class_docstr: Main Classifier object, used to classify things into similar sets.
docstr: Returns the set of all things known so far.
  
  The return value belongs to the Classifier object and should NOT
  be modified while the classifier is still in use.
code: def getThings(self):
      """Returns the set of all things known so far.
  
      The return value belongs to the Classifier object and should NOT
      be modified while the classifier is still in use.
      """
      self._process()
      return self._things
  
file_path: catboost/contrib/python/fonttools/fontTools/misc/classifyTools.py
label_desc: Use image node_id 5 for calling the Classifier obj's underlying member method code with example usage: obj.getThings() and returns: self