bcec8b0b21
This is from the upstream library commit id 3326535126e435f1ba647885ce43a8f0f3d317eb, corresponding to Chromium 88.0.4290.1.
103 lines
4.6 KiB
C++
103 lines
4.6 KiB
C++
/* 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_
|