code: def _generate_single_timesteps(self):
      return SampleBatch(
          {
              SampleBatch.T: [0],
              SampleBatch.ACTIONS: [np.random.choice([0, 1])],
              SampleBatch.REWARDS: [np.random.rand()],
              SampleBatch.OBS: [np.random.random((4,))],
              SampleBatch.NEXT_OBS: [np.random.random((4,))],
              SampleBatch.TERMINATEDS: [True],
              SampleBatch.TRUNCATEDS: [False],
              SampleBatch.EPS_ID: [self.batch_id],
              SampleBatch.AGENT_INDEX: [0],
          }
      )
  
file_path: ray/rllib/utils/replay_buffers/tests/test_multi_agent_mixin_replay_buffer.py
imports: import numpy
  import unittest
  from ray.rllib.utils.replay_buffers.multi_agent_mixin_replay_buffer import MultiAgentMixInReplayBuffer
  from ray.rllib.policy.sample_batch import SampleBatch, DEFAULT_POLICY_ID, MultiAgentBatch
label_desc: Use image node_id 2 for calling the TestMixInMultiAgentReplayBuffer obj's underlying member method code with example usage: obj._generate_single_timesteps() and returns: SampleBatch