code: def category_features(self, categories):
      cats = " ".join(categories.split("_"))
      return self.extract_nouns(self._pos(cats))
  
imports: from sematch.utility import FileIO
  from nltk.stem import WordNetLemmatizer
  from nltk.corpus import wordnet
  import nltk
  from collections import Counter
  import itertools
  import string
  import re
label_desc: Use image node_id 10 for calling the FeatureExtractor obj's underlying member method code with example usage: obj.category_features(categories) and returns: self