Get the entire list of labels of the dictionary optionally
        including the frequency of the individual labels. Unsupervised
        models use words as labels, which is why get_labels
        will call and return get_words for this type of
        model.

def get_labels(self, include_freq=False, on_unicode_error='strict'):
        """
        Get the entire list of labels of the dictionary optionally
        including the frequency of the individual labels. Unsupervised
        models use words as labels, which is why get_labels
        will call and return get_words for this type of
        model.
        """
        a = self.f.getArgs()
        if a.model == model_name.supervised:
            pair = self.f.getLabels(on_unicode_error)
            if include_freq:
                return (pair[0], np.array(pair[1]))
            else:
                return pair[0]
        else:
            return self.get_words(include_freq)