code: def setUp(self):
      super(PyDriverTest, self).setUp()
      f0 = np.array(0.0, dtype=np.float32)
      f1 = np.array(1.0, dtype=np.float32)
      # Order of args for trajectory methods:
      # (observation, action, policy_info, reward, discount)
      self._trajectories = [
          trajectory.first(0, 1, 2, f1, f1),
          trajectory.last(1, 2, 4, f1, f0),
          trajectory.boundary(3, 1, 2, f0, f1),
          trajectory.first(0, 1, 2, f1, f1),
          trajectory.last(1, 2, 4, f1, f0),
          trajectory.boundary(3, 1, 2, f0, f1),
          trajectory.first(0, 1, 2, f1, f1),
      ]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tf_agents.drivers import py_driver
  from tf_agents.drivers import test_utils
  from tf_agents.environments import batched_py_environment
  from tf_agents.trajectories import trajectory
label_desc: Use image node_id 1 for calling the PyDriverTest obj's underlying member method code with example usage: obj.setUp() without return types