code: def testStructSubclassClone(self):
      class Subclass(schema.Struct):
          pass
  
      s = Subclass(
          ("a", schema.Scalar()),
      )
      clone = s.clone()
      self.assertIsInstance(clone, Subclass)
      self.assertEqual(s, clone)
      self.assertIsNot(clone, s)
  
imports: from caffe2.python import core, schema
  import numpy
  import unittest
  import pickle
  import random
label_desc: Use image node_id 4 for calling the TestDB obj's underlying member method code with example usage: obj.testStructSubclassClone() without return types