code: def check_forward(self, x, offset, W, b, stride, pad):
      with chainer.using_config("use_cudnn", self.use_cudnn):
          x = chainer.Variable(x)
          offset = chainer.Variable(offset)
          out = deformable_convolution_2d_sampler(
              x, offset, W, b, stride, pad
          ).data
          expeceted = convolution_2d(x, W, b, stride, pad).data
      testing.assert_allclose(out, expeceted)
  
imports: import unittest
  import numpy
  import chainer
  from chainer import cuda
  from chainer.functions import convolution_2d
  from chainer.functions import deformable_convolution_2d_sampler
  from chainer import utils
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 2 for calling the TestDeformableConvolution2DSamplerFunctionZeroOffset obj's underlying member method code with example usage: obj.check_forward(x, offset, W, b, stride, pad) without return types