class_docstr: Apply a two-dimensional deformable convolution layer using offsets
code: def forward(self, x, offset):
      if self.W.array is None:
          self._initialize_params(x.shape[1])
      return deformable_convolution_2d_sampler(
          x, offset, self.W, self.b, self.stride, self.pad
      )
  
file_path: chainer/chainer/links/connection/deformable_convolution_2d.py
imports: from chainer.functions import deformable_convolution_2d_sampler
  from chainer import initializers
  from chainer.initializers import constant
  from chainer import link
  from chainer.links.connection.convolution_2d import Convolution2D
  from chainer import variable
label_desc: Use image node_id 3 for calling the DeformableConvolution2DSampler obj's underlying member method code with example usage: obj.forward(x, offset) and returns: deformable_convolution_2d_sampler