Implementation of Max Pool in cpp

There is a Max Pool implementation with its unit test.

include/aidge/backend/cpu/operator/MaxPoolingImpl.hpp

+/********************************************************************************
+ * Copyright (c) 2023 CEA-List
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ ********************************************************************************/
+
+#ifndef AIDGE_CPU_OPERATOR_MaxPOOLINGIMPL_H_
+#define AIDGE_CPU_OPERATOR_MaxPOOLINGIMPL_H_
+
+#include <array>
+#include <memory>
+#include <tuple>
+#include <vector>
+
+#include "aidge/backend/OperatorImpl.hpp"
+#include "aidge/operator/MaxPooling.hpp"
+#include "aidge/utils/Registrar.hpp"
+#include "aidge/utils/Types.h"
+
+namespace Aidge {
+// class MaxPooling_Op;
+
+// compute kernel registry for forward and backward
+class MaxPoolingImpl2DForward_cpu
+    : public Registrable<MaxPoolingImpl2DForward_cpu,
+                         std::tuple<DataType, DataType>,
+                         void(const MaxPooling_Op<2>::Attrs &, const std::array<DimSize_t, 4> &, const void *, void *)> {};
+class MaxPoolingImpl2DBackward_cpu
+    : public Registrable<MaxPoolingImpl2DBackward_cpu,
+                         std::tuple<DataType, DataType>,
+                         void(const MaxPooling_Op<2>::Attrs &, const std::array<DimSize_t, 4> &, const void *, void *)> {};
+
+class MaxPoolingImpl2D_cpu : public OperatorImpl {
+   private:
+    const MaxPooling_Op<2> &mOp;
+    std::array<NbElts_t, 1> mNbConsumedData;
+    std::array<NbElts_t, 1> mNbProducedData;
+
+   public:
+    MaxPoolingImpl2D_cpu(const MaxPooling_Op<2> &op) : mOp(op), mNbConsumedData({0}), mNbProducedData({0}) {}
+
+    static std::unique_ptr<MaxPoolingImpl2D_cpu> create(const MaxPooling_Op<2> &op) {
+        return std::make_unique<MaxPoolingImpl2D_cpu>(op);
+    }
+
+   public:
+    NbElts_t getNbRequiredData(const IOIndex_t inputIdx) const override final;
+    NbElts_t getNbRequiredProtected(const IOIndex_t inputIdx) const override final;
+    NbElts_t getRequiredMemory(const IOIndex_t /*outputIdx*/, const std::vector<DimSize_t> &inputsSize) const override final;
+    NbElts_t getNbConsumedData(const IOIndex_t inputIdx) const override final;
+    NbElts_t getNbProducedData(const IOIndex_t outputIdx) const override final;
+    void updateConsummerProducer() override final;
+
+    void forward();
+
+    void backward();
+};
+
+namespace {
+// add cpu backend to MaxPooling_Op<2> implementation registry
+static Registrar<MaxPooling_Op<2>> registrarMaxPoolingImpl2D_cpu("cpu", Aidge::MaxPoolingImpl2D_cpu::create);
+}  // namespace
+}  // namespace Aidge
+
+#endif /* AIDGE_CPU_OPERATOR_MaxPOOLINGIMPL_H_ */