<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_control(input, model_file=None, model_proto=None, name=None):
 """Returns true if input id is control piece. Args: input: An arbitrary tensor of int32. model_file: The sentencepiece model file path. model_proto: The sentencepiece model serialized proto. Either `model_file` or `model_proto` must be set. name: The name argument that is passed to the op function. Returns: A tensor of bool with the same shape as input. """


  return _gen_sentencepiece_processor_op.sentencepiece_get_piece_type(
      input, model_file=model_file, model_proto=model_proto, name=name,
      piece_type=1)