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gemma.cpp/compression/compress_weights.cc

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// 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
//
// https://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.
// Command line tool to create compressed weights.
// Compiles this file for multiple architectures via "foreach_target.h", to
// which we pass the filename via macro 'argument'.
#undef HWY_TARGET_INCLUDE
#define HWY_TARGET_INCLUDE \
"compression/compress_weights.cc" // NOLINT
#include "hwy/foreach_target.h" // IWYU pragma: keep
// Must come after foreach_target.h to avoid redefinition errors.
#include "compression/compress-inl.h"
#include "hwy/highway.h"
#ifndef GEMMA_COMPRESS_WEIGHTS_ONCE
#define GEMMA_COMPRESS_WEIGHTS_ONCE
#include <stddef.h>
#include <stdio.h>
#include <algorithm> // std::clamp
#include <cstdlib>
#include <iostream>
#include <string>
#include <thread> // NOLINT
#include "compression/io.h" // Path
#include "compression/weights_raw.h"
#include "gemma/common.h" // Model
#include "gemma/weights.h"
#include "util/args.h"
#include "hwy/base.h"
#include "hwy/contrib/thread_pool/thread_pool.h"
#include "hwy/profiler.h"
namespace gcpp {
// Setting this to true disables fread() calls that read the model file.
constexpr bool kDryRunFread = false;
namespace {
float ScaleWeights(float* data, size_t len) {
float maxabs = 0.0;
for (size_t i = 0; i < len; ++i) {
maxabs = std::max(maxabs, std::abs(data[i]));
}
const float kMaxRange = 1.875f;
if (maxabs <= kMaxRange) {
return 1.0f;
}
const float scale = maxabs / kMaxRange;
const float inv_scale = 1.0f / scale;
for (size_t i = 0; i < len; ++i) {
data[i] *= inv_scale;
}
return scale;
}
#define READ_WEIGHTS(name) \
do { \
do_fread(&(layer_view->name), layer, #name, sizeof(layer_view->name)); \
} while (0)
#define SCALE_WEIGHTS(name) \
do { \
if (ok && !kDryRunFread && scale_for_compression) { \
weights->scales[scale_pos++] = \
ScaleWeights(layer_view->name.data(), layer_view->name.size()); \
} \
} while (0)
template <typename TConfig>
struct LoadRawWeightsT {
ByteStorageT operator()(const Path& checkpoint, hwy::ThreadPool& pool,
bool scale_for_compression) const {
PROFILER_ZONE("Startup.LoadWeights");
if (!checkpoint.Exists()) {
HWY_ABORT("The model weights file '%s' does not exist.",
checkpoint.path.c_str());
}
ByteStorageT weights_u8 = AllocateWeightsF<TConfig>()(pool);
auto* weights = reinterpret_cast<WeightsF<TConfig>*>(weights_u8.get());
size_t scale_pos = 0;
FILE* fptr;
if constexpr (kDryRunFread) {
fprintf(stderr, "Dry-Run, not reading model-file.\n");
} else {
fptr = fopen(checkpoint.path.c_str(), "rb");
if (fptr == nullptr) {
HWY_ABORT("Failed to open model file %s - does it exist?",
checkpoint.path.c_str());
}
}
bool ok = true;
uint64_t total_size = 0;
auto do_fread = [&](void* var, int layer, const char* name, size_t size) {
if (layer == -1) {
fprintf(stderr, "Loading Parameters (size %zu): %s\n", size, name);
} else {
fprintf(stderr, "Loading Parameters (layer=%d, size %zu): %s\n", layer,
size, name);
}
if constexpr (!kDryRunFread) {
ok &= 1 == fread(var, size, 1, fptr);
total_size += size;
}
};
do_fread(&(weights->embedder_input_embedding), -1,
"embedder_input_embedding",
sizeof(weights->embedder_input_embedding));
do_fread(&(weights->final_norm_scale), -1, "final_norm_scale",
sizeof(weights->final_norm_scale));
for (size_t layer = 0; layer < TConfig::kLayers; ++layer) {
auto type = TConfig::kLayerConfig[layer];
LayerF<TConfig>* layer_view = weights->GetLayer(layer);
// Make sure we don't have uninitialized memory.
hwy::ZeroBytes(layer_view, sizeof(*layer_view));
if (type == LayerAttentionType::kGemma) {
READ_WEIGHTS(attn_vec_einsum_w);
READ_WEIGHTS(qkv_einsum_w);
SCALE_WEIGHTS(attn_vec_einsum_w);
SCALE_WEIGHTS(qkv_einsum_w);
} else {
READ_WEIGHTS(griffin.linear_x_w);
READ_WEIGHTS(griffin.linear_x_biases);
READ_WEIGHTS(griffin.linear_y_w);
READ_WEIGHTS(griffin.linear_y_biases);
READ_WEIGHTS(griffin.linear_out_w);
READ_WEIGHTS(griffin.linear_out_biases);
READ_WEIGHTS(griffin.conv_w);
READ_WEIGHTS(griffin.conv_biases);
READ_WEIGHTS(griffin.gate_w);
READ_WEIGHTS(griffin.gate_biases);
READ_WEIGHTS(griffin.a);
SCALE_WEIGHTS(griffin.linear_x_w);
SCALE_WEIGHTS(griffin.linear_y_w);
SCALE_WEIGHTS(griffin.linear_out_w);
SCALE_WEIGHTS(griffin.gate_w);
}
READ_WEIGHTS(gating_einsum_w);
READ_WEIGHTS(linear_w);
SCALE_WEIGHTS(gating_einsum_w);
SCALE_WEIGHTS(linear_w);
READ_WEIGHTS(pre_attention_norm_scale);
READ_WEIGHTS(pre_ffw_norm_scale);
if (TConfig::kPostNorm == PostNormType::Scale) {
READ_WEIGHTS(post_attention_norm_scale);
READ_WEIGHTS(post_ffw_norm_scale);
}
if (TConfig::kFFBiases) {
READ_WEIGHTS(ffw_gating_biases);
READ_WEIGHTS(ffw_output_biases);
}
if (TConfig::kSoftmaxAttnOutputBiases &&
type == LayerAttentionType::kGemma) {
READ_WEIGHTS(attention_output_biases);
}
}
if (!ok) {
HWY_ABORT(
"Failed to read from %s - might be a directory, or too small? "
"expected size: %d kB",
checkpoint.path.c_str(), static_cast<uint32_t>(total_size >> 10));
}
if (!kDryRunFread) {
HWY_ASSERT(0 == fclose(fptr));
if (scale_for_compression) {
HWY_ASSERT(scale_pos == TConfig::kNumTensorScales);
}
}
return weights_u8;
}
};
#undef READ_WEIGHTS
#undef SCALE_WEIGHTS
} // namespace
ByteStorageT LoadRawWeights(const Path& weights, Model model_type,
Type weight_type, hwy::ThreadPool& pool,
bool scale_for_compression) {
return CallForModelAndWeight<LoadRawWeightsT>(
model_type, weight_type, weights, pool, scale_for_compression);
}
struct Args : public ArgsBase<Args> {
static constexpr size_t kDefaultNumThreads = ~size_t{0};
void ChooseNumThreads() {
if (num_threads == kDefaultNumThreads) {
// This is a rough heuristic, replace with something better in the future.
num_threads = static_cast<size_t>(std::clamp(
static_cast<int>(std::thread::hardware_concurrency()) - 2, 1, 18));
}
}
public:
Args(int argc, char* argv[]) {
InitAndParse(argc, argv);
ChooseNumThreads();
}
// Returns error string or nullptr if OK.
const char* Validate() {
ModelTraining model_training;
if (const char* err = ParseModelTypeAndTraining(model_type_str, model_type_,
model_training)) {
return err;
}
if (const char* err = ParseType(weight_type_str, weight_type_)) {
return err;
}
if (weights.path.empty()) {
return "Missing --weights flag, a file for the uncompressed model.";
}
if (compressed_weights.path.empty()) {
return "Missing --compressed_weights flag, a file for the compressed "
"model.";
}
if (!weights.Exists()) {
return "Can't open file specified with --weights flag.";
}
return nullptr;
}
Path weights; // uncompressed weights file location
Path compressed_weights; // compressed weights file location
std::string model_type_str;
std::string weight_type_str;
size_t num_threads;
template <class Visitor>
void ForEach(const Visitor& visitor) {
visitor(weights, "weights", Path(),
"Path to model weights (.bin) file.\n"
" Required argument.");
visitor(model_type_str, "model", std::string(),
"Model type\n 2b-it = 2B parameters, instruction-tuned\n "
"2b-pt = 2B parameters, pretrained\n 7b-it = 7B parameters "
"instruction-tuned\n 7b-pt = 7B parameters, pretrained\n "
"gr2b-it = griffin 2B parameters, instruction-tuned\n "
"gr2b-pt = griffin 2B parameters, pretrained\n "
" Required argument.");
visitor(weight_type_str, "weight_type", std::string("sfp"),
"Weight type\n f32 = float, bf16 = bfloat16, SFP = 8-bit FP\n"
" Required argument.");
visitor(compressed_weights, "compressed_weights", Path(),
"Path name where compressed weights (.sbs) file will be written.\n"
" Required argument.");
visitor(num_threads, "num_threads",
kDefaultNumThreads, // see ChooseNumThreads
"Number of threads to use.\n Default = Estimate of the "
"number of supported concurrent threads.",
2);
}
// Uninitialized before Validate, must call after that.
gcpp::Model ModelType() const { return model_type_; }
gcpp::Type WeightType() const { return weight_type_; }
private:
Model model_type_;
Type weight_type_;
};
void ShowHelp(gcpp::Args& args) {
std::cerr
<< "Usage:\n./compress_weights --weights <path to uncompressed weights> "
" --model <model type> --compressed_weights <output path>\n";
std::cerr << "\n*Arguments*\n\n";
args.Help();
std::cerr << "\n";
}
} // namespace gcpp
#endif // GEMMA_COMPRESS_WEIGHTS_ONCE
// SIMD code, compiled once per target.
HWY_BEFORE_NAMESPACE();
namespace gcpp {
namespace HWY_NAMESPACE {
template <class TConfig>
void CompressWeights(const Path& weights_path,
const Path& compressed_weights_path, Model model_type,
Type weight_type, hwy::ThreadPool& pool) {
if (!weights_path.Exists()) {
HWY_ABORT("The model weights file '%s' does not exist.",
weights_path.path.c_str());
}
// Allocate compressed weights.
using CWeights = CompressedWeights<TConfig>;
ByteStorageT c_weights_u8 = AllocateSizeof<CWeights>();
CWeights* c_weights = reinterpret_cast<CWeights*>(c_weights_u8.get());
new (&c_weights->c_layer_ptrs) CompressedLayerPointers<TConfig>(pool);
// Get weights, compress, and store.
const bool scale_for_compression = TConfig::kNumTensorScales > 0;
const ByteStorageT weights_u8 = gcpp::LoadRawWeights(
weights_path, model_type, weight_type, pool, scale_for_compression);
WeightsF<TConfig>* weights =
reinterpret_cast<WeightsF<TConfig>*>(weights_u8.get());
Compressor compressor(pool);
ForEachTensor<TConfig, LayerF<TConfig>>(weights, *c_weights, compressor);
compressor.AddScales(weights->scales.data(), weights->scales.size());
compressor.WriteAll(pool, compressed_weights_path);
weights->layer_ptrs.~LayerPointers<float, TConfig>();
c_weights->c_layer_ptrs.~CompressedLayerPointers<TConfig>();
}
} // namespace HWY_NAMESPACE
} // namespace gcpp
HWY_AFTER_NAMESPACE();
#if HWY_ONCE
namespace gcpp {
void Run(Args& args) {
hwy::ThreadPool pool(args.num_threads);
const Model model_type = args.ModelType();
const Type weight_type = args.WeightType();
GEMMA_EXPORT_AND_DISPATCH(
model_type, weight_type, CompressWeights,
(args.weights, args.compressed_weights, model_type, weight_type, pool));
}
} // namespace gcpp
int main(int argc, char** argv) {
gcpp::Args args(argc, argv);
if (gcpp::HasHelp(argc, argv)) {
gcpp::ShowHelp(args);
return 0;
}
if (const char* error = args.Validate()) {
gcpp::ShowHelp(args);
HWY_ABORT("\nInvalid args: %s", error);
}
gcpp::Run(args);
return 0;
}
#endif // HWY_ONCE
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