docstr: Test C_npmi topic coherence algorithm on given topics
docstr_tok: ["Test","C_npmi","topic","coherence","algorithm","on","given","topics"]
code: def testCnpmi(self):
      """Test C_npmi topic coherence algorithm on given topics"""
      self.check_coherence_measure("c_npmi")
  
imports: import logging
  import unittest
  import multiprocessing
  from functools import partial
  import numpy
  from gensim.matutils import argsort
  from gensim.models.coherencemodel import CoherenceModel, BOOLEAN_DOCUMENT_BASED
  from gensim.models.ldamodel import LdaModel
  from gensim.test.utils import get_tmpfile, common_texts, common_dictionary, common_corpus
label_desc: Use image node_id 6 for calling the TestCoherenceModel obj's underlying member method code with example usage: obj.testCnpmi() without return types