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: Un-overrides a key-value pair.
code: def remove_override(self, key: _K) -> None:
      """Un-overrides a key-value pair."""
      self._overrides.pop(key, None)  # type: ignore[arg-type]
      self._merged.pop(key, None)  # type: ignore[arg-type]
      if key in self._base:
          self._merged[key] = self._base[key]
  
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 5 for calling the OverrideDict obj's underlying member method code with example usage: obj.remove_override(key) without return types