrecord_dir']
+    v = v.replace('-32x32', '').replace('-32', '')
+    v = v.replace('-128x128', '').replace('-128', '')
+    v = v.replace('-256x256', '').replace('-256', '')
+    v = v.replace('-1024x1024', '').replace('-1024', '')
+    v = v.replace('celeba-hq', 'celebahq')
+    v = v.replace('cifar-10', 'cifar10')
+    v = v.replace('cifar-100', 'cifar100')
+    v = v.replace('mnist-rgb', 'mnistrgb')
+    v = re.sub('lsun-100k-([^-]*)', 'lsun-\\1-100k', v)
+    v = re.sub('lsun-full-([^-]*)', 'lsun-\\1-full', v)
+    dataset_cfg['tfrecord_dir'] = v
+
+    # Load dataset.
+    dataset_cfg.update(kwargs)
+    dataset_obj = dataset.load_dataset(data_dir=config.data_dir, **dataset_cfg)
+    return dataset_obj, mirror_augment
+
+def apply_mirror_augment(minibatch):
+    mask = np.random.rand(minibatch.shape[0]) < 0.5
+    minibatch = np.array(minibatch)
+    minibatch[mask] = minibatch[mask, :, :, ::-1]
+    return minibatch
+
+#----------------------------------------------------------------------------
+# Text labels.
+
+_text_label_cache = OrderedDict()
+
+def draw_text_label(img, text, x, y, alignx=0.5, aligny=0.5, color=255, opacity=1.0, glow_opacity=1.0, **kwargs):
+    color = np.array(color).flatten().astype(np.float32)
+    assert img.ndim == 3 and img.shape[2] == color.size or color.size == 1
+    alpha, glow = setup_text_label(text, **kwargs)
+    xx, yy = int(np.rint(x - alpha.shape[1] * alignx)), int(np.rint(y - alpha.shape[0] * aligny))
+    xb, yb = max(-xx, 0), max(-yy, 0)
+    xe, ye = min(alpha.shape[1], img.shape[1] - xx), min(alpha.shape[0], img.shape[0] - yy)
+    img = np.array(img)
+    slice = img[yy+yb : yy+ye, xx+xb : xx+xe, :]
+    slice[:] = slice * (1.0 - (1.0 - (1.0 - alpha[yb:ye, xb:xe]) * (1.0 - glow[yb:ye, xb:xe] * glow_opacity)) * opacity)[:, :, np.newaxis]
+    slice[:] = slice + alpha[yb:ye, xb:xe, np.newaxis] * (color * opacity)[np.newaxis, np.newaxis, :]
+    return img
+
+def setup_text_label(text, font='Calibri', fontsize=32, padding=6, glow_size=2.0, glow_coef=3.0, glow_exp=2.0, cache_size=100): # => (alpha, glow)
+    # Lookup from cache.
+    key = (text, font, fontsize, padding, glow_size, glow_coef, glow_exp)
+    if key in _text_label_cache:
+        value = _text_label_cache[key]
+        del _text_label_cache[key] # LRU policy
+        _text_label_cache[key] = value
+        return value
+
+    # Limit cache size.
+    while len(_text_label_cache) >= cache_size:
+        _text_label_cache.popitem(last=False)
+
+    # Render text.
+    import moviepy.editor # pip install moviepy
+    alpha = moviepy.editor.TextClip(text, font=font, fontsize=fontsize).mask.make_frame(0)
+    alpha = np.pad(alpha, padding, mode='constant', constant_values=0.0)
+    glow = scipy.ndimage.gaussian_filter(alpha, glow_size)
+    glow = 1.0 - np.maximum(1.0 - glow * glow_coef, 0.0) ** glow_exp
+
+    # Add to cache.
+    value = (alpha, glow)
+    _text_label_cache[key] = value
+    return value
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/networks.py

@@ -0,0 +1,315 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import numpy as np
+import tensorflow as tf
+
+# NOTE: Do not import any application-specific modules here!
+
+#----------------------------------------------------------------------------
+
+def lerp(a, b, t): return a + (b - a) * t
+def lerp_clip(a, b, t): return a + (b - a) * tf.clip_by_value(t, 0.0, 1.0)
+def cset(cur_lambda, new_cond, new_lambda): return lambda: tf.cond(new_cond, new_lambda, cur_lambda)
+
+#----------------------------------------------------------------------------
+# Get/create weight tensor for a convolutional or fully-connected layer.
+
+def get_weight(shape, gain=np.sqrt(2), use_wscale=False, fan_in=None):
+    if fan_in is None: fan_in = np.prod(shape[:-1])
+    std = gain / np.sqrt(fan_in) # He init
+    if use_wscale:
+        wscale = tf.constant(np.float32(std), name='wscale')
+        return tf.get_variable('weight', shape=shape, initializer=tf.initializers.random_normal()) * wscale
+    else:
+        return tf.get_variable('weight', shape=shape, initializer=tf.initializers.random_normal(0, std))
+
+#----------------------------------------------------------------------------
+# Fully-connected layer.
+
+def dense(x, fmaps, gain=np.sqrt(2), use_wscale=False):
+    if len(x.shape) > 2:
+        x = tf.reshape(x, [-1, np.prod([d.value for d in x.shape[1:]])])
+    w = get_weight([x.shape[1].value, fmaps], gain=gain, use_wscale=use_wscale)
+    w = tf.cast(w, x.dtype)
+    return tf.matmul(x, w)
+
+#----------------------------------------------------------------------------
+# Convolutional layer.
+
+def conv2d(x, fmaps, kernel, gain=np.sqrt(2), use_wscale=False):
+    assert kernel >= 1 and kernel % 2 == 1
+    w = get_weight([kernel, kernel, x.shape[1].value, fmaps], gain=gain, use_wscale=use_wscale)
+    w = tf.cast(w, x.dtype)
+    return tf.nn.conv2d(x, w, strides=[1,1,1,1], padding='SAME', data_format='NCHW')
+
+#----------------------------------------------------------------------------
+# Apply bias to the given activation tensor.
+
+def apply_bias(x):
+    b = tf.get_variable('bias', shape=[x.shape[1]], initializer=tf.initializers.zeros())
+    b = tf.cast(b, x.dtype)
+    if len(x.shape) == 2:
+        return x + b
+    else:
+        return x + tf.reshape(b, [1, -1, 1, 1])
+
+#----------------------------------------------------------------------------
+# Leaky ReLU activation. Same as tf.nn.leaky_relu, but supports FP16.
+
+def leaky_relu(x, alpha=0.2):
+    with tf.name_scope('LeakyRelu'):
+        alpha = tf.constant(alpha, dtype=x.dtype, name='alpha')
+        return tf.maximum(x * alpha, x)
+
+#----------------------------------------------------------------------------
+# Nearest-neighbor upscaling layer.
+
+def upscale2d(x, factor=2):
+    assert isinstance(factor, int) and factor >= 1
+    if factor == 1: return x
+    with tf.variable_scope('Upscale2D'):
+        s = x.shape
+        x = tf.reshape(x, [-1, s[1], s[2], 1, s[3], 1])
+        x = tf.tile(x, [1, 1, 1, factor, 1, factor])
+        x = tf.reshape(x, [-1, s[1], s[2] * factor, s[3] * factor])
+        return x
+
+#----------------------------------------------------------------------------
+# Fused upscale2d + conv2d.
+# Faster and uses less memory than performing the operations separately.
+
+def upscale2d_conv2d(x, fmaps, kernel, gain=np.sqrt(2), use_wscale=False):
+    assert kernel >= 1 and kernel % 2 == 1
+    w = get_weight([kernel, kernel, fmaps, x.shape[1].value], gain=gain, use_wscale=use_wscale, fan_in=(kernel**2)*x.shape[1].value)
+    w = tf.pad(w, [[1,1], [1,1], [0,0], [0,0]], mode='CONSTANT')
+    w = tf.add_n([w[1:, 1:], w[:-1, 1:], w[1:, :-1], w[:-1, :-1]])
+    w = tf.cast(w, x.dtype)
+    os = [tf.shape(x)[0], fmaps, x.shape[2] * 2, x.shape[3] * 2]
+    return tf.nn.conv2d_transpose(x, w, os, strides=[1,1,2,2], padding='SAME', data_format='NCHW')
+
+#----------------------------------------------------------------------------
+# Box filter downscaling layer.
+
+def downscale2d(x, factor=2):
+    assert isinstance(factor, int) and factor >= 1
+    if factor == 1: return x
+    with tf.variable_scope('Downscale2D'):
+        ksize = [1, 1, factor, factor]
+        return tf.nn.avg_pool(x, ksize=ksize, strides=ksize, padding='VALID', data_format='NCHW') # NOTE: requires tf_config['graph_options.place_pruned_graph'] = True
+
+#----------------------------------------------------------------------------
+# Fused conv2d + downscale2d.
+# Faster and uses less memory than performing the operations separately.
+
+def conv2d_downscale2d(x, fmaps, kernel, gain=np.sqrt(2), use_wscale=False):
+    assert kernel >= 1 and kernel % 2 == 1
+    w = get_weight([kernel, kernel, x.shape[1].value, fmaps], gain=gain, use_wscale=use_wscale)
+    w = tf.pad(w, [[1,1], [1,1], [0,0], [0,0]], mode='CONSTANT')
+    w = tf.add_n([w[1:, 1:], w[:-1, 1:], w[1:, :-1], w[:-1, :-1]]) * 0.25
+    w = tf.cast(w, x.dtype)
+    return tf.nn.conv2d(x, w, strides=[1,1,2,2], padding='SAME', data_format='NCHW')
+
+#----------------------------------------------------------------------------
+# Pixelwise feature vector normalization.
+
+def pixel_norm(x, epsilon=1e-8):
+    with tf.variable_scope('PixelNorm'):
+        return x * tf.rsqrt(tf.reduce_mean(tf.square(x), axis=1, keepdims=True) + epsilon)
+
+#----------------------------------------------------------------------------
+# Minibatch standard deviation.
+
+def minibatch_stddev_layer(x, group_size=4):
+    with tf.variable_scope('MinibatchStddev'):
+        group_size = tf.minimum(group_size, tf.shape(x)[0])     # Minibatch must be divisible by (or smaller than) group_size.
+        s = x.shape                                             # [NCHW]  Input shape.
+        y = tf.reshape(x, [group_size, -1, s[1], s[2], s[3]])   # [GMCHW] Split minibatch into M groups of size G.
+        y = tf.cast(y, tf.float32)                              # [GMCHW] Cast to FP32.
+        y -= tf.reduce_mean(y, axis=0, keepdims=True)           # [GMCHW] Subtract mean over group.
+        y = tf.reduce_mean(tf.square(y), axis=0)                # [MCHW]  Calc variance over group.
+        y = tf.sqrt(y + 1e-8)                                   # [MCHW]  Calc stddev over group.
+        y = tf.reduce_mean(y, axis=[1,2,3], keepdims=True)      # [M111]  Take average over fmaps and pixels.
+        y = tf.cast(y, x.dtype)                                 # [M111]  Cast back to original data type.
+        y = tf.tile(y, [group_size, 1, s[2], s[3]])             # [N1HW]  Replicate over group and pixels.
+        return tf.concat([x, y], axis=1)                        # [NCHW]  Append as new fmap.
+
+#----------------------------------------------------------------------------
+# Generator network used in the paper.
+
+def G_paper(
+    latents_in,                         # First input: Latent vectors [minibatch, latent_size].
+    labels_in,                          # Second input: Labels [minibatch, label_size].
+    num_channels        = 1,            # Number of output color channels. Overridden based on dataset.
+    resolution          = 32,           # Output resolution. Overridden based on dataset.
+    label_size          = 0,            # Dimensionality of the labels, 0 if no labels. Overridden based on dataset.
+    fmap_base           = 8192,         # Overall multiplier for the number of feature maps.
+    fmap_decay          = 1.0,          # log2 feature map reduction when doubling the resolution.
+    fmap_max            = 512,          # Maximum number of feature maps in any layer.
+    latent_size         = None,         # Dimensionality of the latent vectors. None = min(fmap_base, fmap_max).
+    normalize_latents   = True,         # Normalize latent vectors before feeding them to the network?
+    use_wscale          = True,         # Enable equalized learning rate?
+    use_pixelnorm       = True,         # Enable pixelwise feature vector normalization?
+    pixelnorm_epsilon   = 1e-8,         # Constant epsilon for pixelwise feature vector normalization.
+    use_leakyrelu       = True,         # True = leaky ReLU, False = ReLU.
+    dtype               = 'float32',    # Data type to use for activations and outputs.
+    fused_scale         = True,         # True = use fused upscale2d + conv2d, False = separate upscale2d layers.
+    structure           = None,         # 'linear' = human-readable, 'recursive' = efficient, None = select automatically.
+    is_template_graph   = False,        # True = template graph constructed by the Network class, False = actual evaluation.
+    **kwargs):                          # Ignore unrecognized keyword args.
+    
+    resolution_log2 = int(np.log2(resolution))
+    assert resolution == 2**resolution_log2 and resolution >= 4
+    def nf(stage): return min(int(fmap_base / (2.0 ** (stage * fmap_decay))), fmap_max)
+    def PN(x): return pixel_norm(x, epsilon=pixelnorm_epsilon) if use_pixelnorm else x
+    if latent_size is None: latent_size = nf(0)
+    if structure is None: structure = 'linear' if is_template_graph else 'recursive'
+    act = leaky_relu if use_leakyrelu else tf.nn.relu
+    
+    latents_in.set_shape([None, latent_size])
+    labels_in.set_shape([None, label_size])
+    combo_in = tf.cast(tf.concat([latents_in, labels_in], axis=1), dtype)
+    lod_in = tf.cast(tf.get_variable('lod', initializer=np.float32(0.0), trainable=False), dtype)
+
+    # Building blocks.
+    def block(x, res): # res = 2..resolution_log2
+        with tf.variable_scope('%dx%d' % (2**res, 2**res)):
+            if res == 2: # 4x4
+                if normalize_latents: x = pixel_norm(x, epsilon=pixelnorm_epsilon)
+                with tf.variable_scope('Dense'):
+                    x = dense(x, fmaps=nf(res-1)*16, gain=np.sqrt(2)/4, use_wscale=use_wscale) # override gain to match the original Theano implementation
+                    x = tf.reshape(x, [-1, nf(res-1), 4, 4])
+                    x = PN(act(apply_bias(x)))
+                with tf.variable_scope('Conv'):
+                    x = PN(act(apply_bias(conv2d(x, fmaps=nf(res-1), kernel=3, use_wscale=use_wscale))))
+            else: # 8x8 and up
+                if fused_scale:
+                    with tf.variable_scope('Conv0_up'):
+                        x = PN(act(apply_bias(upscale2d_conv2d(x, fmaps=nf(res-1), kernel=3, use_wscale=use_wscale))))
+                else:
+                    x = upscale2d(x)
+                    with tf.variable_scope('Conv0'):
+                        x = PN(act(apply_bias(conv2d(x, fmaps=nf(res-1), kernel=3, use_wscale=use_wscale))))
+                with tf.variable_scope('Conv1'):
+                    x = PN(act(apply_bias(conv2d(x, fmaps=nf(res-1), kernel=3, use_wscale=use_wscale))))
+            return x
+    def torgb(x, res): # res = 2..resolution_log2
+        lod = resolution_log2 - res
+        with tf.variable_scope('ToRGB_lod%d' % lod):
+            return apply_bias(conv2d(x, fmaps=num_channels, kernel=1, gain=1, use_wscale=use_wscale))
+
+    # Linear structure: simple but inefficient.
+    if structure == 'linear':
+        x = block(combo_in, 2)
+        images_out = torgb(x, 2)
+        for res in range(3, resolution_log2 + 1):
+            lod = resolution_log2 - res
+            x = block(x, res)
+            img = torgb(x, res)
+            images_out = upscale2d(images_out)
+            with tf.variable_scope('Grow_lod%d' % lod):
+                images_out = lerp_clip(img, images_out, lod_in - lod)
+
+    # Recursive structure: complex but efficient.
+    if structure == 'recursive':
+        def grow(x, res, lod):
+            y = block(x, res)
+            img = lambda: upscale2d(torgb(y, res), 2**lod)
+            if res > 2: img = cset(img, (lod_in > lod), lambda: upscale2d(lerp(torgb(y, res), upscale2d(torgb(x, res - 1)), lod_in - lod), 2**lod))
+            if lod > 0: img = cset(img, (lod_in < lod), lambda: grow(y, res + 1, lod - 1))
+            return img()
+        images_out = grow(combo_in, 2, resolution_log2 - 2)
+        
+    assert images_out.dtype == tf.as_dtype(dtype)
+    images_out = tf.identity(images_out, name='images_out')
+    return images_out
+
+#----------------------------------------------------------------------------
+# Discriminator network used in the paper.
+
+def D_paper(
+    images_in,                          # Input: Images [minibatch, channel, height, width].
+    num_channels        = 1,            # Number of input color channels. Overridden based on dataset.
+    resolution          = 32,           # Input resolution. Overridden based on dataset.
+    label_size          = 0,            # Dimensionality of the labels, 0 if no labels. Overridden based on dataset.
+    fmap_base           = 8192,         # Overall multiplier for the number of feature maps.
+    fmap_decay          = 1.0,          # log2 feature map reduction when doubling the resolution.
+    fmap_max            = 512,          # Maximum number of feature maps in any layer.
+    use_wscale          = True,         # Enable equalized learning rate?
+    mbstd_group_size    = 4,            # Group size for the minibatch standard deviation layer, 0 = disable.
+    dtype               = 'float32',    # Data type to use for activations and outputs.
+    fused_scale         = True,         # True = use fused conv2d + downscale2d, False = separate downscale2d layers.
+    structure           = None,         # 'linear' = human-readable, 'recursive' = efficient, None = select automatically
+    is_template_graph   = False,        # True = template graph constructed by the Network class, False = actual evaluation.
+    **kwargs):                          # Ignore unrecognized keyword args.
+    
+    resolution_log2 = int(np.log2(resolution))
+    assert resolution == 2**resolution_log2 and resolution >= 4
+    def nf(stage): return min(int(fmap_base / (2.0 ** (stage * fmap_decay))), fmap_max)
+    if structure is None: structure = 'linear' if is_template_graph else 'recursive'
+    act = leaky_relu
+
+    images_in.set_shape([None, num_channels, resolution, resolution])
+    images_in = tf.cast(images_in, dtype)
+    lod_in = tf.cast(tf.get_variable('lod', initializer=np.float32(0.0), trainable=False), dtype)
+
+    # Building blocks.
+    def fromrgb(x, res): # res = 2..resolution_log2
+        with tf.variable_scope('FromRGB_lod%d' % (resolution_log2 - res)):
+            return act(apply_bias(conv2d(x, fmaps=nf(res-1), kernel=1, use_wscale=use_wscale)))
+    def block(x, res): # res = 2..resolution_log2
+        with tf.variable_scope('%dx%d' % (2**res, 2**res)):
+            if res >= 3: # 8x8 and up
+                with tf.variable_scope('Conv0'):
+                    x = act(apply_bias(conv2d(x, fmaps=nf(res-1), kernel=3, use_wscale=use_wscale)))
+                if fused_scale:
+                    with tf.variable_scope('Conv1_down'):
+                        x = act(apply_bias(conv2d_downscale2d(x, fmaps=nf(res-2), kernel=3, use_wscale=use_wscale)))
+                else:
+                    with tf.variable_scope('Conv1'):
+                        x = act(apply_bias(conv2d(x, fmaps=nf(res-2), kernel=3, use_wscale=use_wscale)))
+                    x = downscale2d(x)
+            else: # 4x4
+                if mbstd_group_size > 1:
+                    x = minibatch_stddev_layer(x, mbstd_group_size)
+                with tf.variable_scope('Conv'):
+                    x = act(apply_bias(conv2d(x, fmaps=nf(res-1), kernel=3, use_wscale=use_wscale)))
+                with tf.variable_scope('Dense0'):
+                    x = act(apply_bias(dense(x, fmaps=nf(res-2), use_wscale=use_wscale)))
+                with tf.variable_scope('Dense1'):
+                    x = apply_bias(dense(x, fmaps=1+label_size, gain=1, use_wscale=use_wscale))
+            return x
+    
+    # Linear structure: simple but inefficient.
+    if structure == 'linear':
+        img = images_in
+        x = fromrgb(img, resolution_log2)
+        for res in range(resolution_log2, 2, -1):
+            lod = resolution_log2 - res
+            x = block(x, res)
+            img = downscale2d(img)
+            y = fromrgb(img, res - 1)
+            with tf.variable_scope('Grow_lod%d' % lod):
+                x = lerp_clip(x, y, lod_in - lod)
+        combo_out = block(x, 2)
+
+    # Recursive structure: complex but efficient.
+    if structure == 'recursive':
+        def grow(res, lod):
+            x = lambda: fromrgb(downscale2d(images_in, 2**lod), res)
+            if lod > 0: x = cset(x, (lod_in < lod), lambda: grow(res + 1, lod - 1))
+            x = block(x(), res); y = lambda: x
+            if res > 2: y = cset(y, (lod_in > lod), lambda: lerp(x, fromrgb(downscale2d(images_in, 2**(lod+1)), res - 1), lod_in - lod))
+            return y()
+        combo_out = grow(2, resolution_log2 - 2)
+
+    assert combo_out.dtype == tf.as_dtype(dtype)
+    scores_out = tf.identity(combo_out[:, :1], name='scores_out')
+    labels_out = tf.identity(combo_out[:, 1:], name='labels_out')
+    return scores_out, labels_out
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/requirements-pip.txt

@@ -0,0 +1,10 @@
+numpy>=1.13.3
+scipy>=1.0.0
+tensorflow-gpu>=1.6.0
+moviepy>=0.2.3.2
+Pillow>=3.1.1
+lmdb>=0.93
+opencv-python>=3.4.0.12
+cryptography>=2.1.4
+h5py>=2.7.1
+six>=1.11.0

models/pggan_tf_official/tfutil.py

@@ -0,0 +1,749 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import os
+import sys
+import inspect
+import importlib
+import imp
+import numpy as np
+from collections import OrderedDict
+import tensorflow as tf
+
+#----------------------------------------------------------------------------
+# Convenience.
+
+def run(*args, **kwargs): # Run the specified ops in the default session.
+    return tf.get_default_session().run(*args, **kwargs)
+
+def is_tf_expression(x):
+    return isinstance(x, tf.Tensor) or isinstance(x, tf.Variable) or isinstance(x, tf.Operation)
+
+def shape_to_list(shape):
+    return [dim.value for dim in shape]
+
+def flatten(x):
+    with tf.name_scope('Flatten'):
+        return tf.reshape(x, [-1])
+
+def log2(x):
+    with tf.name_scope('Log2'):
+        return tf.log(x) * np.float32(1.0 / np.log(2.0))
+
+def exp2(x):
+    with tf.name_scope('Exp2'):
+        return tf.exp(x * np.float32(np.log(2.0)))
+
+def lerp(a, b, t):
+    with tf.name_scope('Lerp'):
+        return a + (b - a) * t
+
+def lerp_clip(a, b, t):
+    with tf.name_scope('LerpClip'):
+        return a + (b - a) * tf.clip_by_value(t, 0.0, 1.0)
+
+def absolute_name_scope(scope): # Forcefully enter the specified name scope, ignoring any surrounding scopes.
+    return tf.name_scope(scope + '/')
+
+#----------------------------------------------------------------------------
+# Initialize TensorFlow graph and session using good default settings.
+
+def init_tf(config_dict=dict()):
+    if tf.get_default_session() is None:
+        tf.set_random_seed(np.random.randint(1 << 31))
+        create_session(config_dict, force_as_default=True)
+
+#----------------------------------------------------------------------------
+# Create tf.Session based on config dict of the form
+# {'gpu_options.allow_growth': True}
+
+def create_session(config_dict=dict(), force_as_default=False):
+    config = tf.ConfigProto()
+    for key, value in config_dict.items():
+        fields = key.split('.')
+        obj = config
+        for field in fields[:-1]:
+            obj = getattr(obj, field)
+        setattr(obj, fields[-1], value)
+    session = tf.Session(config=config)
+    if force_as_default:
+        session._default_session = session.as_default()
+        session._default_session.enforce_nesting = False
+        session._default_session.__enter__()
+    return session
+
+#----------------------------------------------------------------------------
+# Initialize all tf.Variables that have not already been initialized.
+# Equivalent to the following, but more efficient and does not bloat the tf graph:
+#   tf.variables_initializer(tf.report_unitialized_variables()).run()
+
+def init_uninited_vars(vars=None):
+    if vars is None: vars = tf.global_variables()
+    test_vars = []; test_ops = []
+    with tf.control_dependencies(None): # ignore surrounding control_dependencies
+        for var in vars:
+            assert is_tf_expression(var)
+            try:
+                tf.get_default_graph().get_tensor_by_name(var.name.replace(':0', '/IsVariableInitialized:0'))
+            except KeyError:
+                # Op does not exist => variable may be uninitialized.
+                test_vars.append(var)
+                with absolute_name_scope(var.name.split(':')[0]):
+                    test_ops.append(tf.is_variable_initialized(var))
+    init_vars = [var for var, inited in zip(test_vars, run(test_ops)) if not inited]
+    run([var.initializer for var in init_vars])
+
+#----------------------------------------------------------------------------
+# Set the values of given tf.Variables.
+# Equivalent to the following, but more efficient and does not bloat the tf graph:
+#   tfutil.run([tf.assign(var, value) for var, value in var_to_value_dict.items()]
+
+def set_vars(var_to_value_dict):
+    ops = []
+    feed_dict = {}
+    for var, value in var_to_value_dict.items():
+        assert is_tf_expression(var)
+        try:
+            setter = tf.get_default_graph().get_tensor_by_name(var.name.replace(':0', '/setter:0')) # look for existing op
+        except KeyError:
+            with absolute_name_scope(var.name.split(':')[0]):
+                with tf.control_dependencies(None): # ignore surrounding control_dependencies
+                    setter = tf.assign(var, tf.placeholder(var.dtype, var.shape, 'new_value'), name='setter') # create new setter
+        ops.append(setter)
+        feed_dict[setter.op.inputs[1]] = value
+    run(ops, feed_dict)
+
+#----------------------------------------------------------------------------
+# Autosummary creates an identity op that internally keeps track of the input
+# values and automatically shows up in TensorBoard. The reported value
+# represents an average over input components. The average is accumulated
+# constantly over time and flushed when save_summaries() is called.
+#
+# Notes:
+# - The output tensor must be used as an input for something else in the
+#   graph. Otherwise, the autosummary op will not get executed, and the average
+#   value will not get accumulated.
+# - It is perfectly fine to include autosummaries with the same name in
+#   several places throughout the graph, even if they are executed concurrently.
+# - It is ok to also pass in a python scalar or numpy array. In this case, it
+#   is added to the average immediately.
+
+_autosummary_vars = OrderedDict() # name => [var, ...]
+_autosummary_immediate = OrderedDict() # name => update_op, update_value
+_autosummary_finalized = False
+
+def autosummary(name, value):
+    id = name.replace('/', '_')
+    if is_tf_expression(value):
+        with tf.name_scope('summary_' + id), tf.device(value.device):
+            update_op = _create_autosummary_var(name, value)
+            with tf.control_dependencies([update_op]):
+                return tf.identity(value)
+    else: # python scalar or numpy array
+        if name not in _autosummary_immediate:
+            with absolute_name_scope('Autosummary/' + id), tf.device(None), tf.control_dependencies(None):
+                update_value = tf.placeholder(tf.float32)
+                update_op = _create_autosummary_var(name, update_value)
+                _autosummary_immediate[name] = update_op, update_value
+        update_op, update_value = _autosummary_immediate[name]
+        run(update_op, {update_value: np.float32(value)})
+        return value
+
+# Create the necessary ops to include autosummaries in TensorBoard report.
+# Note: This should be done only once per graph.
+def finalize_autosummaries():
+    global _autosummary_finalized
+    if _autosummary_finalized:
+        return
+    _autosummary_finalized = True
+    init_uninited_vars([var for vars in _autosummary_vars.values() for var in vars])
+    with tf.device(None), tf.control_dependencies(None):
+        for name, vars in _autosummary_vars.items():
+            id = name.replace('/', '_')
+            with absolute_name_scope('Autosummary/' + id):
+                sum = tf.add_n(vars)
+                avg = sum[0] / sum[1]
+                with tf.control_dependencies([avg]): # read before resetting
+                    reset_ops = [tf.assign(var, tf.zeros(2)) for var in vars]
+                    with tf.name_scope(None), tf.control_dependencies(reset_ops): # reset before reporting
+                        tf.summary.scalar(name, avg)
+
+# Internal helper for creating autosummary accumulators.
+def _create_autosummary_var(name, value_expr):
+    assert not _autosummary_finalized
+    v = tf.cast(value_expr, tf.float32)
+    if v.shape.ndims is 0:
+        v = [v, np.float32(1.0)]
+    elif v.shape.ndims is 1:
+        v = [tf.reduce_sum(v), tf.cast(tf.shape(v)[0], tf.float32)]
+    else:
+        v = [tf.reduce_sum(v), tf.reduce_prod(tf.cast(tf.shape(v), tf.float32))]
+    v = tf.cond(tf.is_finite(v[0]), lambda: tf.stack(v), lambda: tf.zeros(2))
+    with tf.control_dependencies(None):
+        var = tf.Variable(tf.zeros(2)) # [numerator, denominator]
+    update_op = tf.cond(tf.is_variable_initialized(var), lambda: tf.assign_add(var, v), lambda: tf.assign(var, v))
+    if name in _autosummary_vars:
+        _autosummary_vars[name].append(var)
+    else:
+        _autosummary_vars[name] = [var]
+    return update_op
+
+#----------------------------------------------------------------------------
+# Call filewriter.add_summary() with all summaries in the default graph,
+# automatically finalizing and merging them on the first call.
+
+_summary_merge_op = None
+
+def save_summaries(filewriter, global_step=None):
+    global _summary_merge_op
+    if _summary_merge_op is None:
+        finalize_autosummaries()
+        with tf.device(None), tf.control_dependencies(None):
+            _summary_merge_op = tf.summary.merge_all()
+    filewriter.add_summary(_summary_merge_op.eval(), global_step)
+
+#----------------------------------------------------------------------------
+# Utilities for importing modules and objects by name.
+
+def import_module(module_or_obj_name):
+    parts = module_or_obj_name.split('.')
+    parts[0] = {'np': 'numpy', 'tf': 'tensorflow'}.get(parts[0], parts[0])
+    for i in range(len(parts), 0, -1):
+        try:
+            module = importlib.import_module('.'.join(parts[:i]))
+            relative_obj_name = '.'.join(parts[i:])
+            return module, relative_obj_name
+        except ImportError:
+            pass
+    raise ImportError(module_or_obj_name)
+
+def find_obj_in_module(module, relative_obj_name):
+    obj = module
+    for part in relative_obj_name.split('.'):
+        obj = getattr(obj, part)
+    return obj
+
+def import_obj(obj_name):
+    module, relative_obj_name = import_module(obj_name)
+    return find_obj_in_module(module, relative_obj_name)
+
+def call_func_by_name(*args, func=None, **kwargs):
+    assert func is not None
+    return import_obj(func)(*args, **kwargs)
+
+#----------------------------------------------------------------------------
+# Wrapper for tf.train.Optimizer that automatically takes care of:
+# - Gradient averaging for multi-GPU training.
+# - Dynamic loss scaling and typecasts for FP16 training.
+# - Ignoring corrupted gradients that contain NaNs/Infs.
+# - Reporting statistics.
+# - Well-chosen default settings.
+
+class Optimizer:
+    def __init__(
+        self,
+        name                = 'Train',
+        tf_optimizer        = 'tf.train.AdamOptimizer',
+        learning_rate       = 0.001,
+        use_loss_scaling    = False,
+        loss_scaling_init   = 64.0,
+        loss_scaling_inc    = 0.0005,
+        loss_scaling_dec    = 1.0,
+        **kwargs):
+
+        # Init fields.
+        self.name               = name
+        self.learning_rate      = tf.convert_to_tensor(learning_rate)
+        self.id                 = self.name.replace('/', '.')
+        self.scope              = tf.get_default_graph().unique_name(self.id)
+        self.optimizer_class    = import_obj(tf_optimizer)
+        self.optimizer_kwargs   = dict(kwargs)
+        self.use_loss_scaling   = use_loss_scaling
+        self.loss_scaling_init  = loss_scaling_init
+        self.loss_scaling_inc   = loss_scaling_inc
+        self.loss_scaling_dec   = loss_scaling_dec
+        self._grad_shapes       = None          # [shape, ...]
+        self._dev_opt           = OrderedDict() # device => optimizer
+        self._dev_grads         = OrderedDict() # device => [[(grad, var), ...], ...]
+        self._dev_ls_var        = OrderedDict() # device => variable (log2 of loss scaling factor)
+        self._updates_applied   = False
+
+    # Register the gradients of the given loss function with respect to the given variables.
+    # Intended to be called once per GPU.
+    def register_gradients(self, loss, vars):
+        assert not self._updates_applied
+
+        # Validate arguments.
+        if isinstance(vars, dict):
+            vars = list(vars.values()) # allow passing in Network.trainables as vars
+        assert isinstance(vars, list) and len(vars) >= 1
+        assert all(is_tf_expression(expr) for expr in vars + [loss])
+        if self._grad_shapes is None:
+            self._grad_shapes = [shape_to_list(var.shape) for var in vars]
+        assert len(vars) == len(self._grad_shapes)
+        assert all(shape_to_list(var.shape) == var_shape for var, var_shape in zip(vars, self._grad_shapes))
+        dev = loss.device
+        assert all(var.device == dev for var in vars)
+
+        # Register device and compute gradients.
+        with tf.name_scope(self.id + '_grad'), tf.device(dev):
+            if dev not in self._dev_opt:
+                opt_name = self.scope.replace('/', '_') + '_opt%d' % len(self._dev_opt)
+                self._dev_opt[dev] = self.optimizer_class(name=opt_name, learning_rate=self.learning_rate, **self.optimizer_kwargs)
+                self._dev_grads[dev] = []
+            loss = self.apply_loss_scaling(tf.cast(loss, tf.float32))
+            grads = self._dev_opt[dev].compute_gradients(loss, vars, gate_gradients=tf.train.Optimizer.GATE_NONE) # disable gating to reduce memory usage
+            grads = [(g, v) if g is not None else (tf.zeros_like(v), v) for g, v in grads] # replace disconnected gradients with zeros
+            self._dev_grads[dev].append(grads)
+
+    # Construct training op to update the registered variables based on their gradients.
+    def apply_updates(self):
+        assert not self._updates_applied
+        self._updates_applied = True
+        devices = list(self._dev_grads.keys())
+        total_grads = sum(len(grads) for grads in self._dev_grads.values())
+        assert len(devices) >= 1 and total_grads >= 1
+        ops = []
+        with absolute_name_scope(self.scope):
+
+            # Cast gradients to FP32 and calculate partial sum within each device.
+            dev_grads = OrderedDict() # device => [(grad, var), ...]
+            for dev_idx, dev in enumerate(devices):
+                with tf.name_scope('ProcessGrads%d' % dev_idx), tf.device(dev):
+                    sums = []
+                    for gv in zip(*self._dev_grads[dev]):
+                        assert all(v is gv[0][1] for g, v in gv)
+                        g = [tf.cast(g, tf.float32) for g, v in gv]
+                        g = g[0] if len(g) == 1 else tf.add_n(g)
+                        sums.append((g, gv[0][1]))
+                    dev_grads[dev] = sums
+
+            # Sum gradients across devices.
+            if len(devices) > 1:
+                with tf.name_scope('SumAcrossGPUs'), tf.device(None):
+                    for var_idx, grad_shape in enumerate(self._grad_shapes):
+                        g = [dev_grads[dev][var_idx][0] for dev in devices]
+                        if np.prod(grad_shape): # nccl does not support zero-sized tensors
+                            g = tf.contrib.nccl.all_sum(g)
+                        for dev, gg in zip(devices, g):
+                            dev_grads[dev][var_idx] = (gg, dev_grads[dev][var_idx][1])
+
+            # Apply updates separately on each device.
+            for dev_idx, (dev, grads) in enumerate(dev_grads.items()):
+                with tf.name_scope('ApplyGrads%d' % dev_idx), tf.device(dev):
+
+                    # Scale gradients as needed.
+                    if self.use_loss_scaling or total_grads > 1:
+                        with tf.name_scope('Scale'):
+                            coef = tf.constant(np.float32(1.0 / total_grads), name='coef')
+                            coef = self.undo_loss_scaling(coef)
+                            grads = [(g * coef, v) for g, v in grads]
+
+                    # Check for overflows.
+                    with tf.name_scope('CheckOverflow'):
+                        grad_ok = tf.reduce_all(tf.stack([tf.reduce_all(tf.is_finite(g)) for g, v in grads]))
+
+                    # Update weights and adjust loss scaling.
+                    with tf.name_scope('UpdateWeights'):
+                        opt = self._dev_opt[dev]
+                        ls_var = self.get_loss_scaling_var(dev)
+                        if not self.use_loss_scaling:
+                            ops.append(tf.cond(grad_ok, lambda: opt.apply_gradients(grads), tf.no_op))
+                        else:
+                            ops.append(tf.cond(grad_ok,
+                                lambda: tf.group(tf.assign_add(ls_var, self.loss_scaling_inc), opt.apply_gradients(grads)),
+                                lambda: tf.group(tf.assign_sub(ls_var, self.loss_scaling_dec))))
+
+                    # Report statistics on the last device.
+                    if dev == devices[-1]:
+                        with tf.name_scope('Statistics'):
+                            ops.append(autosummary(self.id + '/learning_rate', self.learning_rate))
+                            ops.append(autosummary(self.id + '/overflow_frequency', tf.where(grad_ok, 0, 1)))
+                            if self.use_loss_scaling:
+                                ops.append(autosummary(self.id + '/loss_scaling_log2', ls_var))
+
+            # Initialize variables and group everything into a single op.
+            self.reset_optimizer_state()
+            init_uninited_vars(list(self._dev_ls_var.values()))
+            return tf.group(*ops, name='TrainingOp')
+
+    # Reset internal state of the underlying optimizer.
+    def reset_optimizer_state(self):
+        run([var.initializer for opt in self._dev_opt.values() for var in opt.variables()])
+
+    # Get or create variable representing log2 of the current dynamic loss scaling factor.
+    def get_loss_scaling_var(self, device):
+        if not self.use_loss_scaling:
+            return None
+        if device not in self._dev_ls_var:
+            with absolute_name_scope(self.scope + '/LossScalingVars'), tf.control_dependencies(None):
+                self._dev_ls_var[device] = tf.Variable(np.float32(self.loss_scaling_init), name='loss_scaling_var')
+        return self._dev_ls_var[device]
+
+    # Apply dynamic loss scaling for the given expression.
+    def apply_loss_scaling(self, value):
+        assert is_tf_expression(value)
+        if not self.use_loss_scaling:
+            return value
+        return value * exp2(self.get_loss_scaling_var(value.device))
+
+    # Undo the effect of dynamic loss scaling for the given expression.
+    def undo_loss_scaling(self, value):
+        assert is_tf_expression(value)
+        if not self.use_loss_scaling:
+            return value
+        return value * exp2(-self.get_loss_scaling_var(value.device))
+
+#----------------------------------------------------------------------------
+# Generic network abstraction.
+#
+# Acts as a convenience wrapper for a parameterized network construction
+# function, providing several utility methods and convenient access to
+# the inputs/outputs/weights.
+#
+# Network objects can be safely pickled and unpickled for long-term
+# archival purposes. The pickling works reliably as long as the underlying
+# network construction function is defined in a standalone Python module
+# that has no side effects or application-specific imports.
+
+network_import_handlers = []    # Custom import handlers for dealing with legacy data in pickle import.
+_network_import_modules = []    # Temporary modules create during pickle import.
+
+class Network:
+    def __init__(self,
+        name=None,          # Network name. Used to select TensorFlow name and variable scopes.
+        func=None,          # Fully qualified name of the underlying network construction function.
+        **static_kwargs):   # Keyword arguments to be passed in to the network construction function.
+
+        self._init_fields()
+        self.name = name
+        self.static_kwargs = dict(static_kwargs)
+
+        # Init build func.
+        module, self._build_func_name = import_module(func)
+        self._build_module_src = inspect.getsource(module)
+        self._build_func = find_obj_in_module(module, self._build_func_name)
+
+        # Init graph.
+        self._init_graph()
+        self.reset_vars()
+
+    def _init_fields(self):
+        self.name               = None          # User-specified name, defaults to build func name if None.
+        self.scope              = None          # Unique TF graph scope, derived from the user-specified name.
+        self.static_kwargs      = dict()        # Arguments passed to the user-supplied build func.
+        self.num_inputs         = 0             # Number of input tensors.
+        self.num_outputs        = 0             # Number of output tensors.
+        self.input_shapes       = [[]]          # Input tensor shapes (NC or NCHW), including minibatch dimension.
+        self.output_shapes      = [[]]          # Output tensor shapes (NC or NCHW), including minibatch dimension.
+        self.input_shape        = []            # Short-hand for input_shapes[0].
+        self.output_shape       = []            # Short-hand for output_shapes[0].
+        self.input_templates    = []            # Input placeholders in the template graph.
+        self.output_templates   = []            # Output tensors in the template graph.
+        self.input_names        = []            # Name string for each input.
+        self.output_names       = []            # Name string for each output.
+        self.vars               = OrderedDict() # All variables (localname => var).
+        self.trainables         = OrderedDict() # Trainable variables (localname => var).
+        self._build_func        = None          # User-supplied build function that constructs the network.
+        self._build_func_name   = None          # Name of the build function.
+        self._build_module_src  = None          # Full source code of the module containing the build function.
+        self._run_cache         = dict()        # Cached graph data for Network.run().
+        
+    def _init_graph(self):
+        # Collect inputs.
+        self.input_names = []
+        for param in inspect.signature(self._build_func).parameters.values():
+            if param.kind == param.POSITIONAL_OR_KEYWORD and param.default is param.empty:
+                self.input_names.append(param.name)
+        self.num_inputs = len(self.input_names)
+        assert self.num_inputs >= 1
+
+        # Choose name and scope.
+        if self.name is None:
+            self.name = self._build_func_name
+        self.scope = tf.get_default_graph().unique_name(self.name.replace('/', '_'), mark_as_used=False)
+        
+        # Build template graph.
+        with tf.variable_scope(self.scope, reuse=tf.AUTO_REUSE):
+            assert tf.get_variable_scope().name == self.scope
+            with absolute_name_scope(self.scope): # ignore surrounding name_scope
+                with tf.control_dependencies(None): # ignore surrounding control_dependencies
+                    self.input_templates = [tf.placeholder(tf.float32, name=name) for name in self.input_names]
+                    out_expr = self._build_func(*self.input_templates, is_template_graph=True, **self.static_kwargs)
+            
+        # Collect outputs.
+        assert is_tf_expression(out_expr) or isinstance(out_expr, tuple)
+        self.output_templates = [out_expr] if is_tf_expression(out_expr) else list(out_expr)
+        self.output_names = [t.name.split('/')[-1].split(':')[0] for t in self.output_templates]
+        self.num_outputs = len(self.output_templates)
+        assert self.num_outputs >= 1
+        
+        # Populate remaining fields.
+        self.input_shapes   = [shape_to_list(t.shape) for t in self.input_templates]
+        self.output_shapes  = [shape_to_list(t.shape) for t in self.output_templates]
+        self.input_shape    = self.input_shapes[0]
+        self.output_shape   = self.output_shapes[0]
+        self.vars           = OrderedDict([(self.get_var_localname(var), var) for var in tf.global_variables(self.scope + '/')])
+        self.trainables     = OrderedDict([(self.get_var_localname(var), var) for var in tf.trainable_variables(self.scope + '/')])
+
+    # Run initializers for all variables defined by this network.
+    def reset_vars(self):
+        run([var.initializer for var in self.vars.values()])
+
+    # Run initializers for all trainable variables defined by this network.
+    def reset_trainables(self):
+        run([var.initializer for var in self.trainables.values()])
+
+    # Get TensorFlow expression(s) for the output(s) of this network, given the inputs.
+    def get_output_for(self, *in_expr, return_as_list=False, **dynamic_kwargs):
+        assert len(in_expr) == self.num_inputs
+        all_kwargs = dict(self.static_kwargs)
+        all_kwargs.update(dynamic_kwargs)
+        with tf.variable_scope(self.scope, reuse=True):
+            assert tf.get_variable_scope().name == self.scope
+            named_inputs = [tf.identity(expr, name=name) for expr, name in zip(in_expr, self.input_names)]
+            out_expr = self._build_func(*named_inputs, **all_kwargs)
+        assert is_tf_expression(out_expr) or isinstance(out_expr, tuple)
+        if return_as_list:
+            out_expr = [out_expr] if is_tf_expression(out_expr) else list(out_expr)
+        return out_expr
+
+    # Get the local name of a given variable, excluding any surrounding name scopes.
+    def get_var_localname(self, var_or_globalname):
+        assert is_tf_expression(var_or_globalname) or isinstance(var_or_globalname, str)
+        globalname = var_or_globalname if isinstance(var_or_globalname, str) else var_or_globalname.name
+        assert globalname.startswith(self.scope + '/')
+        localname = globalname[len(self.scope) + 1:]
+        localname = localname.split(':')[0]
+        return localname
+
+    # Find variable by local or global name.
+    def find_var(self, var_or_localname):
+        assert is_tf_expression(var_or_localname) or isinstance(var_or_localname, str)
+        return self.vars[var_or_localname] if isinstance(var_or_localname, str) else var_or_localname
+
+    # Get the value of a given variable as NumPy array.
+    # Note: This method is very inefficient -- prefer to use tfutil.run(list_of_vars) whenever possible.
+    def get_var(self, var_or_localname):
+        return self.find_var(var_or_localname).eval()
+        
+    # Set the value of a given variable based on the given NumPy array.
+    # Note: This method is very inefficient -- prefer to use tfutil.set_vars() whenever possible.
+    def set_var(self, var_or_localname, new_value):
+        return set_vars({self.find_var(var_or_localname): new_value})
+
+    # Pickle export.
+    def __getstate__(self):
+        return {
+            'version':          2,
+            'name':             self.name,
+            'static_kwargs':    self.static_kwargs,
+            'build_module_src': self._build_module_src,
+            'build_func_name':  self._build_func_name,
+            'variables':        list(zip(self.vars.keys(), run(list(self.vars.values()))))}
+
+    # Pickle import.
+    def __setstate__(self, state):
+        self._init_fields()
+
+        # Execute custom import handlers.
+        for handler in network_import_handlers:
+            state = handler(state)
+
+        # Set basic fields.
+        assert state['version'] == 2
+        self.name = state['name']
+        self.static_kwargs = state['static_kwargs']
+        self._build_module_src = state['build_module_src']
+        self._build_func_name = state['build_func_name']
+        
+        # Parse imported module.
+        module = imp.new_module('_tfutil_network_import_module_%d' % len(_network_import_modules))
+        exec(self._build_module_src, module.__dict__)
+        self._build_func = find_obj_in_module(module, self._build_func_name)
+        _network_import_modules.append(module) # avoid gc
+        
+        # Init graph.
+        self._init_graph()
+        self.reset_vars()
+        set_vars({self.find_var(name): value for name, value in state['variables']})
+
+    # Create a clone of this network with its own copy of the variables.
+    def clone(self, name=None):
+        net = object.__new__(Network)
+        net._init_fields()
+        net.name = name if name is not None else self.name
+        net.static_kwargs = dict(self.static_kwargs)
+        net._build_module_src = self._build_module_src
+        net._build_func_name = self._build_func_name
+        net._build_func = self._build_func
+        net._init_graph()
+        net.copy_vars_from(self)
+        return net
+
+    # Copy the values of all variables from the given network.
+    def copy_vars_from(self, src_net):
+        assert isinstance(src_net, Network)
+        name_to_value = run({name: src_net.find_var(name) for name in self.vars.keys()})
+        set_vars({self.find_var(name): value for name, value in name_to_value.items()})
+
+    # Copy the values of all trainable variables from the given network.
+    def copy_trainables_from(self, src_net):
+        assert isinstance(src_net, Network)
+        name_to_value = run({name: src_net.find_var(name) for name in self.trainables.keys()})
+        set_vars({self.find_var(name): value for name, value in name_to_value.items()})
+
+    # Create new network with the given parameters, and copy all variables from this network.
+    def convert(self, name=None, func=None, **static_kwargs):
+        net = Network(name, func, **static_kwargs)
+        net.copy_vars_from(self)
+        return net
+
+    # Construct a TensorFlow op that updates the variables of this network
+    # to be slightly closer to those of the given network.
+    def setup_as_moving_average_of(self, src_net, beta=0.99, beta_nontrainable=0.0):
+        assert isinstance(src_net, Network)
+        with absolute_name_scope(self.scope):
+            with tf.name_scope('MovingAvg'):
+                ops = []
+                for name, var in self.vars.items():
+                    if name in src_net.vars:
+                        cur_beta = beta if name in self.trainables else beta_nontrainable
+                        new_value = lerp(src_net.vars[name], var, cur_beta)
+                        ops.append(var.assign(new_value))
+                return tf.group(*ops)
+
+    # Run this network for the given NumPy array(s), and return the output(s) as NumPy array(s).
+    def run(self, *in_arrays,
+        return_as_list  = False,    # True = return a list of NumPy arrays, False = return a single NumPy array, or a tuple if there are multiple outputs.
+        print_progress  = False,    # Print progress to the console? Useful for very large input arrays.
+        minibatch_size  = None,     # Maximum minibatch size to use, None = disable batching.
+        num_gpus        = 1,        # Number of GPUs to use.
+        out_mul         = 1.0,      # Multiplicative constant to apply to the output(s).
+        out_add         = 0.0,      # Additive constant to apply to the output(s).
+        out_shrink      = 1,        # Shrink the spatial dimensions of the output(s) by the given factor.
+        out_dtype       = None,     # Convert the output to the specified data type.
+        **dynamic_kwargs):          # Additional keyword arguments to pass into the network construction function.
+
+        assert len(in_arrays) == self.num_inputs
+        num_items = in_arrays[0].shape[0]
+        if minibatch_size is None:
+            minibatch_size = num_items
+        key = str([list(sorted(dynamic_kwargs.items())), num_gpus, out_mul, out_add, out_shrink, out_dtype])
+
+        # Build graph.
+        if key not in self._run_cache:
+            with absolute_name_scope(self.scope + '/Run'), tf.control_dependencies(None):
+                in_split = list(zip(*[tf.split(x, num_gpus) for x in self.input_templates]))
+                out_split = []
+                for gpu in range(num_gpus):
+                    with tf.device('/gpu:%d' % gpu):
+                        out_expr = self.get_output_for(*in_split[gpu], return_as_list=True, **dynamic_kwargs)
+                        if out_mul != 1.0:
+                            out_expr = [x * out_mul for x in out_expr]
+                        if out_add != 0.0:
+                            out_expr = [x + out_add for x in out_expr]
+                        if out_shrink > 1:
+                            ksize = [1, 1, out_shrink, out_shrink]
+                            out_expr = [tf.nn.avg_pool(x, ksize=ksize, strides=ksize, padding='VALID', data_format='NCHW') for x in out_expr]
+                        if out_dtype is not None:
+                            if tf.as_dtype(out_dtype).is_integer:
+                                out_expr = [tf.round(x) for x in out_expr]
+                            out_expr = [tf.saturate_cast(x, out_dtype) for x in out_expr]
+                        out_split.append(out_expr)
+                self._run_cache[key] = [tf.concat(outputs, axis=0) for outputs in zip(*out_split)]
+
+        # Run minibatches.
+        out_expr = self._run_cache[key]
+        out_arrays = [np.empty([num_items] + shape_to_list(expr.shape)[1:], expr.dtype.name) for expr in out_expr]
+        for mb_begin in range(0, num_items, minibatch_size):
+            if print_progress:
+                print('\r%d / %d' % (mb_begin, num_items), end='')
+            mb_end = min(mb_begin + minibatch_size, num_items)
+            mb_in = [src[mb_begin : mb_end] for src in in_arrays]
+            mb_out = tf.get_default_session().run(out_expr, dict(zip(self.input_templates, mb_in)))
+            for dst, src in zip(out_arrays, mb_out):
+                dst[mb_begin : mb_end] = src
+
+        # Done.
+        if print_progress:
+            print('\r%d / %d' % (num_items, num_items))
+        if not return_as_list:
+            out_arrays = out_arrays[0] if len(out_arrays) == 1 else tuple(out_arrays)
+        return out_arrays
+
+    # Returns a list of (name, output_expr, trainable_vars) tuples corresponding to
+    # individual layers of the network. Mainly intended to be used for reporting.
+    def list_layers(self):
+        patterns_to_ignore = ['/Setter', '/new_value', '/Shape', '/strided_slice', '/Cast', '/concat']
+        all_ops = tf.get_default_graph().get_operations()
+        all_ops = [op for op in all_ops if not any(p in op.name for p in patterns_to_ignore)]
+        layers = []
+
+        def recurse(scope, parent_ops, level):
+            prefix = scope + '/'
+            ops = [op for op in parent_ops if op.name == scope or op.name.startswith(prefix)]
+
+            # Does not contain leaf nodes => expand immediate children.
+            if level == 0 or all('/' in op.name[len(prefix):] for op in ops):
+                visited = set()
+                for op in ops:
+                    suffix = op.name[len(prefix):]
+                    if '/' in suffix:
+                        suffix = suffix[:suffix.index('/')]
+                    if suffix not in visited:
+                        recurse(prefix + suffix, ops, level + 1)
+                        visited.add(suffix)
+
+            # Otherwise => interpret as a layer.
+            else:
+                layer_name = scope[len(self.scope)+1:]
+                layer_output = ops[-1].outputs[0]
+                layer_trainables = [op.outputs[0] for op in ops if op.type.startswith('Variable') and self.get_var_localname(op.name) in self.trainables]
+                layers.append((layer_name, layer_output, layer_trainables))
+
+        recurse(self.scope, all_ops, 0)
+        return layers
+
+    # Print a summary table of the network structure.
+    def print_layers(self, title=None, hide_layers_with_no_params=False):
+        if title is None: title = self.name
+        print()
+        print('%-28s%-12s%-24s%-24s' % (title, 'Params', 'OutputShape', 'WeightShape'))
+        print('%-28s%-12s%-24s%-24s' % (('---',) * 4))
+
+        total_params = 0
+        for layer_name, layer_output, layer_trainables in self.list_layers():
+            weights = [var for var in layer_trainables if var.name.endswith('/weight:0')]
+            num_params = sum(np.prod(shape_to_list(var.shape)) for var in layer_trainables)
+            total_params += num_params
+            if hide_layers_with_no_params and num_params == 0:
+                continue
+
+            print('%-28s%-12s%-24s%-24s' % (
+                layer_name,
+                num_params if num_params else '-',
+                layer_output.shape,
+                weights[0].shape if len(weights) == 1 else '-'))
+
+        print('%-28s%-12s%-24s%-24s' % (('---',) * 4))
+        print('%-28s%-12s%-24s%-24s' % ('Total', total_params, '', ''))
+        print()
+
+    # Construct summary ops to include histograms of all trainable parameters in TensorBoard.
+    def setup_weight_histograms(self, title=None):
+        if title is None: title = self.name
+        with tf.name_scope(None), tf.device(None), tf.control_dependencies(None):
+            for localname, var in self.trainables.items():
+                if '/' in localname:
+                    p = localname.split('/')
+                    name = title + '_' + p[-1] + '/' + '_'.join(p[:-1])
+                else:
+                    name = title + '_toplevel/' + localname
+                tf.summary.histogram(name, var)
+
+#----------------------------------------------------------------------------

models/pggan_tf_official/train.py

@@ -0,0 +1,288 @@
+# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# This work is licensed under the Creative Commons Attribution-NonCommercial
+# 4.0 International License. To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to
+# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+import os
+import time
+import numpy as np
+import tensorflow as tf
+
+import config
+import tfutil
+import dataset
+import misc
+
+#----------------------------------------------------------------------------
+# Choose the size and contents of the image snapshot grids that are exported
+# periodically during training.
+
+def setup_snapshot_image_grid(G, training_set,
+    size    = '1080p',      # '1080p' = to be viewed on 1080p display, '4k' = to be viewed on 4k display.
+    layout  = 'random'):    # 'random' = grid contents are selected randomly, 'row_per_class' = each row corresponds to one class label.
+
+    # Select size.
+    gw = 1; gh = 1
+    if size == '1080p':
+        gw = np.clip(1920 // G.output_shape[3], 3, 32)
+        gh = np.clip(1080 // G.output_shape[2], 2, 32)
+    if size == '4k':
+        gw = np.clip(3840 // G.output_shape[3], 7, 32)
+        gh = np.clip(2160 // G.output_shape[2], 4, 32)
+
+    # Fill in reals and labels.
+    reals = np.zeros([gw * gh] + training_set.shape, dtype=training_set.dtype)
+    labels = np.zeros([gw * gh, training_set.label_size], dtype=training_set.label_dtype)
+    for idx in range(gw * gh):
+        x = idx % gw; y = idx // gw
+        while True:
+            real, label = training_set.get_minibatch_np(1)
+            if layout == 'row_per_class' and training_set.label_size > 0:
+                if label[0, y % training_set.label_size] == 0.0:
+                    continue
+            reals[idx] = real[0]
+            labels[idx] = label[0]
+            break
+
+    # Generate latents.
+    latents = misc.random_latents(gw * gh, G)
+    return (gw, gh), reals, labels, latents
+
+#----------------------------------------------------------------------------
+# Just-in-time processing of training images before feeding them to the networks.
+
+def process_reals(x, lod, mirror_augment, drange_data, drange_net):
+    with tf.name_scope('ProcessReals'):
+        with tf.name_scope('DynamicRange'):
+            x = tf.cast(x, tf.float32)
+            x = misc.adjust_dynamic_range(x, drange_data, drange_net)
+        if mirror_augment:
+            with tf.name_scope('MirrorAugment'):
+                s = tf.shape(x)
+                mask = tf.random_uniform([s[0], 1, 1, 1], 0.0, 1.0)
+                mask = tf.tile(mask, [1, s[1], s[2], s[3]])
+                x = tf.where(mask < 0.5, x, tf.reverse(x, axis=[3]))
+        with tf.name_scope('FadeLOD'): # Smooth crossfade between consecutive levels-of-detail.
+            s = tf.shape(x)
+            y = tf.reshape(x, [-1, s[1], s[2]//2, 2, s[3]//2, 2])
+            y = tf.reduce_mean(y, axis=[3, 5], keepdims=True)
+            y = tf.tile(y, [1, 1, 1, 2, 1, 2])
+            y = tf.reshape(y, [-1, s[1], s[2], s[3]])
+            x = tfutil.lerp(x, y, lod - tf.floor(lod))
+        with tf.name_scope('UpscaleLOD'): # Upscale to match the expected input/output size of the networks.
+            s = tf.shape(x)
+            factor = tf.cast(2 ** tf.floor(lod), tf.int32)
+            x = tf.reshape(x, [-1, s[1], s[2], 1, s[3], 1])
+            x = tf.tile(x, [1, 1, 1, factor, 1, factor])
+            x = tf.reshape(x, [-1, s[1], s[2] * factor, s[3] * factor])
+        return x
+
+#----------------------------------------------------------------------------
+# Class for evaluating and storing the values of time-varying training parameters.
+
+class TrainingSchedule:
+    def __init__(
+        self,
+        cur_nimg,
+        training_set,
+        lod_initial_resolution  = 4,        # Image resolution used at the beginning.
+        lod_training_kimg       = 600,      # Thousands of real images to show before doubling the resolution.
+        lod_transition_kimg     = 600,      # Thousands of real images to show when fading in new layers.
+        minibatch_base          = 16,       # Maximum minibatch size, divided evenly among GPUs.
+        minibatch_dict          = {},       # Resolution-specific overrides.
+        max_minibatch_per_gpu   = {},       # Resolution-specific maximum minibatch size per GPU.
+        G_lrate_base            = 0.001,    # Learning rate for the generator.
+        G_lrate_dict            = {},       # Resolution-specific overrides.
+        D_lrate_base            = 0.001,    # Learning rate for the discriminator.
+        D_lrate_dict            = {},       # Resolution-specific overrides.
+        tick_kimg_base          = 160,      # Default interval of progress snapshots.
+        tick_kimg_dict          = {4: 160, 8:140, 16:120, 32:100, 64:80, 128:60, 256:40, 512:20, 1024:10}): # Resolution-specific overrides.
+
+        # Training phase.
+        self.kimg = cur_nimg / 1000.0
+        phase_dur = lod_training_kimg + lod_transition_kimg
+        phase_idx = int(np.floor(self.kimg / phase_dur)) if phase_dur > 0 else 0
+        phase_kimg = self.kimg - phase_idx * phase_dur
+
+        # Level-of-detail and resolution.
+        self.lod = training_set.resolution_log2
+        self.lod -= np.floor(np.log2(lod_initial_resolution))
+        self.lod -= phase_idx
+        if lod_transition_kimg > 0:
+            self.lod -= max(phase_kimg - lod_training_kimg, 0.0) / lod_transition_kimg
+        self.lod = max(self.lod, 0.0)
+        self.resolution = 2 ** (training_set.resolution_log2 - int(np.floor(self.lod)))
+
+        # Minibatch size.
+        self.minibatch = minibatch_dict.get(self.resolution, minibatch_base)
+        self.minibatch -= self.minibatch % config.num_gpus
+        if self.resolution in max_minibatch_per_gpu:
+            self.minibatch = min(self.minibatch, max_minibatch_per_gpu[self.resolution] * config.num_gpus)
+
+        # Other parameters.
+        self.G_lrate = G_lrate_dict.get(self.resolution, G_lrate_base)
+        self.D_lrate = D_lrate_dict.get(self.resolution, D_lrate_base)
+        self.tick_kimg = tick_kimg_dict.get(self.resolution, tick_kimg_base)
+
+#----------------------------------------------------------------------------
+# Main training script.
+# To run, comment/uncomment appropriate lines in config.py and launch train.py.
+
+def train_progressive_gan(
+    G_smoothing             = 0.999,        # Exponential running average of generator weights.
+    D_repeats               = 1,            # How many times the discriminator is trained per G iteration.
+    minibatch_repeats       = 4,            # Number of minibatches to run before adjusting training parameters.
+    reset_opt_for_new_lod   = True,         # Reset optimizer internal state (e.g. Adam moments) when new layers are introduced?
+    total_kimg              = 15000,        # Total length of the training, measured in thousands of real images.
+    mirror_augment          = False,        # Enable mirror augment?
+    drange_net              = [-1,1],       # Dynamic range used when feeding image data to the networks.
+    image_snapshot_ticks    = 1,            # How often to export image snapshots?
+    network_snapshot_ticks  = 10,           # How often to export network snapshots?
+    save_tf_graph           = False,        # Include full TensorFlow computation graph in the tfevents file?
+    save_weight_histograms  = False,        # Include weight histograms in the tfevents file?
+    resume_run_id           = None,         # Run ID or network pkl to resume training from, None = start from scratch.
+    resume_snapshot         = None,         # Snapshot index to resume training from, None = autodetect.
+    resume_kimg             = 0.0,          # Assumed training progress at the beginning. Affects reporting and training schedule.
+    resume_time             = 0.0):         # Assumed wallclock time at the beginning. Affects reporting.
+
+    maintenance_start_time = time.time()
+    training_set = dataset.load_dataset(data_dir=config.data_dir, verbose=True, **config.dataset)
+
+    # Construct networks.
+    with tf.device('/gpu:0'):
+        if resume_run_id is not None:
+            network_pkl = misc.locate_network_pkl(resume_run_id, resume_snapshot)
+            print('Loading networks from "%s"...' % network_pkl)
+            G, D, Gs = misc.load_pkl(network_pkl)
+        else:
+            print('Constructing networks...')
+            G = tfutil.Network('G', num_channels=training_set.shape[0], resolution=training_set.shape[1], label_size=training_set.label_size, **config.G)
+            D = tfutil.Network('D', num_channels=training_set.shape[0], resolution=training_set.shape[1], label_size=training_set.label_size, **config.D)
+            Gs = G.clone('Gs')
+        Gs_update_op = Gs.setup_as_moving_average_of(G, beta=G_smoothing)
+    G.print_layers(); D.print_layers()
+
+    print('Building TensorFlow graph...')
+    with tf.name_scope('Inputs'):
+        lod_in          = tf.placeholder(tf.float32, name='lod_in', shape=[])
+        lrate_in        = tf.placeholder(tf.float32, name='lrate_in', shape=[])
+        minibatch_in    = tf.placeholder(tf.int32, name='minibatch_in', shape=[])
+        minibatch_split = minibatch_in // config.num_gpus
+        reals, labels   = training_set.get_minibatch_tf()
+        reals_split     = tf.split(reals, config.num_gpus)
+        labels_split    = tf.split(labels, config.num_gpus)
+    G_opt = tfutil.Optimizer(name='TrainG', learning_rate=lrate_in, **config.G_opt)
+    D_opt = tfutil.Optimizer(name='TrainD', learning_rate=lrate_in, **config.D_opt)
+    for gpu in range(config.num_gpus):
+        with tf.name_scope('GPU%d' % gpu), tf.device('/gpu:%d' % gpu):
+            G_gpu = G if gpu == 0 else G.clone(G.name + '_shadow')
+            D_gpu = D if gpu == 0 else D.clone(D.name + '_shadow')
+            lod_assign_ops = [tf.assign(G_gpu.find_var('lod'), lod_in), tf.assign(D_gpu.find_var('lod'), lod_in)]
+            reals_gpu = process_reals(reals_split[gpu], lod_in, mirror_augment, training_set.dynamic_range, drange_net)
+            labels_gpu = labels_split[gpu]
+            with tf.name_scope('G_loss'), tf.control_dependencies(lod_assign_ops):
+                G_loss = tfutil.call_func_by_name(G=G_gpu, D=D_gpu, opt=G_opt, training_set=training_set, minibatch_size=minibatch_split, **config.G_loss)
+            with tf.name_scope('D_loss'), tf.control_dependencies(lod_assign_ops):
+                D_loss = tfutil.call_func_by_name(G=G_gpu, D=D_gpu, opt=D_opt, training_set=training_set, minibatch_size=minibatch_split, reals=reals_gpu, labels=labels_gpu, **config.D_loss)
+            G_opt.register_gradients(tf.reduce_mean(G_loss), G_gpu.trainables)
+            D_opt.register_gradients(tf.reduce_mean(D_loss), D_gpu.trainables)
+    G_train_op = G_opt.apply_updates()
+    D_train_op = D_opt.apply_updates()
+
+    print('Setting up snapshot image grid...')
+    grid_size, grid_reals, grid_labels, grid_latents = setup_snapshot_image_grid(G, training_set, **config.grid)
+    sched = TrainingSchedule(total_kimg * 1000, training_set, **config.sched)
+    grid_fakes = Gs.run(grid_latents, grid_labels, minibatch_size=sched.minibatch//config.num_gpus)
+
+    print('Setting up result dir...')
+    result_subdir = misc.create_result_subdir(config.result_dir, config.desc)
+    misc.save_image_grid(grid_reals, os.path.join(result_subdir, 'reals.png'), drange=training_set.dynamic_range, grid_size=grid_size)
+    misc.save_image_grid(grid_fakes, os.path.join(result_subdir, 'fakes%06d.png' % 0), drange=drange_net, grid_size=grid_size)
+    summary_log = tf.summary.FileWriter(result_subdir)
+    if save_tf_graph:
+        summary_log.add_graph(tf.get_default_graph())
+    if save_weight_histograms:
+        G.setup_weight_histograms(); D.setup_weight_histograms()
+
+    print('Training...')
+    cur_nimg = int(resume_kimg * 1000)
+    cur_tick = 0
+    tick_start_nimg = cur_nimg
+    tick_start_time = time.time()
+    train_start_time = tick_start_time - resume_time
+    prev_lod = -1.0
+    while cur_nimg < total_kimg * 1000:
+
+        # Choose training parameters and configure training ops.
+        sched = TrainingSchedule(cur_nimg, training_set, **config.sched)
+        training_set.configure(sched.minibatch, sched.lod)
+        if reset_opt_for_new_lod:
+            if np.floor(sched.lod) != np.floor(prev_lod) or np.ceil(sched.lod) != np.ceil(prev_lod):
+                G_opt.reset_optimizer_state(); D_opt.reset_optimizer_state()
+        prev_lod = sched.lod
+
+        # Run training ops.
+        for repeat in range(minibatch_repeats):
+            for _ in range(D_repeats):
+                tfutil.run([D_train_op, Gs_update_op], {lod_in: sched.lod, lrate_in: sched.D_lrate, minibatch_in: sched.minibatch})
+                cur_nimg += sched.minibatch
+            tfutil.run([G_train_op], {lod_in: sched.lod, lrate_in: sched.G_lrate, minibatch_in: sched.minibatch})
+
+        # Perform maintenance tasks once per tick.
+        done = (cur_nimg >= total_kimg * 1000)
+        if cur_nimg >= tick_start_nimg + sched.tick_kimg * 1000 or done:
+            cur_tick += 1
+            cur_time = time.time()
+            tick_kimg = (cur_nimg - tick_start_nimg) / 1000.0
+            tick_start_nimg = cur_nimg
+            tick_time = cur_time - tick_start_time
+            total_time = cur_time - train_start_time
+            maintenance_time = tick_start_time - maintenance_start_time
+            maintenance_start_time = cur_time
+
+            # Report progress.
+            print('tick %-5d kimg %-8.1f lod %-5.2f minibatch %-4d time %-12s sec/tick %-7.1f sec/kimg %-7.2f maintenance %.1f' % (
+                tfutil.autosummary('Progress/tick', cur_tick),
+                tfutil.autosummary('Progress/kimg', cur_nimg / 1000.0),
+                tfutil.autosummary('Progress/lod', sched.lod),
+                tfutil.autosummary('Progress/minibatch', sched.minibatch),
+                misc.format_time(tfutil.autosummary('Timing/total_sec', total_time)),
+                tfutil.autosummary('Timing/sec_per_tick', tick_time),
+                tfutil.autosummary('Timing/sec_per_kimg', tick_time / tick_kimg),
+                tfutil.autosummary('Timing/maintenance_sec', maintenance_time)))
+            tfutil.autosummary('Timing/total_hours', total_time / (60.0 * 60.0))
+            tfutil.autosummary('Timing/total_days', total_time / (24.0 * 60.0 * 60.0))
+            tfutil.save_summaries(summary_log, cur_nimg)
+
+            # Save snapshots.
+            if cur_tick % image_snapshot_ticks == 0 or done:
+                grid_fakes = Gs.run(grid_latents, grid_labels, minibatch_size=sched.minibatch//config.num_gpus)
+                misc.save_image_grid(grid_fakes, os.path.join(result_subdir, 'fakes%06d.png' % (cur_nimg // 1000)), drange=drange_net, grid_size=grid_size)
+            if cur_tick % network_snapshot_ticks == 0 or done:
+                misc.save_pkl((G, D, Gs), os.path.join(result_subdir, 'network-snapshot-%06d.pkl' % (cur_nimg // 1000)))
+
+            # Record start time of the next tick.
+            tick_start_time = time.time()
+
+    # Write final results.
+    misc.save_pkl((G, D, Gs), os.path.join(result_subdir, 'network-final.pkl'))
+    summary_log.close()
+    open(os.path.join(result_subdir, '_training-done.txt'), 'wt').close()
+
+#----------------------------------------------------------------------------
+# Main entry point.
+# Calls the function indicated in config.py.
+
+if __name__ == "__main__":
+    misc.init_output_logging()
+    np.random.seed(config.random_seed)
+    print('Initializing TensorFlow...')
+    os.environ.update(config.env)
+    tfutil.init_tf(config.tf_config)
+    print('Running %s()...' % config.train['func'])
+    tfutil.call_func_by_name(**config.train)
+    print('Exiting...')
+
+#----------------------------------------------------------------------------