class_docstr: unigram/bigram LM, add-k smoothing
docstr: text must be prefix of a word
docstr_tok: ["text","must","be","prefix","of","a","word"]
code: def getNextWords(self, text):
      "text must be prefix of a word"
      return self.tree.getNextWords(text)
  
file_path: calamari/calamari_ocr/thirdparty/ctcwordbeamsearch/LanguageModel.py
imports: from __future__ import division
  from __future__ import print_function
  import re
  from .PrefixTree import PrefixTree
label_desc: Use image node_id 2 for calling the LanguageModel obj's underlying member method code with example usage: obj.getNextWords(text) and returns: self