code: def tearDown(self):
      plt.close("all")
  
imports: from __future__ import absolute_import
  import unittest
  import scikitplot
  import warnings
  import numpy
  from sklearn.datasets import load_iris
  from sklearn.cluster import KMeans
  import matplotlib.pyplot
label_desc: Use image node_id 2 for calling the TestPlotElbow obj's underlying member method code with example usage: obj.tearDown() without return types