blob: d23957a6f2eb5770b64d33caf22da41d827ed388 [file] [log] [blame]
* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include <array>
#include <vector>
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "api/function_view.h"
#include "modules/audio_processing/agc2/cpu_features.h"
#include "modules/audio_processing/agc2/rnn_vad/vector_math.h"
namespace webrtc {
namespace rnn_vad {
// Activation function for a neural network cell.
enum class ActivationFunction { kTansigApproximated, kSigmoidApproximated };
// Maximum number of units for an FC layer.
constexpr int kFullyConnectedLayerMaxUnits = 24;
// Fully-connected layer with a custom activation function which owns the output
// buffer.
class FullyConnectedLayer {
// Ctor. `output_size` cannot be greater than `kFullyConnectedLayerMaxUnits`.
FullyConnectedLayer(int input_size,
int output_size,
rtc::ArrayView<const int8_t> bias,
rtc::ArrayView<const int8_t> weights,
ActivationFunction activation_function,
const AvailableCpuFeatures& cpu_features,
absl::string_view layer_name);
FullyConnectedLayer(const FullyConnectedLayer&) = delete;
FullyConnectedLayer& operator=(const FullyConnectedLayer&) = delete;
// Returns the size of the input vector.
int input_size() const { return input_size_; }
// Returns the pointer to the first element of the output buffer.
const float* data() const { return; }
// Returns the size of the output buffer.
int size() const { return output_size_; }
// Computes the fully-connected layer output.
void ComputeOutput(rtc::ArrayView<const float> input);
const int input_size_;
const int output_size_;
const std::vector<float> bias_;
const std::vector<float> weights_;
const VectorMath vector_math_;
rtc::FunctionView<float(float)> activation_function_;
// Over-allocated array with size equal to `output_size_`.
std::array<float, kFullyConnectedLayerMaxUnits> output_;
} // namespace rnn_vad
} // namespace webrtc