Determine the minimum sequence length given a dataset_split.

    Args:
      dataset_split: A problem.DatasetSplit.

    Returns:
      The minimum length that a sequence can be for this dataset_split.

def min_sequence_length(self, dataset_split):
    """Determine the minimum sequence length given a dataset_split.

    Args:
      dataset_split: A problem.DatasetSplit.

    Returns:
      The minimum length that a sequence can be for this dataset_split.
    """
    return {
        problem.DatasetSplit.TRAIN: 8,
        problem.DatasetSplit.EVAL: 65,
        problem.DatasetSplit.TEST: 65
    }[dataset_split]