code: def _one_hot(self, data, space_struct):
      if space_struct is None:
          raise ValueError(
              f"Cannot `one_hot` data in `{type(self).__name__}` if a "
              "gym.Space was NOT provided during construction!"
          )
  
      def _convert(dat_, space):
          if isinstance(space, gym.spaces.Discrete):
              return one_hot(dat_, depth=space.n)
          elif isinstance(space, gym.spaces.MultiDiscrete):
              return one_hot_multidiscrete(dat_, depths=space.nvec)
          return dat_
  
      if isinstance(data, list):
          data = [
              tree.map_structure(_convert, dslice, space_struct)
              for dslice in data
          ]
      else:
          data = tree.map_structure(_convert, data, space_struct)
      return data
  
imports: import logging
  from typing import List, Optional, Type, Union
  import gymnasium
  import numpy
  import tree
  from ray.rllib.env.env_context import EnvContext
  from ray.rllib.env.multi_agent_env import MultiAgentEnv
  from ray.rllib.env.wrappers.multi_agent_env_compatibility import MultiAgentEnvCompatibility
  from ray.rllib.utils.error import ERR_MSG_INVALID_ENV_DESCRIPTOR, ERR_MSG_OLD_GYM_API, EnvError
  from ray.rllib.utils.gym import check_old_gym_env
  from ray.rllib.utils.numpy import one_hot, one_hot_multidiscrete
  from ray.rllib.utils.spaces.space_utils import batch, get_dummy_batch_for_space, get_base_struct_from_space
  from ray.util import log_once
  from ray.util.annotations import PublicAPI
label_desc: Use image node_id 19 for calling the BufferWithInfiniteLookback obj's underlying member method code with example usage: obj._one_hot(data, space_struct) and returns: data, dat_, one_hot, one_hot_multidiscrete