code: def testReduce(self):
      for enum in dtypes._TYPE_TO_STRING:
          dtype = dtypes.DType(enum)
          ctor, args = dtype.__reduce__()
          self.assertEqual(ctor, dtypes.as_dtype)
          self.assertEqual(args, (dtype.name,))
          reconstructed = ctor(*args)
          self.assertEqual(reconstructed, dtype)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import _dtypes
  from tensorflow.core.framework import types_pb2
  from tensorflow.core.function import trace_type
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 20 for calling the TypesTest obj's underlying member method code with example usage: obj.testReduce() without return types