code: def save_contamination_ngrams(self, filename):
      with open(filename, "wb") as fp:
          pickle.dump(filename, fp)
  
imports: import re
  import string
  import timeit
  import pickle
  import traceback
  from pprint import pprint
label_desc: Use image node_id 2 for calling the Janitor obj's underlying member method code with example usage: obj.save_contamination_ngrams(filename) without return types