code: def _compile_main(self, ndim, ds, ks, ss, ps, dilate, kxs, out_xs):
      # 2D: int in_0 = kx_0 * di_0 + out_x_0 * s_0 - p_0;
      #     int in_1 = kx_1 * di_1 + out_x_1 * s_1 - p_1;
      #     if (0 <= in_0 && in_0 < d_0 && 0 <= in_1 && in_1 < d_1) {
      #       int idx_0 = in_0 + d_0 * c0;
      #       int idx_1 = in_1 + d_1 * idx_0;
      #       col = img[idx_1];
      #     } else {
      #       col = (T)0;
      #     }
      w = Writer()
  
      ins = vars("in", ndim)
      for _in, kx, out_x, s, p, di in six.moves.zip(
          ins, kxs, out_xs, ss, ps, dilate
      ):
          target = "int {} = {} * {} + {} * {} - {};"
          w.write(target.format(_in, kx, di, out_x, s, p))
  
      def rel_aux(_in, d):
          return "0 <= {} && {} < {}".format(_in, _in, d)
  
      w.write(
          "if ({}) {{".format(andexp(map_(rel_aux, ins, ds))),
          indent="inc",
      )
  
      idxs = vars("idx", ndim)
      idx0s = ["c0"] + idxs[:-1]
      for idx, _in, d, idx0 in six.moves.zip(idxs, ins, ds, idx0s):
          w.write("int {} = {} + {} * {};".format(idx, _in, d, idx0))
  
      w.write("col = img[{}];".format(idxs[-1]))
      w.write("} else {", indent="decinc")
      w.write("col = (T)0;")
      w.write("}", indent="dec")
  
      return [w.get()]
  
imports: import functools
  import six
  from chainer.backends import cuda
label_desc: Use image node_id 6 for calling the Im2colNDKernel obj's underlying member method code with example usage: obj._compile_main(ndim, ds, ks, ss, ps, dilate, kxs, out_xs) and returns: list, str