wehub-resource-sync
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
//
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// GatherGrad.cpp
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// MNN
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//
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// Created by MNN on 2021/02/20.
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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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using namespace std;
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namespace MNN {
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using namespace MNN::Express;
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class GatherGrad : public OpGrad {
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public:
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virtual std::vector<Express::VARP> onGrad(Express::EXPRP expr,
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const std::vector<Express::VARP>& backwardOutput) override {
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auto op = expr->get();
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const auto& inputs = expr->inputs();
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auto param = inputs[0];
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auto indice = inputs[1];
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auto dims = indice->getInfo()->dim;
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dims.emplace_back(1);
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indice = _Reshape(indice, dims);
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int axis = 0;
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std::vector<VARP> res(inputs.size());
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if (inputs.size() > 2) {
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axis = inputs[2]->readMap<int>()[0];
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}
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if (axis != 0) {
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MNN_ERROR("Current's don't support axis != 0 grad for gather\n");
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return res;
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}
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auto shape = _Shape(param);
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auto diff = _Unsqueeze(backwardOutput[0], {axis});
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res[0] = _ScatterNd(indice, diff, shape);
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return res;
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}
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};
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static void _create() {
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static GatherGrad _c;
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OpGrad::insert((int)OpType_GatherV2, &_c);
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}
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REGISTER_GRAD(GatherGrad_cpp, _create);
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};
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