code: def test_check_and_get_mask(self):
      test_scores = tf.ones([2, 3])
      positive_mask = np.eye(N=2, M=3, dtype=bool)
  
      # create default masks
      r_scores, r_pos_mask = mi._check_and_get_mask(test_scores)
      self.assertEqual(r_scores.shape, [2, 3])
      self.assertAllEqual(self.evaluate(r_pos_mask), positive_mask)
  
file_path: probability/tensorflow_probability/python/vi/mutual_information_test.py
imports: import numpy
  import scipy
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import mvn_diag
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.vi import mutual_information
label_desc: Use image node_id 2 for calling the MutualInformationTest obj's underlying member method code with example usage: obj.test_check_and_get_mask() without return types