code: def check_forward(self, x_data):
      x = chainer.Variable(x_data)
      y = self.link(x)
      self.assertEqual(y.data.dtype, numpy.float32)
      testing.assert_allclose(self.y, y.data)
  
file_path: chainer/tests/chainer_tests/links_tests/connection_tests/test_highway.py
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 3 for calling the TestHighway obj's underlying member method code with example usage: obj.check_forward(x_data) without return types