Print `n_top` values from a LDA model's topic-word distributions.

def print_ldamodel_topic_words(topic_word_distrib, vocab, n_top=10, row_labels=DEFAULT_TOPIC_NAME_FMT):
    """Print `n_top` values from a LDA model's topic-word distributions."""
    print_ldamodel_distribution(topic_word_distrib, row_labels=row_labels, val_labels=vocab,
                                top_n=n_top)