class_docstr: A dict with a mutation flag.
code: def mutated(self):
      return self._mutated
  
imports: import collections
  import functools
  from typing import Any, Callable, Hashable, Mapping, Optional
  from tensorflow.core.function import trace_type
  from tensorflow.python import pywrap_tfe
  from tensorflow.python.framework import dtypes
  from tensorflow.python.types import core
  from tensorflow.python.util import object_identity
label_desc: Use image node_id 6 for calling the MutationAwareDict obj's underlying member method code with example usage: obj.mutated() and returns: self