code: def test_batch_experiences(self):
      experiences = []
      experiences.append(
          [
              dict(
                  state=1,
                  action=1,
                  reward=1,
                  next_state=i,
                  next_action=1,
                  is_state_terminal=False,
              )
              for i in range(3)
          ]
      )
      experiences.append(
          [
              dict(
                  state=1,
                  action=1,
                  reward=1,
                  next_state=1,
                  next_action=1,
                  is_state_terminal=False,
              )
          ]
      )
      four_step_transition = [
          dict(
              state=1,
              action=1,
              reward=1,
              next_state=1,
              next_action=1,
              is_state_terminal=False,
          )
      ] * 3
      four_step_transition.append(
          dict(
              state=1,
              action=1,
              reward=1,
              next_state=5,
              next_action=1,
              is_state_terminal=True,
          )
      )
      experiences.append(four_step_transition)
      batch = replay_buffer.batch_experiences(
          experiences, np, lambda x: x, 0.99
      )
      self.assertEqual(batch["state"][0], 1)
      self.assertSequenceEqual(
          list(batch["is_state_terminal"]),
          list(np.asarray([0.0, 0.0, 1.0], dtype=np.float32)),
      )
      self.assertSequenceEqual(
          list(batch["discount"]),
          list(
              np.asarray(
                  [0.99**3, 0.99**1, 0.99**4], dtype=np.float32
              )
          ),
      )
      self.assertSequenceEqual(
          list(batch["next_state"]), list(np.asarray([2, 1, 5]))
      )
  
imports: import collections
  import copy
  import os
  import tempfile
  import unittest
  from chainer import testing
  import numpy
  from chainerrl import replay_buffer
label_desc: Use image node_id 1 for calling the TestBatchExperiences obj's underlying member method code with example usage: obj.test_batch_experiences() without return types