code: def is_real_file(dirpath, fname):
      fpath = os.path.join(dirpath, fname)
      return os.path.isfile(fpath) and not os.path.islink(fpath)
  
file_path: tensorflow/tensorflow/tools/test/upload_test_benchmarks.py
imports: import argparse
  import datetime
  import fcntl
  import json
  import os
  import shutil
  from google.cloud import datastore
label_desc: Use image node_id 1 for calling a global function with example usage: is_real_file(dirpath, fname) and returns: unknown