code: def transform(
      self, ac_data: AgentConnectorDataType
  ) -> AgentConnectorDataType:
      d = ac_data.data
      assert (
          type(d) == dict
      ), "Single agent data must be of type Dict[str, TensorStructType]"
  
      env_id = ac_data.env_id
      agent_id = ac_data.agent_id
      assert (
          env_id is not None and agent_id is not None
      ), f"StateBufferConnector requires env_id(f{env_id}) and agent_id(f{agent_id})"
  
      action, states, fetches = self._states[env_id][agent_id]
  
      if action is not None:
          d[SampleBatch.ACTIONS] = action  # Last action
      else:
          # Default zero action.
          d[SampleBatch.ACTIONS] = tree.map_structure(
              lambda s: np.zeros_like(s.sample(), s.dtype)
              if hasattr(s, "dtype")
              else np.zeros_like(s.sample()),
              self._action_space_struct,
          )
  
      if states is None:
          states = self._initial_states
      if self._enable_new_api_stack:
          if states:
              d[STATE_OUT] = states
      else:
          for i, v in enumerate(states):
              d["state_out_{}".format(i)] = v
  
      # Also add extra fetches if available.
      if fetches:
          d.update(fetches)
  
      return ac_data
  
imports: from collections import defaultdict
  import logging
  import pickle
  from typing import Any
  import numpy
  from ray.rllib.utils.annotations import override
  import tree
  from ray.rllib.connectors.connector import AgentConnector, Connector, ConnectorContext
  from ray import cloudpickle
  from ray.rllib.connectors.registry import register_connector
  from ray.rllib.policy.sample_batch import SampleBatch
  from ray.rllib.core.models.base import STATE_OUT
  from ray.rllib.utils.spaces.space_utils import get_base_struct_from_space
  from ray.rllib.utils.typing import ActionConnectorDataType, AgentConnectorDataType
  from ray.util.annotations import PublicAPI
label_desc: Use image node_id 5 for calling the StateBufferConnector obj's underlying member method code with example usage: obj.transform(ac_data) and returns: ac_data