code: def test_cluster_ranges(self):
      np.random.seed(0)
      clf = KMeans()
      scikitplot.clustering_factory(clf)
      ax = clf.plot_elbow_curve(self.X, cluster_ranges=range(1, 10))
      ax = clf.plot_elbow_curve(self.X)
  
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 4 for calling the TestPlotElbow obj's underlying member method code with example usage: obj.test_cluster_ranges() without return types