code: def match_dtype(self, actual, expected, msg=None):
      if msg:
          msg = "Dtype match failed for: {}. Expected: {} Actual: {}.".format(
              msg, expected.dtype, actual.dtype
          )
      self.assertEqual(actual.dtype, expected.dtype, msg=msg)
  
file_path: trax/trax/tf_numpy/numpy_impl/tests/logic_test.py
imports: import numpy
  import tensorflow.compat.v2
  from trax.tf_numpy.numpy_impl import array_ops
  from trax.tf_numpy.numpy_impl import arrays
  from trax.tf_numpy.numpy_impl import math_ops
label_desc: Use image node_id 4 for calling the LogicTest obj's underlying member method code with example usage: obj.match_dtype(actual, expected, msg) without return types