code: def backward_postprocess(self, function, in_data, out_grad):
      cuda.cupy.cuda.nvtx.RangePop()
  
file_path: chainer/chainer/function_hooks/cuda_profile.py
imports: from chainer.backends import cuda
  from chainer import function_hook
label_desc: Use image node_id 5 for calling the CUDAProfileHook obj's underlying member method code with example usage: obj.backward_postprocess(function, in_data, out_grad) without return types