mirror of https://github.com/google/gemma.cpp.git
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
// Copyright 2024 Google LLC
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#include "compression/compress.h"
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "util/mat.h"
|
|
#include "hwy/base.h"
|
|
#include "hwy/profiler.h"
|
|
|
|
namespace gcpp {
|
|
|
|
float ScaleWeights(float* HWY_RESTRICT raw, size_t num) {
|
|
PROFILER_FUNC;
|
|
|
|
float maxabs = 0.0;
|
|
for (size_t i = 0; i < num; ++i) {
|
|
maxabs = HWY_MAX(maxabs, hwy::ScalarAbs(raw[i]));
|
|
}
|
|
if (maxabs <= SfpStream::kMax) {
|
|
return 1.0f;
|
|
}
|
|
const float scale = maxabs / SfpStream::kMax;
|
|
const float inv_scale = static_cast<float>(1.0 / static_cast<double>(scale));
|
|
for (size_t i = 0; i < num; ++i) {
|
|
// Clamp because kMax may still be exceeded.
|
|
const float magn =
|
|
HWY_MIN(SfpStream::kMax, hwy::ScalarAbs(raw[i] * inv_scale));
|
|
raw[i] = hwy::ScalarCopySign(magn, raw[i]);
|
|
}
|
|
return scale;
|
|
}
|
|
|
|
} // namespace gcpp
|