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