code: def check_forward(self, x_data):
      x = chainer.Variable(x_data)
      y = self.link(x)
      self.assertEqual(y.data.dtype, self.x_dtype)
      testing.assert_allclose(
          self.y, y.data, **self.check_forward_options
      )
  
imports: import os
  import tempfile
  import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import gradient_check
  from chainer import links
  from chainer.serializers import npz
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import condition
  from chainer.utils import type_check
label_desc: Use image node_id 2 for calling the TestLinear obj's underlying member method code with example usage: obj.check_forward(x_data) without return types