class_docstr: Apply a two-dimensional deformable convolution layer using offsets
code: def _initialize_params(self, in_channels):
      kh, kw = _pair(self.ksize)
      W_shape = (self.out_channels, in_channels, kh, kw)
      self.W.initialize(W_shape)
      if self.b is not None:
          self.b.initialize(self.out_channels)
  
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 2 for calling the DeformableConvolution2DSampler obj's underlying member method code with example usage: obj._initialize_params(in_channels) without return types