code: def build_tokenizer(self):
      tokenize = super().build_tokenizer()
      return lambda doc: list(number_normalizer(tokenize(doc)))
  
file_path: scikit-learn/examples/bicluster/plot_bicluster_newsgroups.py
imports: import operator
  from collections import defaultdict
  from time import time
  import numpy
  from sklearn.cluster import MiniBatchKMeans, SpectralCoclustering
  from sklearn.datasets import fetch_20newsgroups
  from sklearn.feature_extraction.text import TfidfVectorizer
  from sklearn.metrics.cluster import v_measure_score
label_desc: Use image node_id 1 for calling the NumberNormalizingVectorizer obj's underlying member method code with example usage: obj.build_tokenizer() and returns: function