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* refactor(eval): integrate preprocessor and postprocessor into rollout and eval_policy functions - Updated the `rollout` and `eval_policy` functions to accept preprocessor and postprocessor parameters, enhancing the flexibility of the evaluation pipeline. - Adjusted the implementation to apply preprocessing and postprocessing steps during policy evaluation, improving the overall data handling and processing flow. * refactor(eval): remove redundant observation device conversion in rollout function - Eliminated unnecessary device conversion for the observation dictionary within the `rollout` function, streamlining the code and enhancing readability. - This change simplifies the observation handling process, aligning with the preference for clearer solutions. * debug * refactor(utils): enhance task handling in add_envs_task function - Improved the `add_envs_task` function to validate the output of `task_description` and `task` calls, ensuring they return lists of strings. - Removed the use of `else` statement for environments without language instructions, simplifying the logic and enhancing readability. - Streamlined the observation dictionary handling by ensuring consistent data types for task attributes.