code: def test_multidim_simple07_by_steps(self):
      self.template_visualize_adding_step_by_step(
          SIMPLE_SAMPLES.SAMPLE_SIMPLE7, SIMPLE_ANSWERS.ANSWER_SIMPLE7
      )
  
imports: import unittest
  import os
  import tempfile
  import matplotlib
  from pyclustering.cluster import cluster_visualizer, cluster_visualizer_multidim
  from pyclustering.samples import answer_reader
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, SIMPLE_ANSWERS, FAMOUS_SAMPLES, FAMOUS_ANSWERS
  from pyclustering.utils import read_sample
label_desc: Use image node_id 20 for calling the visualizer_unit_tests obj's underlying member method code with example usage: obj.test_multidim_simple07_by_steps() without return types