def get_least_salient_words(vocab, topic_word_distrib, doc_topic_distrib, doc_lengths, n=None):
    """
    Order the words from `vocab` by "saliency score" (Chuang et al. 2012) from least to most salient. Optionally only
    return the `n` least salient words.

    J. Chuang, C. Manning, J. Heer 2012: "Termite: Visualization Techniques for Assessing Textual Topic Models"
    """
    return _words_by_salience_score(vocab, topic_word_distrib, doc_topic_distrib, doc_lengths, n, least_to_most=True)
Order the words from `vocab` by "saliency score" (Chuang et al. 2012) from least to most salient. Optionally only
    return the `n` least salient words.

    J. Chuang, C. Manning, J. Heer 2012: "Termite: Visualization Techniques for Assessing Textual Topic Models"