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whisper.cpp
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port fft to pocketfft

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pull/583/head
Ryan Hileman 1 year ago
parent 09e9068007
commit d1f16463fa
3 changed files with 3639 additions and 121 deletions
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LICENSE
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@ -1,4 +1,4 @@
MIT License
whisper.cpp (MIT License)
Copyright (c) 2022 Georgi Gerganov
@ -19,3 +19,33 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
---
pocketfft.h (BSD 3-Clause License)
Copyright (C) 2010-2018 Max-Planck-Society
All rights reserved.
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.
* Neither the name of the copyright holder nor the names of its contributors may
be used to endorse or promote products derived from this software without
specific prior written permission.
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 COPYRIGHT HOLDER 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.

3581
pocketfft.h
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147
whisper.cpp
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@ -2,6 +2,7 @@
#include "whisper.h"
#include "ggml.h"
#include "pocketfft.h"
#include <algorithm>
#include <cassert>
@ -2202,84 +2203,15 @@ static std::string to_timestamp(int64_t t, bool comma = false) {
return std::string(buf);
}
// naive Discrete Fourier Transform
// input is real-valued
// output is complex-valued
static void dft(const std::vector<float> & in, std::vector<float> & out) {
int N = in.size();
out.resize(N*2);
for (int k = 0; k < N; k++) {
float re = 0;
float im = 0;
for (int n = 0; n < N; n++) {
float angle = 2*M_PI*k*n/N;
re += in[n]*cos(angle);
im -= in[n]*sin(angle);
}
out[k*2 + 0] = re;
out[k*2 + 1] = im;
}
template <typename T>
static inline T *fft_alloc(size_t size) {
return reinterpret_cast<T *>(pocketfft::detail::aligned_alloc((size_t)16, size * sizeof(T)));
}
// Cooley-Tukey FFT
// poor man's implementation - use something better
// input is real-valued
// output is complex-valued
static void fft(const std::vector<float> & in, std::vector<float> & out) {
out.resize(in.size()*2);
int N = in.size();
if (N == 1) {
out[0] = in[0];
out[1] = 0;
return;
}
if (N%2 == 1) {
dft(in, out);
return;
}
std::vector<float> even;
std::vector<float> odd;
even.reserve(N/2);
odd.reserve(N/2);
for (int i = 0; i < N; i++) {
if (i % 2 == 0) {
even.push_back(in[i]);
} else {
odd.push_back(in[i]);
}
}
std::vector<float> even_fft;
std::vector<float> odd_fft;
fft(even, even_fft);
fft(odd, odd_fft);
for (int k = 0; k < N/2; k++) {
float theta = 2*M_PI*k/N;
float re = cos(theta);
float im = -sin(theta);
float re_odd = odd_fft[2*k + 0];
float im_odd = odd_fft[2*k + 1];
out[2*k + 0] = even_fft[2*k + 0] + re*re_odd - im*im_odd;
out[2*k + 1] = even_fft[2*k + 1] + re*im_odd + im*re_odd;
out[2*(k + N/2) + 0] = even_fft[2*k + 0] - re*re_odd + im*im_odd;
out[2*(k + N/2) + 1] = even_fft[2*k + 1] - re*im_odd - im*re_odd;
}
template <typename T>
static inline void fft_dealloc(T *ptr) {
return pocketfft::detail::aligned_dealloc(ptr);
}
// ref: https://github.com/openai/whisper/blob/main/whisper/audio.py#L92-L124
@ -2313,18 +2245,19 @@ static bool log_mel_spectrogram(
//printf("%s: n_samples = %d, n_len = %d\n", __func__, n_samples, mel.n_len);
//printf("%s: recording length: %f s\n", __func__, (float) n_samples/sample_rate);
std::vector<float> worker_max(n_threads, 0.0);
std::vector<std::thread> workers(n_threads);
for (int iw = 0; iw < n_threads; ++iw) {
workers[iw] = std::thread([&](int ith) {
std::vector<float> fft_in;
fft_in.resize(fft_size);
for (int i = 0; i < fft_size; i++) {
fft_in[i] = 0.0;
}
float *fft_in = fft_alloc<float>(fft_size);
std::fill(fft_in, fft_in + fft_size, 0.0);
std::complex<float> *fft_out = fft_alloc<std::complex<float>>(n_fft);
std::vector<float> fft_out;
fft_out.resize(2*fft_size);
pocketfft::shape_t fft_shape = {(size_t)fft_size};
pocketfft::stride_t fft_stride_real = {(ptrdiff_t)sizeof(float)};
pocketfft::stride_t fft_stride_complex = {(ptrdiff_t)sizeof(std::complex<float>)};
float max = -1e20;
for (int i = ith; i < mel.n_len; i += n_threads) {
const int offset = i*fft_step;
@ -2337,47 +2270,32 @@ static bool log_mel_spectrogram(
}
}
// FFT -> mag^2
fft(fft_in, fft_out);
for (int j = 0; j < fft_size; j++) {
fft_out[j] = (fft_out[2*j + 0]*fft_out[2*j + 0] + fft_out[2*j + 1]*fft_out[2*j + 1]);
}
for (int j = 1; j < fft_size/2; j++) {
//if (i == 0) {
// printf("%d: %f %f\n", j, fft_out[j], fft_out[fft_size - j]);
//}
fft_out[j] += fft_out[fft_size - j];
}
if (i == 0) {
//for (int j = 0; j < fft_size; j++) {
// printf("%d: %e\n", j, fft_out[j]);
//}
pocketfft::r2c<float>(fft_shape, fft_stride_real, fft_stride_complex, 0, pocketfft::FORWARD, fft_in, fft_out, 1.0, 1);
for (int j = 0; j < n_fft; j++) {
fft_out[j] = std::norm(fft_out[j]);
}
if (speed_up) {
// scale down in the frequency domain results in a speed up in the time domain
for (int j = 0; j < n_fft; j++) {
fft_out[j] = 0.5*(fft_out[2*j] + fft_out[2*j + 1]);
fft_out[j].real(0.5 * fft_out[j].real());
}
}
// mel spectrogram
for (int j = 0; j < mel.n_mel; j++) {
double sum = 0.0;
for (int k = 0; k < n_fft; k++) {
sum += fft_out[k]*filters.data[j*n_fft + k];
}
if (sum < 1e-10) {
sum = 1e-10;
sum += fft_out[k].real() * filters.data[j*n_fft + k];
}
sum = log10(sum);
sum = log10(std::max(sum, 1e-10));
mel.data[j*mel.n_len + i] = sum;
max = std::max((float)sum, max);
}
}
worker_max[ith] = max;
fft_dealloc(fft_in);
fft_dealloc(fft_out);
}, iw);
}
@ -2386,22 +2304,11 @@ static bool log_mel_spectrogram(
}
// clamping and normalization
double mmax = -1e20;
for (int i = 0; i < mel.n_mel*mel.n_len; i++) {
if (mel.data[i] > mmax) {
mmax = mel.data[i];
}
}
float mmax = *std::max_element(worker_max.begin(), worker_max.end()) - 8.0;
//printf("%s: max = %f\n", __func__, mmax);
mmax -= 8.0;
for (int i = 0; i < mel.n_mel*mel.n_len; i++) {
if (mel.data[i] < mmax) {
mel.data[i] = mmax;
}
mel.data[i] = (mel.data[i] + 4.0)/4.0;
mel.data[i] = (std::max(mel.data[i], mmax) + 4.0)/4.0;
}
wstate.t_mel_us += ggml_time_us() - t_start_us;

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