message: Throw error for using tflite_convert with the command line.
diff: @@ -25,6 +25,7 @@ import sys
  from tensorflow.lite.python import lite
  from tensorflow.lite.python import lite_constants
  from tensorflow.lite.toco import toco_flags_pb2 as _toco_flags_pb2
  +from tensorflow.python import tf2
  from tensorflow.python.platform import app
  @@ -258,6 +259,11 @@ def _check_flags(flags, unparsed):
  def run_main(_):
  """Main in toco_convert.py."""
  + if tf2.enabled():
  + raise ValueError("tflite_convert is currently unsupported in 2.0. "
  + "Please use the Python API "
  + "tf.lite.TFLiteConverter.from_concrete_function().")
  +
  parser = argparse.ArgumentParser(
  description=("Command line tool to run TensorFlow Lite Optimizing "
  "Converter (TOCO)."))
  