docstr: Test that the ViewRequirementAgentConnector can handle shift by one correctly and
  can ignore future referencing view_requirements to respect causality
docstr_tok: ["Test","that","the","ViewRequirementAgentConnector","can","handle","shift","by","one","correctly","and","can","ignore","future","referencing","view_requirements","to","respect","causality"]
code: def test_vr_connector_shift_by_one(self):
      """Test that the ViewRequirementAgentConnector can handle shift by one correctly and
      can ignore future referencing view_requirements to respect causality
      """
      view_rq_dict = {
          "state": ViewRequirement("obs"),
          "next_state": ViewRequirement(
              "obs", shift=1, used_for_compute_actions=False
          ),
          "prev_state": ViewRequirement("obs", shift=-1),
      }
  
      obs_arrs = np.arange(10)[:, None] + 1
      config = PPOConfig().to_dict()
      ctx = ConnectorContext(
          view_requirements=view_rq_dict,
          config=config,
          is_policy_recurrent=True,
      )
      c = ViewRequirementAgentConnector(ctx)
  
      # keep a running list of observations
      obs_list = []
      for t, obs in enumerate(obs_arrs):
          # t=0 is the next state of t=-1
          data = AgentConnectorDataType(
              0, 1, {SampleBatch.NEXT_OBS: obs}
          )
          processed = c(
              [data]
          )  # env.reset() for t == -1 else env.step()
          sample_batch = processed[0].data.sample_batch
          # add cur obs to the list
          obs_list.append(obs)
  
          if t == 0:
              check(sample_batch["prev_state"], sample_batch["state"])
          else:
              # prev state should be equal to the prev time step obs
              check(sample_batch["prev_state"], obs_list[-2][None])
  
imports: import gymnasium
  from gymnasium.spaces import Box
  import numpy
  import tree
  import unittest
  from ray.rllib.algorithms.ppo.ppo import PPOConfig
  from ray.rllib.connectors.agent.clip_reward import ClipRewardAgentConnector
  from ray.rllib.connectors.agent.lambdas import FlattenDataAgentConnector
  from ray.rllib.connectors.agent.obs_preproc import ObsPreprocessorConnector
  from ray.rllib.connectors.agent.pipeline import AgentConnectorPipeline
  from ray.rllib.connectors.agent.state_buffer import StateBufferConnector
  from ray.rllib.connectors.agent.view_requirement import ViewRequirementAgentConnector
  from ray.rllib.connectors.connector import ConnectorContext
  from ray.rllib.connectors.registry import get_connector
  from ray.rllib.policy.view_requirement import ViewRequirement
  from ray.rllib.policy.sample_batch import SampleBatch
  from ray.rllib.utils.test_utils import check
  from ray.rllib.utils.typing import ActionConnectorDataType, AgentConnectorDataType, AgentConnectorsOutput
  from ray.rllib.connectors.agent.mean_std_filter import MeanStdObservationFilterAgentConnector
label_desc: Use image node_id 2 for calling the TestViewRequirementAgentConnector obj's underlying member method code with example usage: obj.test_vr_connector_shift_by_one() without return types