class_docstr: String with various indexes.
docstr: Returns the number of tokens in the vocabulary for this document.
code: def num_words(self):
      """Returns the number of tokens in the vocabulary for this document."""
      return len(self.inverse_vocab)
  
imports: from functools import partial
  import itertools
  import json
  import re
  import numpy
  import scipy
  import sklearn
  from sklearn.utils import check_random_state
  from .None import explanation
  from .None import lime_base
label_desc: Use image node_id 3 for calling the IndexedCharacters obj's underlying member method code with example usage: obj.num_words() and returns: len