message: Add nested function nodes checking logic for QAT validator.
diff: @@ -417,6 +417,10 @@ class QuantizationMode(object):
  for node_def in self._graph_def.node:
  if node_def.op in training_quant_ops:
  return True
  + for function in self._graph_def.library.function:
  + for node_def in function.node_def:
  + if node_def.op in training_quant_ops:
  + return True
  return False
  