code: def tearDown(self):
      plt.close("all")
  
imports: from __future__ import absolute_import
  import unittest
  from sklearn.datasets import load_iris
  from sklearn.linear_model import LogisticRegression
  from sklearn.ensemble import RandomForestClassifier
  import numpy
  import matplotlib.pyplot
  from scikitplot.estimators import plot_feature_importances
  from scikitplot.estimators import plot_learning_curve
label_desc: Use image node_id 2 for calling the TestFeatureImportances obj's underlying member method code with example usage: obj.tearDown() without return types