code: def flatten(cls, obj):
      return (obj,), cls()
  
imports: import collections
  from dataclasses import dataclass
  from typing import Callable, List, Optional, Tuple
  import torch
  from torch import nn
  from detectron2.structures import Boxes, Instances, ROIMasks
  from detectron2.utils.registry import _convert_target_to_string, locate
  from .torchscript_patch import patch_builtin_len
label_desc: Use image node_id 2 for calling the IdentitySchema obj's underlying member method code with example usage: obj.flatten(cls, obj) and returns: obj,  cls