code: def testMaskedArgmax(self, input_tensor, mask, expected):
      actual = policy_utilities.masked_argmax(
          tf.constant(input_tensor, dtype=tf.float32), tf.constant(mask)
      )
      self.assertAllEqual(actual, expected)
  
file_path: agents/tf_agents/bandits/policies/policy_utilities_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import tensorflow
  from tf_agents.policies import utils
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import policy_step
  from tf_agents.utils import test_utils
label_desc: Use image node_id 1 for calling the PolicyUtilitiesTest obj's underlying member method code with example usage: obj.testMaskedArgmax(input_tensor, mask, expected) without return types