code: def maybe_copy_file_to_directory(source_filepath, target_directory):
    
    if not tf.gfile.Exists(target_directory):
      tf.logging.info("Creating directory %s" % target_directory)
      os.mkdir(target_directory)
    target_filepath = os.path.join(target_directory,
                                   os.path.basename(source_filepath))
    if not tf.gfile.Exists(target_filepath):
      tf.logging.info("Copying %s to %s" % (source_filepath, target_filepath))
      tf.gfile.Copy(source_filepath, target_filepath)
      statinfo = os.stat(target_filepath)
      tf.logging.info("Successfully copied %s, %s bytes." % (target_filepath,
                                                             statinfo.st_size))
    else:
      tf.logging.info("Not copying, file already found: %s" % target_filepath)
    return target_filepath
docs: Copy a file to a directory if it is not already there.
  
    Returns the target filepath.
  
    Args:
      source_filepath: a string
      target_directory: a string
  
    Returns:
      a string