Can not get Tensor when I reuse another Op as backward function

[Yancey1989]

I want to use Split Op as the backward function of Concat Op, so I define a Grad Class inherihance Net Op, such as:

class ConcatOpGrad : public NetOp {
 public:
  ConcatOpGrad(const std::string &type, const framework::VariableNameMap &inputs,
              const framework::VariableNameMap &outputs,
              const framework::AttributeMap &attrs)
      : NetOp(type, inputs, outputs, attrs) {
        
        AppendOp(framework::OpRegistry::CreateOp("split", ...));
        CompleteAddOp(false);
  }
};

And I need to calculate the attribute sections for Split Op, it dependence on the input tensor dims. The problem is I can not get tensor in the constructor function.Because we can only get tensor from scope, but we can only get some variable names in the constructor fucntion.

[shanyi15]

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