parameters: (meta_graph_def, op_signature_key, import_scope)
docstring: Retrieve op stored in the imported meta graph's signature def.
docstring_summary: Retrieve op stored in the imported meta graph's signature def.
docstring_tokens: Retrieve op stored in the imported meta graph s signature def .
function: def _get_op_from_signature_def(meta_graph_def, op_signature_key, import_scope):
    """Retrieve op stored in the imported meta graph's signature def."""
    if op_signature_key in meta_graph_def.signature_def:
      return signature_def_utils.load_op_from_signature_def(
          meta_graph_def.signature_def[op_signature_key], op_signature_key,
          import_scope)
    else:
      return None
function_tokens: def _get_op_from_signature_def ( meta_graph_def , op_signature_key , import_scope ) : if op_signature_key in meta_graph_def . signature_def : return signature_def_utils . load_op_from_signature_def ( meta_graph_def . signature_def [ op_signature_key ] , op_signature_key , import_scope ) else : return None