mirror of https://github.com/alibaba/MNN.git
42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
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//
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// ConcatGrad.cpp
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// MNN
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//
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// Created by MNN on 2019/12/11.
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// Copyright © 2018, Alibaba Group Holding Limited
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//
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#include "OpGrad.hpp"
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#include "core/Macro.h"
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using namespace std;
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using namespace MNN;
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using namespace MNN::Express;
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class ConcatGrad : public OpGrad {
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public:
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virtual std::vector<Express::VARP> onGrad(Express::EXPRP expr, const std::vector<Express::VARP>& output,
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const std::vector<Express::VARP>& backwardOutput) override {
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std::vector<VARP> res(expr->inputs().size());
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if (!expr->requireInfo()) {
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return res;
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}
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auto axis = expr->get()->main_as_Axis()->axis();
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if (axis < 0) {
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axis = expr->outputInfo(0)->dim.size() + axis;
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}
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std::vector<int> points(res.size());
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for (int i = 0; i < res.size(); ++i) {
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auto input = expr->inputs()[i];
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points[i] = input->getInfo()->dim[axis];
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}
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res = _Split(backwardOutput[0], points, axis);
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return res;
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}
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};
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static const auto gRegister = []() {
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static ConcatGrad _c;
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OpGrad::insert((int)OpType_Concat, &_c);
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return true;
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}();
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