def METHOD_NAME(generated_field, ground_truth_field):
    """
    Referenced from NMT evaluation
    Note 13a is the default tokenizer for English for WMT
    Known issue that it doesn't hand edge case of None or '' 
    https://github.com/mjpost/sacrebleu/issues/161
    """
    valid_indices = [i for i in range(len(generated_field)) if generated_field[i] and ground_truth_field[i]]
    generated_field = [generated_field[i] for i in valid_indices]
    ground_truth_field = [ground_truth_field[i] for i in valid_indices]
    sacre_bleu = corpus_bleu(generated_field, [ground_truth_field], tokenize="13a")
    return sacre_bleu.score