mirror of https://github.com/alibaba/MNN.git
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//
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// SliceGrad.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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using namespace std;
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using namespace MNN;
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using namespace MNN::Express;
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class SliceGrad : 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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MNN_ASSERT(expr->inputs().size() == 1);
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auto slice = expr->get()->main_as_Slice();
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auto axis = slice->axis();
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std::vector<VARP> res{nullptr};
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std::vector<VARP> validBackward(backwardOutput.size());
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for (int i = 0; i < backwardOutput.size(); ++i) {
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auto origin = Variable::create(expr, i);
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if (nullptr != backwardOutput[i]) {
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validBackward[i] = backwardOutput[i];
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continue;
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}
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auto info = origin->getInfo();
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if (nullptr == info) {
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MNN_ERROR("Error for sliceGrad's %d output\n", i);
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return res;
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}
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validBackward[i] = _Const(0.0f, info->dim, info->order);
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}
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res[0] = _Concat(validBackward, axis);
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// FUNC_PRINT_ALL(_Sum(res[0], {})->readMap<float>()[0], f);
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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 SliceGrad _c;
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OpGrad::insert((int)OpType_Slice, &_c);
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return true;
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}();
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