code: def _operation(self, ndim, ds, outs, ks, ss, ps, dilate):
      c0 = self._compile_c0(ds)
      x, xs = self._compile_x(ndim, ds)
      loop_main = self._compile_loop(ndim, outs, ks, ss, ps, xs, dilate)
      before, main, after = self._compile_procedure(outs, xs)
      return "\n".join(
          c0 + x + before + loop_main(main, ndim, ks, ss) + after
      )
  
imports: import functools
  import six
  from chainer.backends import cuda
label_desc: Use image node_id 7 for calling the Col2imNDKernel obj's underlying member method code with example usage: obj._operation(ndim, ds, outs, ks, ss, ps, dilate) and returns: str