gpt4all/gpt4all-backend/llmodel.cpp

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#include "llmodel.h"
#include "dlhandle.h"
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <filesystem>
#include <cassert>
#include <cstdlib>
#include <sstream>
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std::string s_implementations_search_path = ".";
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static bool has_at_least_minimal_hardware() {
#ifdef __x86_64__
#ifndef _MSC_VER
return __builtin_cpu_supports("avx");
#else
int cpuInfo[4];
__cpuid(cpuInfo, 1);
return cpuInfo[2] & (1 << 28);
#endif
#else
return true; // Don't know how to handle non-x86_64
#endif
}
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static bool requires_avxonly() {
#ifdef __x86_64__
#ifndef _MSC_VER
return !__builtin_cpu_supports("avx2");
#else
int cpuInfo[4];
__cpuidex(cpuInfo, 7, 0);
return !(cpuInfo[1] & (1 << 5));
#endif
#else
return false; // Don't know how to handle non-x86_64
#endif
}
LLModel::Implementation::Implementation(Dlhandle &&dlhandle_) : dlhandle(new Dlhandle(std::move(dlhandle_))) {
auto get_model_type = dlhandle->get<const char *()>("get_model_type");
assert(get_model_type);
modelType = get_model_type();
auto get_build_variant = dlhandle->get<const char *()>("get_build_variant");
assert(get_build_variant);
buildVariant = get_build_variant();
magicMatch = dlhandle->get<bool(std::ifstream&)>("magic_match");
assert(magicMatch);
construct_ = dlhandle->get<LLModel *()>("construct");
assert(construct_);
}
LLModel::Implementation::Implementation(Implementation &&o)
: construct_(o.construct_)
, modelType(o.modelType)
, buildVariant(o.buildVariant)
, magicMatch(o.magicMatch)
, dlhandle(o.dlhandle) {
o.dlhandle = nullptr;
}
LLModel::Implementation::~Implementation() {
if (dlhandle) delete dlhandle;
}
bool LLModel::Implementation::isImplementation(const Dlhandle &dl) {
return dl.get<bool(uint32_t)>("is_g4a_backend_model_implementation");
}
const std::vector<LLModel::Implementation> &LLModel::implementationList() {
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// NOTE: allocated on heap so we leak intentionally on exit so we have a chance to clean up the
// individual models without the cleanup of the static list interfering
static auto* libs = new std::vector<LLModel::Implementation>([] () {
std::vector<LLModel::Implementation> fres;
auto search_in_directory = [&](const std::string& paths) {
std::stringstream ss(paths);
std::string path;
// Split the paths string by the delimiter and process each path.
while (std::getline(ss, path, ';')) {
std::filesystem::path fs_path(path);
// Iterate over all libraries
for (const auto& f : std::filesystem::directory_iterator(fs_path)) {
const std::filesystem::path& p = f.path();
if (p.extension() != LIB_FILE_EXT) continue;
// Add to list if model implementation
try {
Dlhandle dl(p.string());
if (!Implementation::isImplementation(dl)) {
continue;
}
fres.emplace_back(Implementation(std::move(dl)));
} catch (...) {}
}
}
};
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search_in_directory(s_implementations_search_path);
return fres;
}());
// Return static result
return *libs;
}
const LLModel::Implementation* LLModel::implementation(std::ifstream& f, const std::string& buildVariant) {
for (const auto& i : implementationList()) {
f.seekg(0);
if (!i.magicMatch(f)) continue;
if (buildVariant != i.buildVariant) continue;
return &i;
}
return nullptr;
}
LLModel *LLModel::construct(const std::string &modelPath, std::string buildVariant) {
if (!has_at_least_minimal_hardware())
return nullptr;
// Read magic
std::ifstream f(modelPath, std::ios::binary);
if (!f) return nullptr;
// Get correct implementation
const LLModel::Implementation* impl = nullptr;
#if defined(__APPLE__) && defined(__arm64__) // FIXME: See if metal works for intel macs
if (buildVariant == "auto") {
impl = implementation(f, "metal");
}
#endif
if (!impl) {
//TODO: Auto-detect CUDA/OpenCL
if (buildVariant == "auto") {
if (requires_avxonly()) {
buildVariant = "avxonly";
} else {
buildVariant = "default";
}
}
impl = implementation(f, buildVariant);
if (!impl) return nullptr;
}
f.close();
// Construct and return llmodel implementation
return impl->construct();
}
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void LLModel::setImplementationsSearchPath(const std::string& path) {
s_implementations_search_path = path;
}
const std::string& LLModel::implementationsSearchPath() {
return s_implementations_search_path;
}