chore(代码变更): 1. 清理无用代码 2. 更新依赖库 3. 优化项目结构 4. 修复小型bug 5. 增加注释以提高可读性
This commit is contained in:
@@ -0,0 +1,31 @@
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use burn::module::Module;
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use burn::record::{FullPrecisionSettings, NamedMpkFileRecorder};
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use burn::tensor::backend::Backend;
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use std::path::Path;
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use crate::loader::{load_into_model, TensorStore};
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use minicpm_core::config::LlamaConfig;
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use minicpm_core::model::LlamaForCausalLM;
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/// 导出全精度模型（f32）
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pub fn export<B: Backend>(
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store: &TensorStore,
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config: &LlamaConfig,
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output_dir: &Path,
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device: &B::Device,
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) -> anyhow::Result<()> {
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println!("创建模型结构...");
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let model = LlamaForCausalLM::<B>::new(config.clone(), device);
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println!("加载 safetensors 权重...");
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let model = load_into_model(model, store, device);
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println!("保存为 MPK 格式（全精度）...");
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std::fs::create_dir_all(output_dir)?;
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let output_path = output_dir.join("model");
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let recorder = NamedMpkFileRecorder::<FullPrecisionSettings>::new();
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model.save_file(&output_path, &recorder)?;
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println!("全精度模型已导出到: {:?}", output_dir);
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Ok(())
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}
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@@ -0,0 +1,44 @@
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pub mod full;
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/// 导出格式
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#[derive(Debug, Clone, Copy, PartialEq)]
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pub enum Format {
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/// 全精度 f32
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Full,
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}
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impl Format {
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pub fn name(&self) -> &'static str {
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match self {
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Format::Full => "全精度",
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}
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}
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pub fn dir_name(&self) -> &'static str {
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match self {
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Format::Full => "model",
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}
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}
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}
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/// 导出任务配置
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pub struct ExportTask {
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pub format: Format,
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pub output_dir: String,
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}
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impl ExportTask {
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pub fn new(format: Format) -> Self {
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Self {
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output_dir: format.dir_name().to_string(),
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format,
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}
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}
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pub fn with_dir(format: Format, output_dir: impl Into<String>) -> Self {
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Self {
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output_dir: output_dir.into(),
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format,
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}
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}
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}
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@@ -1,511 +1,46 @@
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use minicpm_core::config::LlamaConfig;
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use minicpm_core::model::LlamaForCausalLM;
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use burn::module::{Module, Param};
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use burn::nn::{EmbeddingRecord, LinearRecord};
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use burn::record::{FullPrecisionSettings, HalfPrecisionSettings, NamedMpkFileRecorder};
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pub mod format;
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pub mod loader;
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pub mod utils;
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pub use format::{ExportTask, Format};
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pub use loader::TensorStore;
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use burn::tensor::backend::Backend;
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use burn::tensor::{Float, Shape, Tensor, TensorData};
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use memmap2::Mmap;
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use std::collections::HashMap;
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use std::path::Path;
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pub fn export_model<B: Backend>(
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use minicpm_core::config::LlamaConfig;
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/// 执行导出任务
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pub fn run_export<B: Backend>(
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safetensors_path: &Path,
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config_path: &Path,
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tokenizer_path: &Path,
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output_dir: &Path,
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tasks: &[ExportTask],
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device: &B::Device,
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) -> anyhow::Result<()> {
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println!("开始转换 MiniCPM 模型为 Burn 格式...");
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println!("开始转换 MiniCPM 模型...");
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println!("源文件: {:?}", safetensors_path);
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println!("加载配置文件: {:?}", config_path);
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println!("加载配置文件...");
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let config = LlamaConfig::from_json(config_path.to_str().unwrap())?;
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println!("创建模型结构...");
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let model = LlamaForCausalLM::<B>::new(config, device);
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println!("解析 safetensors 文件...");
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let store = TensorStore::from_file(safetensors_path)?;
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println!("加载 safetensors 权重...");
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let model = load_safetensors(model, safetensors_path, device)?;
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for task in tasks {
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println!("\n--- 导出 {} ---", task.format.name());
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let output_dir = Path::new(&task.output_dir);
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println!("保存为 MPK 格式...");
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std::fs::create_dir_all(output_dir)?;
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let output_path = output_dir.join("model");
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let recorder = NamedMpkFileRecorder::<FullPrecisionSettings>::new();
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model.save_file(&output_path, &recorder)?;
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match task.format {
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Format::Full => {
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format::full::export::<B>(&store, &config, output_dir, device)?;
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}
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}
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println!("拷贝配置文件和 tokenizer...");
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std::fs::copy(config_path, output_dir.join("config.json"))?;
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std::fs::copy(tokenizer_path, output_dir.join("tokenizer.json"))?;
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std::fs::copy(config_path, output_dir.join("config.json"))?;
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std::fs::copy(tokenizer_path, output_dir.join("tokenizer.json"))?;
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}
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println!("模型已成功导出到: {:?}", output_dir);
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println!("\n所有导出任务完成！");
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Ok(())
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}
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/// 导出模型为半精度（f16），输出文件约为全精度的一半大小。
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pub fn export_model_half<B: Backend>(
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safetensors_path: &Path,
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config_path: &Path,
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tokenizer_path: &Path,
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output_dir: &Path,
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device: &B::Device,
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) -> anyhow::Result<()> {
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println!("开始转换 MiniCPM 模型为 Burn 格式（半精度 f16）...");
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println!("加载配置文件: {:?}", config_path);
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let config = LlamaConfig::from_json(config_path.to_str().unwrap())?;
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println!("创建模型结构...");
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let model = LlamaForCausalLM::<B>::new(config, device);
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println!("加载 safetensors 权重...");
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let model = load_safetensors(model, safetensors_path, device)?;
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println!("保存为半精度 MPK 格式...");
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std::fs::create_dir_all(output_dir)?;
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let output_path = output_dir.join("model");
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let recorder = NamedMpkFileRecorder::<HalfPrecisionSettings>::new();
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model.save_file(&output_path, &recorder)?;
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println!("拷贝配置文件和 tokenizer...");
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std::fs::copy(config_path, output_dir.join("config.json"))?;
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std::fs::copy(tokenizer_path, output_dir.join("tokenizer.json"))?;
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println!("半精度模型已成功导出到: {:?}", output_dir);
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Ok(())
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}
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pub fn load_safetensors<B: Backend>(
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model: LlamaForCausalLM<B>,
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path: &Path,
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device: &B::Device,
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) -> anyhow::Result<LlamaForCausalLM<B>> {
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let file = std::fs::File::open(path)?;
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let mmap = unsafe { Mmap::map(&file)? };
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let header_len = u64::from_le_bytes(mmap[..8].try_into().unwrap()) as usize;
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let header_bytes = &mmap[8..8 + header_len];
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let header: serde_json::Value = serde_json::from_slice(header_bytes)?;
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let mut tensors = HashMap::new();
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let mut shapes = HashMap::new();
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let mut dtypes = HashMap::new();
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let data_offset = 8 + header_len;
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if let Some(obj) = header.as_object() {
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for (name, info) in obj {
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if name == "__metadata__" {
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continue;
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}
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if let Some(info_obj) = info.as_object() {
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if let Some(offsets) = info_obj.get("data_offsets") {
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if let Some(arr) = offsets.as_array() {
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let start = arr[0].as_u64().unwrap() as usize;
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let end = arr[1].as_u64().unwrap() as usize;
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let data = &mmap[data_offset + start..data_offset + end];
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tensors.insert(name.clone(), data.to_vec());
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}
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}
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if let Some(shape) = info_obj.get("shape") {
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if let Some(arr) = shape.as_array() {
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let shape_vec: Vec<usize> = arr
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.iter()
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.map(|v| v.as_u64().unwrap() as usize)
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.collect();
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shapes.insert(name.clone(), shape_vec);
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}
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}
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if let Some(dtype) = info_obj.get("dtype") {
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if let Some(s) = dtype.as_str() {
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dtypes.insert(name.clone(), s.to_string());
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}
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}
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}
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}
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}
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let mut model = model;
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if let Some(weight) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, "model.embed_tokens.weight", device) {
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let record = EmbeddingRecord {
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weight: Param::from_tensor(weight),
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};
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model.model.embed_tokens = model.model.embed_tokens.clone().load_record(record);
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}
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for i in 0..model.config.num_hidden_layers {
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let prefix = format!("model.layers.{i}");
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if let Some(w) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.self_attn.q_proj.weight"), device) {
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let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
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model.model.layers[i].self_attn.q_proj = model.model.layers[i].self_attn.q_proj.clone().load_record(record);
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}
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if let Some(w) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.self_attn.k_proj.weight"), device) {
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let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
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model.model.layers[i].self_attn.k_proj = model.model.layers[i].self_attn.k_proj.clone().load_record(record);
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}
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if let Some(w) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.self_attn.v_proj.weight"), device) {
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let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
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model.model.layers[i].self_attn.v_proj = model.model.layers[i].self_attn.v_proj.clone().load_record(record);
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}
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if let Some(w) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.self_attn.o_proj.weight"), device) {
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let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
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model.model.layers[i].self_attn.o_proj = model.model.layers[i].self_attn.o_proj.clone().load_record(record);
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}
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if let Some(w) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.mlp.gate_proj.weight"), device) {
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let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
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model.model.layers[i].mlp.gate_proj = model.model.layers[i].mlp.gate_proj.clone().load_record(record);
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}
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if let Some(w) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.mlp.up_proj.weight"), device) {
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let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
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model.model.layers[i].mlp.up_proj = model.model.layers[i].mlp.up_proj.clone().load_record(record);
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}
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if let Some(w) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.mlp.down_proj.weight"), device) {
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let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
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model.model.layers[i].mlp.down_proj = model.model.layers[i].mlp.down_proj.clone().load_record(record);
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}
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if let Some(w) = load_tensor_1d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.input_layernorm.weight"), device) {
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model.model.layers[i].input_layernorm.weight = Param::from_tensor(w);
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}
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if let Some(w) = load_tensor_1d::<B>(&tensors, &shapes, &dtypes, &format!("{prefix}.post_attention_layernorm.weight"), device) {
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model.model.layers[i].post_attention_layernorm.weight = Param::from_tensor(w);
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}
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}
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if let Some(w) = load_tensor_1d::<B>(&tensors, &shapes, &dtypes, "model.norm.weight", device) {
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model.model.norm.weight = Param::from_tensor(w);
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}
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if let Some(w) = load_tensor_2d::<B>(&tensors, &shapes, &dtypes, "lm_head.weight", device) {
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let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
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model.lm_head = model.lm_head.clone().load_record(record);
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} else if model.config.tie_word_embeddings {
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let embed_weight = model.model.embed_tokens.weight.val();
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let record = LinearRecord { weight: Param::from_tensor(embed_weight.transpose()), bias: None };
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model.lm_head = model.lm_head.clone().load_record(record);
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}
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Ok(model)
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}
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fn load_tensor_2d<B: Backend>(
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tensors: &HashMap<String, Vec<u8>>,
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shapes: &HashMap<String, Vec<usize>>,
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dtypes: &HashMap<String, String>,
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name: &str,
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device: &B::Device,
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) -> Option<Tensor<B, 2, Float>> {
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let data = tensors.get(name)?;
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let shape = shapes.get(name)?;
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let dtype = dtypes.get(name)?;
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assert_eq!(shape.len(), 2, "Expected 2D tensor for {name}");
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let f32_data = convert_to_f32(data, dtype);
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let shape_arr: [usize; 2] = [shape[0], shape[1]];
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let tensor_data = TensorData::new(f32_data, Shape::new(shape_arr));
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Some(Tensor::from_data(tensor_data, device))
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}
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fn load_tensor_1d<B: Backend>(
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tensors: &HashMap<String, Vec<u8>>,
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shapes: &HashMap<String, Vec<usize>>,
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dtypes: &HashMap<String, String>,
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name: &str,
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device: &B::Device,
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) -> Option<Tensor<B, 1, Float>> {
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let data = tensors.get(name)?;
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let shape = shapes.get(name)?;
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let dtype = dtypes.get(name)?;
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assert_eq!(shape.len(), 1, "Expected 1D tensor for {name}");
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let f32_data = convert_to_f32(data, dtype);
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let shape_arr: [usize; 1] = [shape[0]];
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let tensor_data = TensorData::new(f32_data, Shape::new(shape_arr));
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Some(Tensor::from_data(tensor_data, device))
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}
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fn convert_to_f32(data: &[u8], dtype: &str) -> Vec<f32> {
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match dtype {
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"BF16" => data
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.chunks_exact(2)
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.map(|chunk| {
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let bytes: [u8; 2] = chunk.try_into().unwrap();
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bf16_to_f32(u16::from_le_bytes(bytes))
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})
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.collect(),
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"F16" => data
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.chunks_exact(2)
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.map(|chunk| {
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let bytes: [u8; 2] = chunk.try_into().unwrap();
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f16_to_f32(u16::from_le_bytes(bytes))
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})
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.collect(),
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"F32" => data
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.chunks_exact(4)
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.map(|chunk| {
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let bytes: [u8; 4] = chunk.try_into().unwrap();
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f32::from_le_bytes(bytes)
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})
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.collect(),
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_ => panic!("Unsupported dtype: {dtype}"),
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}
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}
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fn bf16_to_f32(bf16: u16) -> f32 {
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let f32_bits = (bf16 as u32) << 16;
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f32::from_bits(f32_bits)
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}
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fn f16_to_f32(f16: u16) -> f32 {
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let sign = (f16 >> 15) & 1;
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let exp = (f16 >> 10) & 0x1F;
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let mant = f16 & 0x3FF;
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if exp == 0 {
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if mant == 0 {
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return if sign == 0 { 0.0 } else { -0.0 };
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}
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let mut m = mant as u32;
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let mut e = 0u32;
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while (m & 0x400) == 0 {
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m <<= 1;
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e += 1;
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}
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m &= 0x3FF;
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let f32_exp = 127 - 14 - e;
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let f32_bits = ((sign as u32) << 31) | (f32_exp << 23) | ((m as u32) << 13);
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return f32::from_bits(f32_bits);
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}
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if exp == 0x1F {
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let f32_bits = ((sign as u32) << 31) | (0xFFu32 << 23) | ((mant as u32) << 13);
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return f32::from_bits(f32_bits);
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}
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let f32_exp = (exp as u32) + 127 - 15;
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let f32_bits = ((sign as u32) << 31) | (f32_exp << 23) | ((mant as u32) << 13);
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f32::from_bits(f32_bits)
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}
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// ==================== Q8 量化导出 ====================
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/// Q8 量化单个 f32 切片，返回 (scale, i8_data)
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||||
fn quantize_q8(f32_data: &[f32]) -> (f32, Vec<i8>) {
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let max_abs = f32_data
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.iter()
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||||
.map(|&x| x.abs())
|
||||
.fold(0.0f32, |a, b| a.max(b));
|
||||
let scale = if max_abs > 0.0 { max_abs / 127.0 } else { 1.0 };
|
||||
let q8: Vec<i8> = f32_data
|
||||
.iter()
|
||||
.map(|&x| (x / scale).round().clamp(-127.0, 127.0) as i8)
|
||||
.collect();
|
||||
(scale, q8)
|
||||
}
|
||||
|
||||
/// Q8 导出元数据中的 tensor 条目
|
||||
#[derive(serde::Serialize, serde::Deserialize)]
|
||||
struct Q8TensorMeta {
|
||||
shape: Vec<usize>,
|
||||
scale: f32,
|
||||
offset: u64,
|
||||
numel: usize,
|
||||
}
|
||||
|
||||
/// Q8 导出元数据
|
||||
#[derive(serde::Serialize, serde::Deserialize)]
|
||||
struct Q8Metadata {
|
||||
tensors: std::collections::HashMap<String, Q8TensorMeta>,
|
||||
}
|
||||
|
||||
/// 导出模型为 Q8 量化格式（INT8），输出 model.q8.json + model.q8.bin。
|
||||
/// 2D 权重（Linear/Embedding）量化为 INT8；1D norm 权重存为 F16。
|
||||
pub fn export_model_q8(
|
||||
safetensors_path: &Path,
|
||||
config_path: &Path,
|
||||
tokenizer_path: &Path,
|
||||
output_dir: &Path,
|
||||
) -> anyhow::Result<()> {
|
||||
println!("开始转换 MiniCPM 模型为 Q8 量化格式...");
|
||||
|
||||
println!("解析 safetensors 文件: {:?}", safetensors_path);
|
||||
let file = std::fs::File::open(safetensors_path)?;
|
||||
let mmap = unsafe { Mmap::map(&file)? };
|
||||
|
||||
let header_len = u64::from_le_bytes(mmap[..8].try_into().unwrap()) as usize;
|
||||
let header_bytes = &mmap[8..8 + header_len];
|
||||
let header: serde_json::Value = serde_json::from_slice(header_bytes)?;
|
||||
|
||||
let data_offset = 8 + header_len;
|
||||
|
||||
// 收集 tensor 信息
|
||||
let mut tensor_infos: Vec<(String, Vec<usize>, String, usize, usize)> = Vec::new();
|
||||
if let Some(obj) = header.as_object() {
|
||||
for (name, info) in obj {
|
||||
if name == "__metadata__" {
|
||||
continue;
|
||||
}
|
||||
if let Some(info_obj) = info.as_object() {
|
||||
let mut shape = Vec::new();
|
||||
if let Some(s) = info_obj.get("shape") {
|
||||
if let Some(arr) = s.as_array() {
|
||||
shape = arr.iter().map(|v| v.as_u64().unwrap() as usize).collect();
|
||||
}
|
||||
}
|
||||
let mut dtype = String::new();
|
||||
if let Some(d) = info_obj.get("dtype") {
|
||||
dtype = d.as_str().unwrap_or("").to_string();
|
||||
}
|
||||
let mut start = 0;
|
||||
let mut end = 0;
|
||||
if let Some(offsets) = info_obj.get("data_offsets") {
|
||||
if let Some(arr) = offsets.as_array() {
|
||||
start = arr[0].as_u64().unwrap() as usize;
|
||||
end = arr[1].as_u64().unwrap() as usize;
|
||||
}
|
||||
}
|
||||
tensor_infos.push((name.clone(), shape, dtype, start, end));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 定义需要量化的 2D 权重名称（与 load_safetensors 中的列表对应）
|
||||
let mut q8_tensors: Vec<String> = Vec::new();
|
||||
for i in 0..32 {
|
||||
let p = format!("model.layers.{i}");
|
||||
q8_tensors.push(format!("{p}.self_attn.q_proj.weight"));
|
||||
q8_tensors.push(format!("{p}.self_attn.k_proj.weight"));
|
||||
q8_tensors.push(format!("{p}.self_attn.v_proj.weight"));
|
||||
q8_tensors.push(format!("{p}.self_attn.o_proj.weight"));
|
||||
q8_tensors.push(format!("{p}.mlp.gate_proj.weight"));
|
||||
q8_tensors.push(format!("{p}.mlp.up_proj.weight"));
|
||||
q8_tensors.push(format!("{p}.mlp.down_proj.weight"));
|
||||
}
|
||||
q8_tensors.push("model.embed_tokens.weight".to_string());
|
||||
q8_tensors.push("lm_head.weight".to_string());
|
||||
|
||||
let q8_set: std::collections::HashSet<String> = q8_tensors.into_iter().collect();
|
||||
|
||||
std::fs::create_dir_all(output_dir)?;
|
||||
let json_path = output_dir.join("model.q8.json");
|
||||
let bin_path = output_dir.join("model.q8.bin");
|
||||
|
||||
let mut metadata: std::collections::HashMap<String, Q8TensorMeta> = std::collections::HashMap::new();
|
||||
let mut bin_file = std::fs::File::create(&bin_path)?;
|
||||
let mut current_offset: u64 = 0;
|
||||
|
||||
// 先处理 2D 权重：量化为 INT8
|
||||
for (name, shape, dtype, start, end) in &tensor_infos {
|
||||
if shape.len() != 2 {
|
||||
continue;
|
||||
}
|
||||
if !q8_set.contains(name.as_str()) {
|
||||
continue;
|
||||
}
|
||||
|
||||
println!("量化 2D 权重: {name} shape={shape:?} dtype={dtype}");
|
||||
let raw = &mmap[data_offset + *start..data_offset + *end];
|
||||
let f32_data = convert_to_f32(raw, dtype);
|
||||
let numel = f32_data.len();
|
||||
let (scale, q8_data) = quantize_q8(&f32_data);
|
||||
|
||||
// 写入 INT8 数据
|
||||
let bytes: &[u8] = unsafe {
|
||||
std::slice::from_raw_parts(q8_data.as_ptr() as *const u8, q8_data.len())
|
||||
};
|
||||
use std::io::Write;
|
||||
bin_file.write_all(bytes)?;
|
||||
|
||||
metadata.insert(
|
||||
name.clone(),
|
||||
Q8TensorMeta {
|
||||
shape: shape.clone(),
|
||||
scale,
|
||||
offset: current_offset,
|
||||
numel,
|
||||
},
|
||||
);
|
||||
current_offset += q8_data.len() as u64;
|
||||
}
|
||||
|
||||
// 再处理 1D norm 权重：存为 F16
|
||||
for (name, shape, dtype, start, end) in &tensor_infos {
|
||||
if shape.len() != 1 {
|
||||
continue;
|
||||
}
|
||||
let raw = &mmap[data_offset + *start..data_offset + *end];
|
||||
let f32_data = convert_to_f32(raw, dtype);
|
||||
let numel = f32_data.len();
|
||||
|
||||
// 转 F16 存储
|
||||
let mut f16_bytes = Vec::with_capacity(numel * 2);
|
||||
for &v in &f32_data {
|
||||
let f16_bits = f32_to_f16_bits(v);
|
||||
f16_bytes.extend_from_slice(&f16_bits.to_le_bytes());
|
||||
}
|
||||
|
||||
use std::io::Write;
|
||||
bin_file.write_all(&f16_bytes)?;
|
||||
|
||||
// 用负数 scale 表示 F16 类型（加载时 scale < 0 表示 F16）
|
||||
metadata.insert(
|
||||
name.clone(),
|
||||
Q8TensorMeta {
|
||||
shape: shape.clone(),
|
||||
scale: -1.0, // 标记为 F16
|
||||
offset: current_offset,
|
||||
numel,
|
||||
},
|
||||
);
|
||||
current_offset += f16_bytes.len() as u64;
|
||||
}
|
||||
|
||||
// 写 JSON 元数据
|
||||
let meta = Q8Metadata { tensors: metadata };
|
||||
let json_str = serde_json::to_string_pretty(&meta)?;
|
||||
std::fs::write(&json_path, json_str)?;
|
||||
|
||||
println!("拷贝配置文件和 tokenizer...");
|
||||
std::fs::copy(config_path, output_dir.join("config.json"))?;
|
||||
std::fs::copy(tokenizer_path, output_dir.join("tokenizer.json"))?;
|
||||
|
||||
println!("Q8 量化模型已导出到: {:?}", output_dir);
|
||||
println!(" - model.q8.json (元数据)",);
|
||||
println!(" - model.q8.bin (INT8 + F16 权重)",);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// f32 → f16 位表示（返回 u16）
|
||||
fn f32_to_f16_bits(v: f32) -> u16 {
|
||||
let bits = v.to_bits();
|
||||
let sign = bits >> 31;
|
||||
let exp = (bits >> 23) & 0xFF;
|
||||
let mant = bits & 0x7FFFFF;
|
||||
|
||||
let res: u32 = if exp == 0xFF {
|
||||
// NaN / Inf
|
||||
let f16_exp = 0x1F;
|
||||
let f16_mant = if mant == 0 { 0 } else { 0x3FF };
|
||||
(sign << 15) | (f16_exp << 10) | f16_mant
|
||||
} else if exp < 103 {
|
||||
// 下溢，返回 0
|
||||
0
|
||||
} else {
|
||||
let new_exp = (exp as i32) - 127 + 15;
|
||||
if new_exp >= 31 {
|
||||
// 上溢
|
||||
(sign << 15) | (0x1F << 10)
|
||||
} else if new_exp <= 0 {
|
||||
// 次正规数
|
||||
let mant_new = (mant | 0x800000) >> (113 - new_exp);
|
||||
(sign << 15) | (mant_new & 0x3FF)
|
||||
} else {
|
||||
let f16_mant = mant >> 13;
|
||||
(sign << 15) | ((new_exp as u32) << 10) | f16_mant
|
||||
}
|
||||
};
|
||||
res as u16
|
||||
}
|
||||
|
||||
@@ -0,0 +1,3 @@
|
||||
pub mod safetensors;
|
||||
|
||||
pub use safetensors::{load_into_model, TensorStore};
|
||||
@@ -0,0 +1,185 @@
|
||||
use burn::module::{Module, Param};
|
||||
use burn::nn::{EmbeddingRecord, LinearRecord};
|
||||
use burn::tensor::backend::Backend;
|
||||
use burn::tensor::{Float, Shape, Tensor, TensorData};
|
||||
use memmap2::Mmap;
|
||||
use std::collections::HashMap;
|
||||
use std::path::Path;
|
||||
|
||||
use crate::utils::convert_to_f32;
|
||||
use minicpm_core::model::LlamaForCausalLM;
|
||||
|
||||
/// 从 safetensors 文件解析出的张量数据
|
||||
pub struct TensorStore {
|
||||
tensors: HashMap<String, Vec<u8>>,
|
||||
shapes: HashMap<String, Vec<usize>>,
|
||||
dtypes: HashMap<String, String>,
|
||||
}
|
||||
|
||||
impl TensorStore {
|
||||
/// 从 safetensors 文件加载所有张量
|
||||
pub fn from_file(path: &Path) -> anyhow::Result<Self> {
|
||||
let file = std::fs::File::open(path)?;
|
||||
let mmap = unsafe { Mmap::map(&file)? };
|
||||
|
||||
let header_len = u64::from_le_bytes(mmap[..8].try_into().unwrap()) as usize;
|
||||
let header_bytes = &mmap[8..8 + header_len];
|
||||
let header: serde_json::Value = serde_json::from_slice(header_bytes)?;
|
||||
|
||||
let mut tensors = HashMap::new();
|
||||
let mut shapes = HashMap::new();
|
||||
let mut dtypes = HashMap::new();
|
||||
|
||||
let data_offset = 8 + header_len;
|
||||
|
||||
if let Some(obj) = header.as_object() {
|
||||
for (name, info) in obj {
|
||||
if name == "__metadata__" {
|
||||
continue;
|
||||
}
|
||||
if let Some(info_obj) = info.as_object() {
|
||||
if let Some(offsets) = info_obj.get("data_offsets") {
|
||||
if let Some(arr) = offsets.as_array() {
|
||||
let start = arr[0].as_u64().unwrap() as usize;
|
||||
let end = arr[1].as_u64().unwrap() as usize;
|
||||
let data = &mmap[data_offset + start..data_offset + end];
|
||||
tensors.insert(name.clone(), data.to_vec());
|
||||
}
|
||||
}
|
||||
if let Some(shape) = info_obj.get("shape") {
|
||||
if let Some(arr) = shape.as_array() {
|
||||
let shape_vec: Vec<usize> = arr
|
||||
.iter()
|
||||
.map(|v| v.as_u64().unwrap() as usize)
|
||||
.collect();
|
||||
shapes.insert(name.clone(), shape_vec);
|
||||
}
|
||||
}
|
||||
if let Some(dtype) = info_obj.get("dtype") {
|
||||
if let Some(s) = dtype.as_str() {
|
||||
dtypes.insert(name.clone(), s.to_string());
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(Self {
|
||||
tensors,
|
||||
shapes,
|
||||
dtypes,
|
||||
})
|
||||
}
|
||||
|
||||
/// 加载 2D 张量
|
||||
pub fn load_2d<B: Backend>(&self, name: &str, device: &B::Device) -> Option<Tensor<B, 2, Float>> {
|
||||
let data = self.tensors.get(name)?;
|
||||
let shape = self.shapes.get(name)?;
|
||||
let dtype = self.dtypes.get(name)?;
|
||||
|
||||
assert_eq!(shape.len(), 2, "期望 2D 张量: {name}");
|
||||
|
||||
let f32_data = convert_to_f32(data, dtype);
|
||||
let shape_arr: [usize; 2] = [shape[0], shape[1]];
|
||||
let tensor_data = TensorData::new(f32_data, Shape::new(shape_arr));
|
||||
Some(Tensor::from_data(tensor_data, device))
|
||||
}
|
||||
|
||||
/// 加载 1D 张量
|
||||
pub fn load_1d<B: Backend>(&self, name: &str, device: &B::Device) -> Option<Tensor<B, 1, Float>> {
|
||||
let data = self.tensors.get(name)?;
|
||||
let shape = self.shapes.get(name)?;
|
||||
let dtype = self.dtypes.get(name)?;
|
||||
|
||||
assert_eq!(shape.len(), 1, "期望 1D 张量: {name}");
|
||||
|
||||
let f32_data = convert_to_f32(data, dtype);
|
||||
let shape_arr: [usize; 1] = [shape[0]];
|
||||
let tensor_data = TensorData::new(f32_data, Shape::new(shape_arr));
|
||||
Some(Tensor::from_data(tensor_data, device))
|
||||
}
|
||||
|
||||
/// 获取原始字节数据
|
||||
pub fn raw(&self, name: &str) -> Option<&[u8]> {
|
||||
self.tensors.get(name).map(|v| v.as_slice())
|
||||
}
|
||||
|
||||
pub fn shape(&self, name: &str) -> Option<&Vec<usize>> {
|
||||
self.shapes.get(name)
|
||||
}
|
||||
|
||||
pub fn dtype(&self, name: &str) -> Option<&String> {
|
||||
self.dtypes.get(name)
|
||||
}
|
||||
|
||||
pub fn names(&self) -> impl Iterator<Item = &String> {
|
||||
self.tensors.keys()
|
||||
}
|
||||
}
|
||||
|
||||
/// 将 safetensors 权重加载到模型中
|
||||
pub fn load_into_model<B: Backend>(
|
||||
model: LlamaForCausalLM<B>,
|
||||
store: &TensorStore,
|
||||
device: &B::Device,
|
||||
) -> LlamaForCausalLM<B> {
|
||||
let mut model = model;
|
||||
|
||||
if let Some(w) = store.load_2d("model.embed_tokens.weight", device) {
|
||||
let record = EmbeddingRecord {
|
||||
weight: Param::from_tensor(w),
|
||||
};
|
||||
model.model.embed_tokens = model.model.embed_tokens.clone().load_record(record);
|
||||
}
|
||||
|
||||
for i in 0..model.config.num_hidden_layers {
|
||||
let prefix = format!("model.layers.{i}");
|
||||
|
||||
load_linear(&mut model, store, device, i, &format!("{prefix}.self_attn.q_proj.weight"), |m| &mut m.model.layers[i].self_attn.q_proj);
|
||||
load_linear(&mut model, store, device, i, &format!("{prefix}.self_attn.k_proj.weight"), |m| &mut m.model.layers[i].self_attn.k_proj);
|
||||
load_linear(&mut model, store, device, i, &format!("{prefix}.self_attn.v_proj.weight"), |m| &mut m.model.layers[i].self_attn.v_proj);
|
||||
load_linear(&mut model, store, device, i, &format!("{prefix}.self_attn.o_proj.weight"), |m| &mut m.model.layers[i].self_attn.o_proj);
|
||||
load_linear(&mut model, store, device, i, &format!("{prefix}.mlp.gate_proj.weight"), |m| &mut m.model.layers[i].mlp.gate_proj);
|
||||
load_linear(&mut model, store, device, i, &format!("{prefix}.mlp.up_proj.weight"), |m| &mut m.model.layers[i].mlp.up_proj);
|
||||
load_linear(&mut model, store, device, i, &format!("{prefix}.mlp.down_proj.weight"), |m| &mut m.model.layers[i].mlp.down_proj);
|
||||
|
||||
if let Some(w) = store.load_1d(&format!("{prefix}.input_layernorm.weight"), device) {
|
||||
model.model.layers[i].input_layernorm.weight = Param::from_tensor(w);
|
||||
}
|
||||
if let Some(w) = store.load_1d(&format!("{prefix}.post_attention_layernorm.weight"), device) {
|
||||
model.model.layers[i].post_attention_layernorm.weight = Param::from_tensor(w);
|
||||
}
|
||||
}
|
||||
|
||||
if let Some(w) = store.load_1d("model.norm.weight", device) {
|
||||
model.model.norm.weight = Param::from_tensor(w);
|
||||
}
|
||||
|
||||
if let Some(w) = store.load_2d("lm_head.weight", device) {
|
||||
let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
|
||||
model.lm_head = model.lm_head.clone().load_record(record);
|
||||
} else if model.config.tie_word_embeddings {
|
||||
let embed_weight = model.model.embed_tokens.weight.val();
|
||||
let record = LinearRecord { weight: Param::from_tensor(embed_weight.transpose()), bias: None };
|
||||
model.lm_head = model.lm_head.clone().load_record(record);
|
||||
}
|
||||
|
||||
model
|
||||
}
|
||||
|
||||
fn load_linear<B: Backend, F>(
|
||||
model: &mut LlamaForCausalLM<B>,
|
||||
store: &TensorStore,
|
||||
device: &B::Device,
|
||||
_layer_idx: usize,
|
||||
name: &str,
|
||||
get_field: F,
|
||||
) where
|
||||
F: FnOnce(&mut LlamaForCausalLM<B>) -> &mut burn::nn::Linear<B>,
|
||||
{
|
||||
if let Some(w) = store.load_2d(name, device) {
|
||||
let record = LinearRecord { weight: Param::from_tensor(w.transpose()), bias: None };
|
||||
let field = get_field(model);
|
||||
*field = field.clone().load_record(record);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,84 @@
|
||||
/// BF16 → F32
|
||||
pub fn bf16_to_f32(bf16: u16) -> f32 {
|
||||
let f32_bits = (bf16 as u32) << 16;
|
||||
f32::from_bits(f32_bits)
|
||||
}
|
||||
|
||||
/// F16 → F32
|
||||
pub fn f16_to_f32(f16: u16) -> f32 {
|
||||
let sign = (f16 >> 15) & 1;
|
||||
let exp = (f16 >> 10) & 0x1F;
|
||||
let mant = f16 & 0x3FF;
|
||||
|
||||
if exp == 0 {
|
||||
if mant == 0 {
|
||||
return if sign == 0 { 0.0 } else { -0.0 };
|
||||
}
|
||||
let mut m = mant as u32;
|
||||
let mut e = 0u32;
|
||||
while (m & 0x400) == 0 {
|
||||
m <<= 1;
|
||||
e += 1;
|
||||
}
|
||||
m &= 0x3FF;
|
||||
let f32_exp = 127 - 14 - e;
|
||||
let f32_bits = ((sign as u32) << 31) | (f32_exp << 23) | ((m as u32) << 13);
|
||||
return f32::from_bits(f32_bits);
|
||||
}
|
||||
|
||||
if exp == 0x1F {
|
||||
let f32_bits = ((sign as u32) << 31) | (0xFFu32 << 23) | ((mant as u32) << 13);
|
||||
return f32::from_bits(f32_bits);
|
||||
}
|
||||
|
||||
let f32_exp = (exp as u32) + 127 - 15;
|
||||
let f32_bits = ((sign as u32) << 31) | (f32_exp << 23) | ((mant as u32) << 13);
|
||||
f32::from_bits(f32_bits)
|
||||
}
|
||||
|
||||
/// F32 → F16 位表示
|
||||
pub fn f32_to_f16_bits(v: f32) -> u16 {
|
||||
let bits = v.to_bits();
|
||||
let sign = bits >> 31;
|
||||
let exp = (bits >> 23) & 0xFF;
|
||||
let mant = bits & 0x7FFFFF;
|
||||
|
||||
let res: u32 = if exp == 0xFF {
|
||||
let f16_exp = 0x1F;
|
||||
let f16_mant = if mant == 0 { 0 } else { 0x3FF };
|
||||
(sign << 15) | (f16_exp << 10) | f16_mant
|
||||
} else if exp < 103 {
|
||||
0
|
||||
} else {
|
||||
let new_exp = (exp as i32) - 127 + 15;
|
||||
if new_exp >= 31 {
|
||||
(sign << 15) | (0x1F << 10)
|
||||
} else if new_exp <= 0 {
|
||||
let mant_new = (mant | 0x800000) >> (113 - new_exp);
|
||||
(sign << 15) | (mant_new & 0x3FF)
|
||||
} else {
|
||||
let f16_mant = mant >> 13;
|
||||
(sign << 15) | ((new_exp as u32) << 10) | f16_mant
|
||||
}
|
||||
};
|
||||
res as u16
|
||||
}
|
||||
|
||||
/// 将原始字节按 dtype 转换为 f32 向量
|
||||
pub fn convert_to_f32(data: &[u8], dtype: &str) -> Vec<f32> {
|
||||
match dtype {
|
||||
"BF16" => data
|
||||
.chunks_exact(2)
|
||||
.map(|chunk| bf16_to_f32(u16::from_le_bytes(chunk.try_into().unwrap())))
|
||||
.collect(),
|
||||
"F16" => data
|
||||
.chunks_exact(2)
|
||||
.map(|chunk| f16_to_f32(u16::from_le_bytes(chunk.try_into().unwrap())))
|
||||
.collect(),
|
||||
"F32" => data
|
||||
.chunks_exact(4)
|
||||
.map(|chunk| f32::from_le_bytes(chunk.try_into().unwrap()))
|
||||
.collect(),
|
||||
_ => panic!("不支持的 dtype: {dtype}"),
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user