def _find_human_readable_labels(synsets, synset_to_human):
    """Build a list of human-readable labels.

  Args:
    synsets: list of strings; each string is a unique WordNet ID.
    synset_to_human: dict of synset to human labels, e.g.,
      'n02119022' --> 'red fox, Vulpes vulpes'

  Returns:
    List of human-readable strings corresponding to each synset.
  """
    humans = []
    for s in synsets:
        assert s in synset_to_human, 'Failed to find: %s' % s
        humans.append(synset_to_human[s])
    return humans
