def instantiate(cfg):
    """
    Recursively instantiate objects defined in dictionaries by
    "_target_" and arguments.

    Args:
        cfg: a dict-like object with "_target_" that defines the caller, and
            other keys that define the arguments

    Returns:
        object instantiated by cfg
    """
    from omegaconf import ListConfig, DictConfig, OmegaConf

    if isinstance(cfg, ListConfig):
        lst = [instantiate(x) for x in cfg]
        return ListConfig(lst, flags={"allow_objects": True})
    if isinstance(cfg, list):
        # Specialize for list, because many classes take
        # list[objects] as arguments, such as ResNet, DatasetMapper
        return [instantiate(x) for x in cfg]

    # If input is a DictConfig backed by dataclasses (i.e. omegaconf's structured config),
    # instantiate it to the actual dataclass.
    if isinstance(cfg, DictConfig) and dataclasses.is_dataclass(cfg._metadata.object_type):
        return OmegaConf.to_object(cfg)

    if isinstance(cfg, abc.Mapping) and "_target_" in cfg:
        # conceptually equivalent to hydra.utils.instantiate(cfg) with _convert_=all,
        # but faster: https://github.com/facebookresearch/hydra/issues/1200
        cfg = {k: instantiate(v) for k, v in cfg.items()}
        cls = cfg.pop("_target_")
        cls = instantiate(cls)

        if isinstance(cls, str):
            cls_name = cls
            cls = locate(cls_name)
            assert cls is not None, cls_name
        else:
            try:
                cls_name = cls.__module__ + "." + cls.__qualname__
            except Exception:
                # target could be anything, so the above could fail
                cls_name = str(cls)
        assert callable(cls), f"_target_ {cls} does not define a callable object"
        try:
            return cls(**cfg)
        except TypeError:
            logger = logging.getLogger(__name__)
            logger.error(f"Error when instantiating {cls_name}!")
            raise
    return cfg  # return as-is if don't know what to do

    Recursively instantiate objects defined in dictionaries by
    "_target_" and arguments.

    Args:
        cfg: a dict-like object with "_target_" that defines the caller, and
            other keys that define the arguments

    Returns:
        object instantiated by cfg
    
EVA-01/det/detectron2/config/instantiate.py