class_docstr: A class that provides distributed, random access to a Dataset.
  
  See: ``Dataset.to_random_access_dataset()``.
class_docstr_tok: ["A","class","that","provides","distributed",",","random","access","to","a","Dataset",".","See",":","``","Dataset.to_random_access_dataset","(",")","``","."]
code: def _worker_for(self, block_index: int):
      return random.choice(self._block_to_workers_map[block_index])
  
imports: import bisect
  import logging
  import random
  import time
  from collections import defaultdict
  from typing import TYPE_CHECKING, Any, List, Optional
  import numpy
  import ray
  from ray.data._internal.remote_fn import cached_remote_fn
  from ray.data.block import BlockAccessor
  from ray.data.context import DataContext
  from ray.types import ObjectRef
  from ray.util.annotations import PublicAPI
label_desc: Use image node_id 6 for calling the RandomAccessDataset obj's underlying member method code with example usage: obj._worker_for(block_index) and returns: random