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Diffstat (limited to 'webrtc/third_party/rnnoise/src/rnn_activations.h')
| -rw-r--r-- | webrtc/third_party/rnnoise/src/rnn_activations.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/webrtc/third_party/rnnoise/src/rnn_activations.h b/webrtc/third_party/rnnoise/src/rnn_activations.h new file mode 100644 index 0000000..af81031 --- /dev/null +++ b/webrtc/third_party/rnnoise/src/rnn_activations.h @@ -0,0 +1,102 @@ +/* Copyright (c) 2008-2011 Octasic Inc. + 2012-2017 Jean-Marc Valin */ +/* + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR + CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#ifndef THIRD_PARTY_RNNOISE_SRC_RNN_ACTIVATIONS_H_ +#define THIRD_PARTY_RNNOISE_SRC_RNN_ACTIVATIONS_H_ + +#include <cmath> + +namespace rnnoise { + +inline float TansigApproximated(float x) { + static constexpr float kTansigTable[201] = { + 0.000000f, 0.039979f, 0.079830f, 0.119427f, 0.158649f, 0.197375f, + 0.235496f, 0.272905f, 0.309507f, 0.345214f, 0.379949f, 0.413644f, + 0.446244f, 0.477700f, 0.507977f, 0.537050f, 0.564900f, 0.591519f, + 0.616909f, 0.641077f, 0.664037f, 0.685809f, 0.706419f, 0.725897f, + 0.744277f, 0.761594f, 0.777888f, 0.793199f, 0.807569f, 0.821040f, + 0.833655f, 0.845456f, 0.856485f, 0.866784f, 0.876393f, 0.885352f, + 0.893698f, 0.901468f, 0.908698f, 0.915420f, 0.921669f, 0.927473f, + 0.932862f, 0.937863f, 0.942503f, 0.946806f, 0.950795f, 0.954492f, + 0.957917f, 0.961090f, 0.964028f, 0.966747f, 0.969265f, 0.971594f, + 0.973749f, 0.975743f, 0.977587f, 0.979293f, 0.980869f, 0.982327f, + 0.983675f, 0.984921f, 0.986072f, 0.987136f, 0.988119f, 0.989027f, + 0.989867f, 0.990642f, 0.991359f, 0.992020f, 0.992631f, 0.993196f, + 0.993718f, 0.994199f, 0.994644f, 0.995055f, 0.995434f, 0.995784f, + 0.996108f, 0.996407f, 0.996682f, 0.996937f, 0.997172f, 0.997389f, + 0.997590f, 0.997775f, 0.997946f, 0.998104f, 0.998249f, 0.998384f, + 0.998508f, 0.998623f, 0.998728f, 0.998826f, 0.998916f, 0.999000f, + 0.999076f, 0.999147f, 0.999213f, 0.999273f, 0.999329f, 0.999381f, + 0.999428f, 0.999472f, 0.999513f, 0.999550f, 0.999585f, 0.999617f, + 0.999646f, 0.999673f, 0.999699f, 0.999722f, 0.999743f, 0.999763f, + 0.999781f, 0.999798f, 0.999813f, 0.999828f, 0.999841f, 0.999853f, + 0.999865f, 0.999875f, 0.999885f, 0.999893f, 0.999902f, 0.999909f, + 0.999916f, 0.999923f, 0.999929f, 0.999934f, 0.999939f, 0.999944f, + 0.999948f, 0.999952f, 0.999956f, 0.999959f, 0.999962f, 0.999965f, + 0.999968f, 0.999970f, 0.999973f, 0.999975f, 0.999977f, 0.999978f, + 0.999980f, 0.999982f, 0.999983f, 0.999984f, 0.999986f, 0.999987f, + 0.999988f, 0.999989f, 0.999990f, 0.999990f, 0.999991f, 0.999992f, + 0.999992f, 0.999993f, 0.999994f, 0.999994f, 0.999994f, 0.999995f, + 0.999995f, 0.999996f, 0.999996f, 0.999996f, 0.999997f, 0.999997f, + 0.999997f, 0.999997f, 0.999997f, 0.999998f, 0.999998f, 0.999998f, + 0.999998f, 0.999998f, 0.999998f, 0.999999f, 0.999999f, 0.999999f, + 0.999999f, 0.999999f, 0.999999f, 0.999999f, 0.999999f, 0.999999f, + 0.999999f, 0.999999f, 0.999999f, 0.999999f, 1.000000f, 1.000000f, + 1.000000f, 1.000000f, 1.000000f, 1.000000f, 1.000000f, 1.000000f, + 1.000000f, 1.000000f, 1.000000f, + }; + + // Tests are reversed to catch NaNs. + if (!(x < 8.f)) + return 1.f; + if (!(x > -8.f)) + return -1.f; + float sign = 1.f; + if (x < 0.f) { + x = -x; + sign = -1.f; + } + // Look-up. + int i = static_cast<int>(std::floor(0.5f + 25 * x)); + float y = kTansigTable[i]; + // Map i back to x's scale (undo 25 factor). + x -= 0.04f * i; + y = y + x * (1.f - y * y) * (1.f - y * x); + return sign * y; +} + +inline float SigmoidApproximated(const float x) { + return 0.5f + 0.5f * TansigApproximated(0.5f * x); +} + +inline float RectifiedLinearUnit(const float x) { + return x < 0.f ? 0.f : x; +} + +} // namespace rnnoise + +#endif // THIRD_PARTY_RNNOISE_SRC_RNN_ACTIVATIONS_H_ |