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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __NNFW_RT_ACTIVATION_FUNCTOR_H__
+#define __NNFW_RT_ACTIVATION_FUNCTOR_H__
+
+#if 0 // REF-ANN
+#include "android/log.h"
+#endif
+
+#include <algorithm>
+#include <cmath>
+#include <vector>
+#include <cstdint>
+
+enum ActivationFn {
+ kActivationNone = 0,
+ kActivationRelu,
+ kActivationRelu1,
+ kActivationRelu6,
+ kActivationTanh,
+ kActivationSignBit,
+ kActivationSigmoid,
+};
+
+class ActivationFunctor {
+ public:
+ explicit ActivationFunctor(ActivationFn act) : act_(act) {}
+
+ float operator()(float a) const {
+ switch (act_) {
+ case kActivationNone:
+ return a;
+ case kActivationRelu:
+ return a < 0.f ? 0.f : a;
+ case kActivationRelu6:
+ return std::max(0.f, std::min(a, 6.f));
+ case kActivationTanh:
+ return std::tanh(a);
+ case kActivationSigmoid:
+ return 1.0f / (1.0f + std::exp(-a));
+ default:
+#if 0 // REF-ANN
+ __android_log_print(ANDROID_LOG_ERROR, "NN API",
+ "Invalid enum value for activation function: 0x%0X",
+ act_);
+#endif
+ exit(1);
+ }
+ }
+
+ private:
+ ActivationFn act_;
+};
+
+#endif // __NNFW_RT_ACTIVATION_FUNCTOR_H__