code: def _parse_czeng(*paths, **kwargs):
      """Generates examples from CzEng v1.6, with optional filtering for v1.7."""
      filter_path = kwargs.get("filter_path", None)
      if filter_path:
          re_block = re.compile(r"^[^-]+-b(\d+)-\d\d[tde]")
          with epath.Path(filter_path).open() as f:
              bad_blocks = set(
                  re.search(r"qw{([\s\d]*)}", f.read())
                  .groups()[0]
                  .split()  # pytype: disable=attribute-error
              )
          logging.info(
              "Loaded %d bad blocks to filter from CzEng v1.6 to make v1.7.",
              len(bad_blocks),
          )
  
      for path in paths:
          for gz_path in glob_str(path):
              with epath.Path(gz_path).open("rb") as g, gzip.GzipFile(
                  fileobj=g
              ) as f:
                  filename = os.path.basename(gz_path)
                  for line_id, line in enumerate(f):
                      line = line.decode("utf-8")  # required for py3
                      if not line.strip():
                          continue
                      id_, unused_score, cs, en = line.split("\t")
                      if filter_path:
                          block_match = re.match(re_block, id_)
                          if (
                              block_match
                              and block_match.groups()[0] in bad_blocks
                          ):
                              continue
                      sub_key = "{}/{}".format(filename, line_id)
                      yield sub_key, {
                          "cs": cs.strip(),
                          "en": en.strip(),
                      }
  
imports: import codecs
  import functools
  import gzip
  import itertools
  import os
  import re
  from typing import List
  from xml.etree import ElementTree
  from absl import logging
  from etils import epath
  from tensorflow_datasets.core.utils import tree_utils
  import tensorflow_datasets.public_api
label_desc: Use image node_id 8 for calling a global function with example usage: _parse_czeng() without return types