class_docstr: A dictionary that merges built-in and custom symbolic functions.
  
  It supports overriding and un-overriding built-in symbolic functions with custom
  ones.
docstr: Overrides a base key-value with a new pair.
code: def override(self, key: _K, value: _V) -> None:
      """Overrides a base key-value with a new pair."""
      self._overrides[key] = value
      self._merged[key] = value
  
imports: import warnings
  from typing import Callable, Collection, Dict, Generic, Optional, Sequence, Set, TypeVar, Union
  from torch.onnx import _constants, errors
  from torch.onnx._internal import _beartype
label_desc: Use image node_id 4 for calling the OverrideDict obj's underlying member method code with example usage: obj.override(key, value) without return types