class_docstr: DatasetBuilder for rlu_rwrl dataset.
class_docstr_tok: ["DatasetBuilder","for","rlu_rwrl","dataset","."]
code: def get_file_prefix(self):
      domain = self.builder_config.domain
      task = self.builder_config.task
      combined_challenge = self.builder_config.combined_challenge
      dataset_size = self.builder_config.dataset_size
      return (
          f"{self._INPUT_FILE_PREFIX}/"
          f"combined_challenge_{str(combined_challenge).lower()}/"
          f"{domain}/{task}/{dataset_size}/episodes.tfrecord"
      )
  
imports: from __future__ import annotations
  import collections
  import dataclasses
  import functools
  import os
  from typing import Any, Dict, Generator, Optional, Sequence, Text, Tuple, Union
  import numpy
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
  import tensorflow_datasets.public_api
  from tensorflow_datasets.rl_unplugged import rlu_common
label_desc: Use image node_id 4 for calling the RluRwrl obj's underlying member method code with example usage: obj.get_file_prefix() and returns: self, str, str, str, domain, str, task, str, dataset_size, str