code: def classify(instance):
      """
      Convenience method using a global identifier instance with the default
      model included in langid.py. Identifies the language that a string is
      written in.
  
      @param instance a text string. Unicode strings will automatically be utf8-encoded
      @returns a tuple of the most likely language and the confidence score
      """
      global identifier
      if identifier is None:
          load_model()
  
      return identifier.classify(instance)
  
imports: from __future__ import print_function
  import base64
  import bz2
  import json
  import optparse
  import sys
  import logging
  import numpy
  from wsgiref.simple_server import make_server
  from wsgiref.util import shift_path_info
  from collections import defaultdict
label_desc: Use image node_id 2 for calling a global function with example usage: classify(instance) and returns: identifier