code: def _parse_wikiheadlines(path):
    
    lang_match = re.match(r".*\.([a-z][a-z])-([a-z][a-z])$", path)
    assert lang_match is not None, "Invalid Wikiheadlines filename: %s" % path
    l1, l2 = lang_match.groups()
    with tf.io.gfile.GFile(path) as f:
      for line in f:
        s1, s2 = line.split("|||")
        yield {
            l1: s1.strip(),
            l2: s2.strip()
        }
docs: Generates examples from Wikiheadlines dataset file.