code: def _compile_c0(self):
      # 2D: int c0  = i / (d_0 * d_1);
      return [
          "int c0  = i / ({});".format(conv_nd_kernel.mulexp(self.ds))
      ]
  
imports: from six import moves
  from chainer.backends import cuda
  from chainer.utils import conv_nd_kernel
label_desc: Use image node_id 11 for calling the PoolingNDKernelBackward obj's underlying member method code with example usage: obj._compile_c0() and returns: list