code: def read_lines_from_file(cls_name, filename):
    
    with tf.io.gfile.GFile(filename, "rb") as f:
      lines = [tf.compat.as_text(line)[:-1] for line in f]
    header_line = "%s%s" % (_HEADER_PREFIX, cls_name)
    if lines[0] != header_line:
      raise ValueError("File {fname} does not seem to have been created from "
                       "{name}.save_to_file.".format(
                           fname=filename, name=cls_name))
    metadata_dict = json.loads(lines[1][len(_METADATA_PREFIX):])
    return lines[2:], metadata_dict
docs: Read lines from file, parsing out header and metadata.