code: def validate(self) -> None:
      # Call super's validation method.
      super().validate()
  
      if self.td_error_loss_fn not in ["huber", "mse"]:
          raise ValueError(
              "`td_error_loss_fn` must be 'huber' or 'mse'!"
          )
  
imports: import logging
  from typing import List, Optional, Type
  from ray.rllib.algorithms.algorithm import Algorithm
  from ray.rllib.algorithms.algorithm_config import AlgorithmConfig, NotProvided
  from ray.rllib.execution import synchronous_parallel_sample
  from ray.rllib.execution.train_ops import multi_gpu_train_one_step, train_one_step
  from ray.rllib.policy import Policy
  from ray.rllib.utils.annotations import override
  from ray.rllib.utils.metrics import LAST_TARGET_UPDATE_TS, NUM_AGENT_STEPS_SAMPLED, NUM_AGENT_STEPS_TRAINED, NUM_ENV_STEPS_SAMPLED, NUM_ENV_STEPS_TRAINED, NUM_TARGET_UPDATES, SAMPLE_TIMER, TARGET_NET_UPDATE_TIMER
  from ray.rllib.utils.typing import ResultDict
label_desc: Use image node_id 3 for calling the CRRConfig obj's underlying member method code with example usage: obj.validate() without return types