code: def cluster_actors(self):
      return self.__cluster_actors
  
file_path: dipy/dipy/viz/horizon/visualizer/cluster.py
imports: import numpy
  from dipy.segment.clustering import qbx_and_merge
  from dipy.tracking.streamline import length
  from dipy.utils.optpkg import optional_package
label_desc: Use image node_id 8 for calling the ClustersVisualizer obj's underlying member method code with example usage: obj.cluster_actors() and returns: self