code: def _compile_x(self, ndim, ds):
      # 2D: int x_0 = i / (d_1) % d_0;
      #     int x_1 = i % d_1;
      def aux(x, ds):
          head = ds[0]
          tail = ds[1:]
          if tail:
              return "int {} = i / ({}) % {};".format(
                  x, mulexp(tail), head
              )
          else:
              return "int {} = i % {};".format(x, head)
  
      xs = vars("x", ndim)
      x_decls = map_(aux, xs, succ_sublists(ds))
      return x_decls, xs
  
imports: import functools
  import six
  from chainer.backends import cuda
label_desc: Use image node_id 4 for calling the Col2imNDKernel obj's underlying member method code with example usage: obj._compile_x(ndim, ds) and returns: x_decls,  xs, str, str