code: def test_invalid_dtype1(self):
      x0 = chainer.Variable(
          numpy.random.uniform(-1, 1, (4, 3)).astype(numpy.int32)
      )
      x1 = chainer.Variable(
          numpy.random.uniform(-1, 1, (4, 3)).astype(numpy.int32)
      )
      with self.assertRaises(type_check.InvalidType):
          functions.mean_squared_error(x0, x1)
  
file_path: chainer/tests/chainer_tests/functions_tests/loss_tests/test_mean_squared_error.py
imports: import unittest
  import numpy
  import chainer
  from chainer import functions
  from chainer import testing
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 1 for calling the TestMeanSquaredErrorTypeCheck obj's underlying member method code with example usage: obj.test_invalid_dtype1() without return types