code: def evaluate(self, policy: TorchPolicy) -> None:
      """Evaluate given policy.
  
      For most use cases, this method is expected to:
        - Write the evaluation results into the statistic logs
        - Serialize the policy if the reward improved
  
      :param policy: Policy to evaluate
      """
  
imports: import abc
  from maze.core.agent.torch_policy import TorchPolicy
label_desc: Use image node_id 1 for calling the Evaluator obj's underlying member method code with example usage: obj.evaluate(policy) without return types