code: def parse_policy_specs_from_checkpoint(
      path: str,
  ) -> Tuple[
      PartialAlgorithmConfigDict,
      Dict[str, PolicySpec],
      Dict[str, PolicyState],
  ]:
      """Read and parse policy specifications from a checkpoint file.
  
      Args:
          path: Path to a policy checkpoint.
  
      Returns:
          A tuple of: base policy config, dictionary of policy specs, and
          dictionary of policy states.
      """
      with open(path, "rb") as f:
          checkpoint_dict = pickle.load(f)
      # Policy data is contained as a serialized binary blob under their
      # ID keys.
      w = pickle.loads(checkpoint_dict["worker"])
  
      policy_config = w["policy_config"]
      assert policy_config.get("enable_connectors", False), (
          "load_policies_from_checkpoint only works for checkpoints generated by stacks "
          "with connectors enabled."
      )
      policy_states = w.get("policy_states", w["state"])
      serialized_policy_specs = w["policy_specs"]
      policy_specs = {
          id: PolicySpec.deserialize(spec)
          for id, spec in serialized_policy_specs.items()
      }
  
      return policy_config, policy_specs, policy_states
  
imports: import gymnasium
  import logging
  import numpy
  import re
  from typing import Callable, Dict, List, Mapping, Optional, Tuple, Type, Union, TYPE_CHECKING
  import tree
  import ray.cloudpickle
  from ray.rllib.models.preprocessors import ATARI_OBS_SHAPE
  from ray.rllib.policy.policy import PolicySpec
  from ray.rllib.policy.sample_batch import SampleBatch
  from ray.rllib.utils.deprecation import Deprecated
  from ray.rllib.utils.framework import try_import_tf
  from ray.rllib.utils.typing import ActionConnectorDataType, AgentConnectorDataType, AgentConnectorsOutput, PartialAlgorithmConfigDict, PolicyState, TensorStructType, TensorType
  from ray.util import log_once
  from ray.util.annotations import PublicAPI
label_desc: Use image node_id 3 for calling a global function with example usage: parse_policy_specs_from_checkpoint(path) and returns: policy_config,  policy_specs,  policy_states