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

def print_ldamodel_doc_topics(doc_topic_distrib, doc_labels, n_top=3, val_labels=DEFAULT_TOPIC_NAME_FMT):
    """Print `n_top` values from a LDA model's document-topic distributions."""
    print_ldamodel_distribution(doc_topic_distrib, row_labels=doc_labels, val_labels=val_labels,
                                top_n=n_top)