code: def after(self, xs):
      return "gx = val;"
  
file_path: chainer/chainer/functions/pooling/average_pooling_nd_kernel.py
imports: from chainer.functions.pooling import pooling_nd_kernel
label_desc: Use image node_id 4 for calling the AveragePoolingNDKernelBackward obj's underlying member method code with example usage: obj.after(xs) and returns: str