Annotate a squence of words with entity tags.

    Args:
      sent: sequence of strings/words.

def annotate(self, sent):
    """Annotate a squence of words with entity tags.

    Args:
      sent: sequence of strings/words.
    """
    preds = []
    words = []
    for word, fv in self.sent2examples(sent):
      probs = self.predictor(fv)
      tags = probs.argsort()
      tag = self.ID_TAG[tags[-1]]

      words.append(word)
      preds.append(tag)

    # fix_chunks(preds)
    annotations = zip(words, preds)
    return annotations