code: def word_ngrams(s, n):
      """Splits a string into ngram words"""
      tokens = s.split()  # not a generator :(
      ngram_seqs = form_ngrams(iter(tokens), n)
      return (" ".join(ngram) for ngram in ngram_seqs)
  
imports: import re
  import string
  import timeit
  import pickle
  import traceback
  from pprint import pprint
label_desc: Use image node_id 2 for calling a global function with example usage: word_ngrams(s, n) and returns: unknown