code: def get_urls_for_shard(urls_dir, shard_id):
      urls_file = os.path.join(urls_dir, WIKI_URLS_FILE % shard_id)
      urls_per_shard, _ = get_urls_per_shard([urls_file])
      assert len(urls_per_shard) == 1
      return urls_per_shard[shard_id]
  
imports: import datetime
  import json
  import math
  import multiprocessing
  import os
  import random
  import asyncio
  import aiohttp
  import tensorflow
  from tensor2tensor.data_generators.wikisum import html
  from tensor2tensor.data_generators.wikisum import utils
label_desc: Use image node_id 10 for calling a global function with example usage: get_urls_for_shard(urls_dir, shard_id) and returns: urls_per_shard