class_docstr: Silhouette Visualizer Tests
class_docstr_tok: ["Silhouette","Visualizer","Tests"]
docstr: Ensure negative silhouette scores are correctly displayed by the visualizer.
docstr_tok: ["Ensure","negative","silhouette","scores","are","correctly","displayed","by","the","visualizer","."]
code: def test_negative_silhouette_score(self):
      """
      Ensure negative silhouette scores are correctly displayed by the visualizer.
      """
      raise NotImplementedError(
          "no negative silhouette example available"
      )
  
imports: import sys
  import pytest
  import matplotlib.pyplot
  import numpy
  from sklearn.datasets import make_blobs
  from sklearn.cluster import KMeans, MiniBatchKMeans
  from sklearn.cluster import SpectralClustering, AgglomerativeClustering
  from unittest import mock
  from tests.base import VisualTestCase
  from yellowbrick.cluster.silhouette import SilhouetteVisualizer, silhouette_visualizer
label_desc: Use image node_id 3 for calling the TestSilhouetteVisualizer obj's underlying member method code with example usage: obj.test_negative_silhouette_score() without return types