code: def backward(self, req, out_grad, in_data, out_data, in_grad, aux):
      self.assign(in_grad[0], req[0], out_grad[0])
  
file_path: mxnet/benchmark/opperf/custom_operations/custom_operations.py
imports: import mxnet
label_desc: Use image node_id 2 for calling the CustomAddOne obj's underlying member method code with example usage: obj.backward(req, out_grad, in_data, out_data, in_grad, aux) without return types