code: 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
  
imports: import collections.abc
  import dataclasses
  import logging
  from typing import Any
  from detectron2.utils.registry import _convert_target_to_string, locate
label_desc: Use image node_id 2 for calling a global function with example usage: instantiate(cfg) and returns: cfg, ListConfig, unknown, OmegaConf, cls