Args:
      func: A FunctionDef object.

    Returns:
      True iff `func` is composte function.
    """
    return func.signature.name.startswith('composite_')

  def _contains_op_with_name_and_attribute(
      self,
      nodes: Iterable[node_def_pb2.NodeDef],
      op_name: str,
      attr_name: str,
      attr_val: _AttrValType,
      node_name: str = '',
  ) -> bool:

      if alias == 'conv_func':
        for func in meta_graph_def.graph_def.library.function:
          if func.signature.name == func_name:
            self.assertTrue(
                self._contains_op_with_name_and_attribute(
                    func.node_def,
                    op_name='XlaConvV2',
                    attr_name='',
                    attr_val=None,
                )
            )