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import math
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from inspect import isfunction
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import torch
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from torch import nn
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import torch.distributed as dist
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def gather_data(data, return_np=True):
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''' gather data from multiple processes to one list '''
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data_list = [torch.zeros_like(data) for _ in range(dist.get_world_size())]
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dist.all_gather(data_list, data)
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if return_np:
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data_list = [data.cpu().numpy() for data in data_list]
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return data_list
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def autocast(f):
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def do_autocast(*args, **kwargs):
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with torch.cuda.amp.autocast(enabled=True,
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dtype=torch.get_autocast_gpu_dtype(),
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cache_enabled=torch.is_autocast_cache_enabled()):
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return f(*args, **kwargs)
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return do_autocast
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def extract_into_tensor(a, t, x_shape):
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b, *_ = t.shape
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out = a.gather(-1, t)
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return out.reshape(b, *((1,) * (len(x_shape) - 1)))
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def noise_like(shape, device, repeat=False):
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repeat_noise = lambda: torch.randn((1, *shape[1:]), device=device).repeat(shape[0], *((1,) * (len(shape) - 1)))
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noise = lambda: torch.randn(shape, device=device)
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return repeat_noise() if repeat else noise()
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def default(val, d):
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if exists(val):
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return val
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return d() if isfunction(d) else d
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def exists(val):
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return val is not None
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def identity(*args, **kwargs):
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return nn.Identity()
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def uniq(arr):
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return{el: True for el in arr}.keys()
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def mean_flat(tensor):
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"""
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Take the mean over all non-batch dimensions.
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"""
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return tensor.mean(dim=list(range(1, len(tensor.shape))))
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def ismap(x):
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if not isinstance(x, torch.Tensor):
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return False
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return (len(x.shape) == 4) and (x.shape[1] > 3)
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def isimage(x):
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if not isinstance(x,torch.Tensor):
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return False
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return (len(x.shape) == 4) and (x.shape[1] == 3 or x.shape[1] == 1)
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def max_neg_value(t):
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return -torch.finfo(t.dtype).max
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def shape_to_str(x):
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shape_str = "x".join([str(x) for x in x.shape])
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return shape_str
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def init_(tensor):
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dim = tensor.shape[-1]
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std = 1 / math.sqrt(dim)
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tensor.uniform_(-std, std)
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return tensor
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ckpt = torch.utils.checkpoint.checkpoint
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def checkpoint(func, inputs, params, flag):
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"""
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Evaluate a function without caching intermediate activations, allowing for
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reduced memory at the expense of extra compute in the backward pass.
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:param func: the function to evaluate.
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:param inputs: the argument sequence to pass to `func`.
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:param params: a sequence of parameters `func` depends on but does not
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explicitly take as arguments.
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:param flag: if False, disable gradient checkpointing.
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"""
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if flag:
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return ckpt(func, *inputs, use_reentrant=False)
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else:
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return func(*inputs) |
