code: def get_namespace(tag):
      """Get the namespace of tag.
  
      Parameters
      ----------
      tag : str
          Namespace or tag.
  
      Returns
      -------
      str
          Matched namespace or tag.
  
      """
      m = re.match("^{(.*?)}", tag)
      namespace = m.group(1) if m else ""
      if not namespace.startswith(
          "http://www.mediawiki.org/xml/export-"
      ):
          raise ValueError(
              "%s not recognized as MediaWiki dump namespace"
              % namespace
          )
      return namespace
  
imports: import bz2
  import logging
  import multiprocessing
  import re
  import signal
  from pickle import PicklingError
  from xml.etree.ElementTree import iterparse
  from gensim import utils
  from gensim.corpora.dictionary import Dictionary
  from gensim.corpora.textcorpus import TextCorpus
label_desc: Use image node_id 8 for calling a global function with example usage: get_namespace(tag) and returns: namespace