mirror of https://github.com/alibaba/MNN.git
49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
//
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// InterpGrad.cpp
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// MNN
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//
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// Created by MNN on 2019/12/13.
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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 InterpGrad : 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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// FIXME, the grad may be compute a little error
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auto shapeInfo = expr->inputs()[0]->getInfo();
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MNN_ASSERT(nullptr != shapeInfo && shapeInfo->dim.size() == 4);
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std::vector<VARP> res{nullptr};
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std::vector<int> shapeSize{shapeInfo->dim[2], shapeInfo->dim[3]};
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VARP interpShape = _Const(shapeSize.data(), {2}, NHWC, halide_type_of<int>());
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std::unique_ptr<OpT> interpOp(new OpT);
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interpOp->type = OpType_Interp;
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interpOp->main.type = OpParameter_Interp;
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interpOp->main.value = new InterpT;
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if (OpType_Resize == op->type()) {
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interpOp->main.AsInterp()->alignCorners = false;
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interpOp->main.AsInterp()->resizeType = 2; // Bilinear
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} else {
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MNN_ASSERT(OpType_Interp == op->type());
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auto originInterpParam = op->main_as_Interp();
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interpOp->main.AsInterp()->resizeType = originInterpParam->resizeType();
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interpOp->main.AsInterp()->alignCorners = originInterpParam->alignCorners();
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}
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res[0] = Variable::create(Expr::create(interpOp.get(), {backwardOutput[0], interpShape}));
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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 InterpGrad _c;
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OpGrad::insert((int)OpType_Interp, &_c);
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OpGrad::insert((int)OpType_Resize, &_c);
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return true;
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}();
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