code: def test_multinomialnb_classifer_multi_fit_prior(self):
      self._test_multinomialnb_classifer(3, fit_prior=True)
  
imports: import unittest
  import warnings
  import numpy
  import torch
  from sklearn.naive_bayes import BernoulliNB, GaussianNB, MultinomialNB
  import hummingbird.ml
  from hummingbird.ml._utils import tvm_installed
label_desc: Use image node_id 20 for calling the TestSklearnNBClassifier obj's underlying member method code with example usage: obj.test_multinomialnb_classifer_multi_fit_prior() without return types