def is_melceplogf0_evaluator(evaluator_keys):
  """Are these evaluator keys from MelCepLogF0 evaluator?"""
  return (len(evaluator_keys) == 2 and
          evaluator_keys[0] == 'max_mel_cep_distortion' and
          evaluator_keys[1] == 'max_log_f0_error')