code: def concat_tfrecord_files(fnames, out_fname, rm_after=True):
      with tf.gfile.Open(out_fname, "wb") as out_f:
          for fname in fnames:
              with tf.gfile.Open(fname, "rb") as in_f:
                  while True:
                      read = in_f.read(1000)
                      if not read:
                          break
                      out_f.write(read)
              if rm_after:
                  tf.gfile.Remove(fname)
  
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 1 for calling a global function with example usage: concat_tfrecord_files(fnames, out_fname, rm_after) without return types