/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.

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 TENSORFLOW_LITE_DELEGATES_COREML_BUILDERS_THRESHOLD_LAYER_BUILDER_H_
#define TENSORFLOW_LITE_DELEGATES_COREML_BUILDERS_THRESHOLD_LAYER_BUILDER_H_

#include <string>

#include "mlmodel/format/NeuralNetwork.pb.h"
#include "tensorflow/lite/c/c_api_types.h"
#include "tensorflow/lite/c/common.h"
#include "tensorflow/lite/delegates/coreml/builders/op_builder.h"

namespace tflite {
namespace delegates {
namespace coreml {

// Layer that provides threshold operation. Depending on scale, this can be used
// as max (scale > 0) or min (scale < 0), in combination with another negative
// linear activation layer) operation.
// TODO(karimnosseir): Generalize to other unary operators.
class ThresholdLayerBuilder : public OpBuilder {
 public:
  explicit ThresholdLayerBuilder(GraphBuilder* graph_builder)
      : OpBuilder(graph_builder) {}

  const std::string& DebugName() override;

  CoreML::Specification::NeuralNetworkLayer* Build() override;

  void SetAlpha(float alpha) { alpha_ = alpha; }

  void SetScale(float scale) { scale_ = scale; }

  TfLiteStatus RegisterInputs(const TfLiteIntArray* inputs,
                              TfLiteContext* context) override;

  TfLiteStatus RegisterOutputs(const TfLiteIntArray* outputs,
                               TfLiteContext* context) override;

 private:
  float alpha_ = 0.0f;
  float scale_ = 1.0f;
};

}  // namespace coreml
}  // namespace delegates
}  // namespace tflite

#endif  // TENSORFLOW_LITE_DELEGATES_COREML_BUILDERS_THRESHOLD_LAYER_BUILDER_H_
