message: tf.lite.experimental.convert_op_hints_to_stubs is now tf.compat.v1.lite.experimental.convert_op_hints_to_stubs
diff: @@ -93,7 +93,7 @@ def toco_convert(options, graph_def, input_tensors, output_tensors, **kwargs):
  or None, log_txt if it did not convert properly.
  """
  # Convert ophint ops if presented.
  - graph_def = tf.lite.experimental.convert_op_hints_to_stubs(
  + graph_def = tf.compat.v1.lite.experimental.convert_op_hints_to_stubs(
  graph_def=graph_def)
  graph_def_str = graph_def.SerializeToString()
  