code: def testVisualize1DClustersOneCanvasSampleOnly(self):
      clusters = [[[0.1], [0.2], [0.5]], [[0.1], [0.2], [0.5]]]
  
      visualizer = cluster_visualizer()
      visualizer.append_clusters(clusters, markersize=5)
      figure = visualizer.show()
      visualizer.close(figure)
  
imports: import unittest
  import matplotlib
  import matplotlib.pyplot
  import numpy
  import random
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, FCPS_SAMPLES
  from pyclustering.utils import read_sample
  from pyclustering.cluster import cluster_visualizer
  from pyclustering.cluster.dbscan import dbscan
  from pyclustering.cluster.cure import cure
label_desc: Use image node_id 3 for calling the Test obj's underlying member method code with example usage: obj.testVisualize1DClustersOneCanvasSampleOnly() without return types