blob: 3407dfcdf14bb27e19d699dd217fe4c91e922480 [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 "modules/audio_processing/agc2/cpu_features.h"
#include "modules/audio_processing/agc2/rnn_vad/vector_math.h"
namespace webrtc {
namespace rnn_vad {
// Maximum number of units for a GRU layer.
constexpr int kGruLayerMaxUnits = 24;
// Recurrent layer with gated recurrent units (GRUs) with sigmoid and ReLU as
// activation functions for the update/reset and output gates respectively.
class GatedRecurrentLayer {
// Ctor. `output_size` cannot be greater than `kGruLayerMaxUnits`.
GatedRecurrentLayer(int input_size,
int output_size,
rtc::ArrayView<const int8_t> bias,
rtc::ArrayView<const int8_t> weights,
rtc::ArrayView<const int8_t> recurrent_weights,
const AvailableCpuFeatures& cpu_features,
absl::string_view layer_name);
GatedRecurrentLayer(const GatedRecurrentLayer&) = delete;
GatedRecurrentLayer& operator=(const GatedRecurrentLayer&) = 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_; }
// Resets the GRU state.
void Reset();
// Computes the recurrent layer output and updates the status.
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 std::vector<float> recurrent_weights_;
const VectorMath vector_math_;
// Over-allocated array with size equal to `output_size_`.
std::array<float, kGruLayerMaxUnits> state_;
} // namespace rnn_vad
} // namespace webrtc