code: def testEmitLogProbability(self):
      policy = TfEmitLogProbsPolicy()
      observation = tf.constant(2.0, shape=(2, 2), dtype=tf.float32)
      time_step = ts.restart(observation)
  
      step = self.evaluate(policy.action(time_step))
      self.assertAlmostEqual(step.info.log_probability, np.log(0.2))
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from typing import cast
  from absl.testing import parameterized
  import numpy
  import tensorflow
  import tensorflow_probability
  from tf_agents.policies import tf_policy
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import policy_step
  from tf_agents.trajectories import time_step
  from tf_agents.utils import common
  from tf_agents.utils import test_utils
label_desc: Use image node_id 9 for calling the TfPolicyTest obj's underlying member method code with example usage: obj.testEmitLogProbability() without return types