chore: import upstream snapshot with attribution

2026-07-13 13:33:03 +08:00
commit 5b57521aa1
8226 changed files with 3425766 additions and 0 deletions
@@ -0,0 +1,46 @@
+//
+//  PoolGrad.cpp
+//  MNN
+//
+//  Created by MNN on 2019/04/22.
+//  Copyright © 2018, Alibaba Group Holding Limited
+//
+
+#include "PoolGrad.hpp"
+#include "core/Macro.h"
+using namespace std;
+namespace MNN {
+using namespace MNN::Express;
+
+class PoolGrad : public OpGrad {
+public:
+    PoolGrad() {
+        mType = SEMI_LINEAR;
+    }
+
+    virtual std::vector<Express::VARP> onGrad(Express::EXPRP expr,
+                                              const std::vector<Express::VARP>& backwardOutput) override {
+        std::vector<Express::VARP> result(1, nullptr);
+        auto outputDiff = backwardOutput[0];
+        std::unique_ptr<OpT> forwardOp(expr->get()->UnPack());
+        unique_ptr<OpT> newOp(new OpT);
+        newOp->type       = OpType_PoolGrad;
+        auto copyP        = new PoolT(*forwardOp->main.AsPool());
+        newOp->main.type  = OpParameter_Pool;
+        newOp->main.value = copyP;
+
+        result[0] = Variable::create(
+            Expr::create(std::move(newOp), {expr->inputs()[0], Variable::create(expr, 0), outputDiff}));
+        return result;
+    }
+};
+
+static void _create() {
+    static PoolGrad _c;
+    OpGrad::insert(OpType_Pooling, &_c);
+
+}
+
+REGISTER_GRAD(PoolGrad_cpp, _create);
+};
+