code: def click_train(self):
      self.__recognizer.train()
  
imports: from pyclustering.nnet.som import som, type_conn
  from pyclustering.samples.definitions import IMAGE_DIGIT_SAMPLES
  from pyclustering.utils import read_image, rgb2gray
  from tkinter import *
  from tkinter import messagebox
  import math
  import pickle
  import os
  import random
label_desc: Use image node_id 3 for calling the digit_application obj's underlying member method code with example usage: obj.click_train() without return types