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import collections.abc as abc
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import dataclasses
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import logging
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from typing import Any
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from detectron2.utils.registry import _convert_target_to_string, locate
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__all__ = ["dump_dataclass", "instantiate"]
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def dump_dataclass(obj: Any):
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"""
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Dump a dataclass recursively into a dict that can be later instantiated.
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Args:
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obj: a dataclass object
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Returns:
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dict
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"""
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assert dataclasses.is_dataclass(obj) and not isinstance(
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obj, type
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), "dump_dataclass() requires an instance of a dataclass."
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ret = {"_target_": _convert_target_to_string(type(obj))}
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for f in dataclasses.fields(obj):
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v = getattr(obj, f.name)
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if dataclasses.is_dataclass(v):
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v = dump_dataclass(v)
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if isinstance(v, (list, tuple)):
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v = [dump_dataclass(x) if dataclasses.is_dataclass(x) else x for x in v]
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ret[f.name] = v
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return ret
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def instantiate(cfg):
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"""
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Recursively instantiate objects defined in dictionaries by
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"_target_" and arguments.
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Args:
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cfg: a dict-like object with "_target_" that defines the caller, and
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other keys that define the arguments
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Returns:
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object instantiated by cfg
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"""
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from omegaconf import ListConfig, DictConfig, OmegaConf
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if isinstance(cfg, ListConfig):
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lst = [instantiate(x) for x in cfg]
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return ListConfig(lst, flags={"allow_objects": True})
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if isinstance(cfg, list):
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return [instantiate(x) for x in cfg]
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if isinstance(cfg, DictConfig) and dataclasses.is_dataclass(cfg._metadata.object_type):
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return OmegaConf.to_object(cfg)
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if isinstance(cfg, abc.Mapping) and "_target_" in cfg:
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cfg = {k: instantiate(v) for k, v in cfg.items()}
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cls = cfg.pop("_target_")
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cls = instantiate(cls)
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if isinstance(cls, str):
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cls_name = cls
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cls = locate(cls_name)
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assert cls is not None, cls_name
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else:
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try:
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cls_name = cls.__module__ + "." + cls.__qualname__
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except Exception:
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cls_name = str(cls)
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assert callable(cls), f"_target_ {cls} does not define a callable object"
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try:
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return cls(**cfg)
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except TypeError:
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logger = logging.getLogger(__name__)
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logger.error(f"Error when instantiating {cls_name}!")
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raise
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return cfg
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