code: def forward_preprocess(self, function, in_data):
      cuda.cupy.cuda.nvtx.RangePush(function.label + ".forward")
  
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 2 for calling the CUDAProfileHook obj's underlying member method code with example usage: obj.forward_preprocess(function, in_data) without return types