class_docstr: Test Contact Fingerprints and Voxelizers.
code: def test_contact_voxels_shape(self):
      box_width = 48
      voxel_width = 2
      voxels_per_edge = box_width / voxel_width
      size = 8
      voxelizer = dc.feat.ContactCircularVoxelizer(
          box_width=box_width, voxel_width=voxel_width, size=size
      )
      features = voxelizer.featurize(self.complex_files)
      assert features.shape == (
          1,
          voxels_per_edge,
          voxels_per_edge,
          voxels_per_edge,
          size,
      )
  
file_path: deepchem/deepchem/feat/tests/test_contact_fingerprints.py
imports: import os
  import unittest
  import deepchem
label_desc: Use image node_id 3 for calling the TestContactFeaturizers obj's underlying member method code with example usage: obj.test_contact_voxels_shape() without return types