code: def testBaseLossInfo(self):
      loss_info = tf_agent.LossInfo(0.0, ())
      self.assertEqual(loss_info.loss, 0.0)
      self.assertIsInstance(loss_info, tf_agent.LossInfo)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import copy
  import numpy
  import tensorflow
  from tf_agents.agents import data_converter
  from tf_agents.agents import test_util
  from tf_agents.agents import tf_agent
  from tf_agents.policies import random_tf_policy
  from tf_agents.specs import array_spec
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import time_step
  from tf_agents.trajectories import trajectory
  from tf_agents.utils import test_utils
label_desc: Use image node_id 1 for calling the LossInfoTest obj's underlying member method code with example usage: obj.testBaseLossInfo() without return types