code: def assertDtype(self, actual, expected):
      self._reset_dtype()
  
      msg = f"{actual} instead of {expected}"
      self.assertTrue(actual == expected, msg)
  
imports: import random
  import numpy
  import pytest
  import scipy
  import geomstats.backend
  from geomstats.test.test_case import TestCase
  from geomstats.test.vectorization import generate_vectorization_data
label_desc: Use image node_id 2 for calling the DtypeTestCase obj's underlying member method code with example usage: obj.assertDtype(actual, expected) without return types