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Add llama2.c as an example. (#229)
* Start adding llama2.c. * Model loading. * Add the llama-v2 model. * Start converting the weights. * Rotary embedding tweaks. * Get the model to generate some tokens.
This commit is contained in:
Laurent Mazare
240
candle-examples/examples/llama2-c/main.rs
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240
candle-examples/examples/llama2-c/main.rs
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// https://github.com/karpathy/llama2.c
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#![allow(dead_code)]
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#![allow(unused)]
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#[cfg(feature = "mkl")]
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extern crate intel_mkl_src;
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mod model;
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use clap::Parser;
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use anyhow::Result;
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use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
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use candle::{DType, Device, Error, IndexOp, Layout, Shape, Tensor};
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use candle_nn::{Embedding, Linear, VarBuilder};
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use candle_transformers::generation::LogitsProcessor;
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use model::{Config, Llama};
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struct TransformerWeights {
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// token embedding table
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token_embedding_table: Tensor, // (vocab_size, dim)
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// weights for rmsnorms
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rms_att_weight: Tensor, // (layer, dim) rmsnorm weights
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rms_ffn_weight: Tensor, // (layer, dim)
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// weights for matmuls
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wq: Tensor, // (layer, dim, dim)
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wk: Tensor, // (layer, dim, dim)
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wv: Tensor, // (layer, dim, dim)
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wo: Tensor, // (layer, dim, dim)
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// weights for ffn
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w1: Tensor, // (layer, hidden_dim, dim)
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w2: Tensor, // (layer, dim, hidden_dim)
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w3: Tensor, // (layer, hidden_dim, dim)
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// final rmsnorm
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rms_final_weight: Tensor, // (dim,)
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// freq_cis for RoPE relatively positional embeddings
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freq_cis_real: Tensor, // (seq_len, head_size/2)
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freq_cis_imag: Tensor, // (seq_len, head_size/2)
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}
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impl Config {
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fn read_i32<R: std::io::Read>(r: &mut R) -> Result<i32> {
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let mut buf = [0u8; 4];
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r.read_exact(&mut buf)?;
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Ok(i32::from_le_bytes(buf))
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}
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fn from_reader<R: std::io::Read>(r: &mut R) -> Result<Self> {
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let dim = Self::read_i32(r)? as usize;
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let hidden_dim = Self::read_i32(r)? as usize;
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let n_layers = Self::read_i32(r)? as usize;
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let n_heads = Self::read_i32(r)? as usize;
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let n_kv_heads = Self::read_i32(r)? as usize;
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let vocab_size = Self::read_i32(r)? as usize;
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let seq_len = Self::read_i32(r)? as usize;
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Ok(Self {
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dim,
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hidden_dim,
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n_layers,
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n_heads,
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n_kv_heads,
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vocab_size,
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seq_len,
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norm_eps: 1e-5,
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})
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}
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fn head_size(&self) -> usize {
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self.dim / self.n_heads
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}
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}
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impl TransformerWeights {
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fn read_tensor<R: std::io::Read, S: Into<Shape>>(
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r: &mut R,
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shape: S,
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dev: &Device,
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) -> Result<Tensor> {
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let shape = shape.into();
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let mut data_t = vec![0f32; shape.elem_count()];
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r.read_f32_into::<LittleEndian>(&mut data_t)?;
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let tensor = Tensor::from_vec(data_t, shape, dev)?;
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Ok(tensor)
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}
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fn from_reader<R: std::io::Read>(r: &mut R, c: &Config, dev: &Device) -> Result<Self> {
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let token_embedding_table = Self::read_tensor(r, (c.vocab_size, c.dim), dev)?;
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let rms_att_weight = Self::read_tensor(r, (c.n_layers, c.dim), dev)?;
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let wq = Self::read_tensor(r, (c.n_layers, c.dim, c.dim), dev)?;
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let wk = Self::read_tensor(r, (c.n_layers, c.dim, c.dim), dev)?;
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let wv = Self::read_tensor(r, (c.n_layers, c.dim, c.dim), dev)?;
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let wo = Self::read_tensor(r, (c.n_layers, c.dim, c.dim), dev)?;
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let rms_ffn_weight = Self::read_tensor(r, (c.n_layers, c.dim), dev)?;
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let w1 = Self::read_tensor(r, (c.n_layers, c.hidden_dim, c.dim), dev)?;
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let w2 = Self::read_tensor(r, (c.n_layers, c.dim, c.hidden_dim), dev)?;
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let w3 = Self::read_tensor(r, (c.n_layers, c.hidden_dim, c.dim), dev)?;
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let rms_final_weight = Self::read_tensor(r, c.dim, dev)?;
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let head_size = c.head_size();
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let freq_cis_real = Self::read_tensor(r, (c.seq_len, head_size / 2), dev)?;
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let freq_cis_imag = Self::read_tensor(r, (c.seq_len, head_size / 2), dev)?;
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Ok(Self {
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token_embedding_table,
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rms_att_weight,
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wq,
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wk,
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wv,
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wo,
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rms_ffn_weight,
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w1,
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w2,
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w3,
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rms_final_weight,
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freq_cis_real,
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freq_cis_imag,
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})
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}
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fn var_builder(&self, cfg: &Config, device: &Device) -> Result<VarBuilder> {
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let mut ws = std::collections::HashMap::new();
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let mut insert = |name: &str, t: Tensor| {
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ws.insert(name.to_string(), t);
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};
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insert("rot.freq_cis_real", self.freq_cis_real.clone());
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insert("rot.freq_cis_imag", self.freq_cis_imag.clone());
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insert(
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"model.embed_tokens.weight",
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self.token_embedding_table.clone(),
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);
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insert("lm_head.weight", self.token_embedding_table.clone());
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insert("model.norm.weight", self.rms_final_weight.clone());
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for layer in 0..cfg.n_layers {
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ws.insert(
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format!("model.layers.{layer}.self_attn.q_proj.weight"),
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self.wq.i(layer)?,
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);
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ws.insert(
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format!("model.layers.{layer}.self_attn.k_proj.weight"),
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self.wk.i(layer)?,
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);
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ws.insert(
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format!("model.layers.{layer}.self_attn.v_proj.weight"),
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self.wv.i(layer)?,
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);
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ws.insert(
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format!("model.layers.{layer}.self_attn.o_proj.weight"),
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self.wo.i(layer)?,
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);
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ws.insert(
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format!("model.layers.{layer}.mlp.gate_proj.weight"),
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self.w1.i(layer)?,
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);
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ws.insert(
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format!("model.layers.{layer}.mlp.down_proj.weight"),
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self.w2.i(layer)?,
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);
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ws.insert(
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format!("model.layers.{layer}.mlp.up_proj.weight"),
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self.w3.i(layer)?,
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);
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ws.insert(
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format!("model.layers.{layer}.input_layernorm.weight"),
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self.rms_att_weight.i(layer)?,
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);
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ws.insert(
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format!("model.layers.{layer}.post_attention_layernorm.weight"),
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self.rms_ffn_weight.i(layer)?,
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);
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}
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let vb = VarBuilder::from_tensors(ws, DType::F32, device);
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Ok(vb)
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}
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}
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#[derive(Parser, Debug)]
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#[command(author, version, about, long_about = None)]
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struct Args {
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/// Run on CPU rather than on GPU.
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#[arg(long)]
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cpu: bool,
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/// Config file in binary format.
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#[arg(long)]
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config: String,
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}
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fn main() -> anyhow::Result<()> {
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let args = Args::parse();
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let device = candle_examples::device(args.cpu)?;
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let t = Tensor::arange(0f32, 14f32, &device)?.reshape((2, 7))?;
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println!("{t}");
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let mut file = std::fs::File::open(&args.config)?;
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let config = Config::from_reader(&mut file)?;
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println!("config: {config:?}");
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let weights = TransformerWeights::from_reader(&mut file, &config, &device)?;
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let vb = weights.var_builder(&config, &device)?;
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let cache = model::Cache::new(true, &config, vb.pp("rot"))?;
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let model = Llama::load(vb, &cache, &config)?;
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println!("starting the inference loop");
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let mut logits_processor = LogitsProcessor::new(299792458, None);
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let mut new_tokens: Vec<u32> = vec![];
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let start_gen = std::time::Instant::now();
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let mut index_pos = 0;
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let mut tokens = vec![1u32];
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for index in 0..config.seq_len - 10 {
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let start_gen = std::time::Instant::now();
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let context_size = if cache.use_kv_cache && index > 0 {
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1
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} else {
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tokens.len()
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};
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let ctxt = &tokens[tokens.len().saturating_sub(context_size)..];
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let input = Tensor::new(ctxt, &device)?.unsqueeze(0)?;
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let logits = model.forward(&input, index_pos)?;
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let logits = logits.squeeze(0)?;
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index_pos += ctxt.len();
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let next_token = logits_processor.sample(&logits)?;
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tokens.push(next_token);
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new_tokens.push(next_token);
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println!("> {:?}", start_gen.elapsed());
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println!(
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"{} token: {} '{}'",
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index + 1,
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next_token,
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0,
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// tokenizer.decode(vec![next_token], true).map_err(E::msg)?
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);
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}
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let dt = start_gen.elapsed();
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println!(
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"{} tokens generated ({} token/s)\n----\n{}\n----",
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config.seq_len,
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config.seq_len as f64 / dt.as_secs_f64(),
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0,
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// tokenizer.decode(new_tokens, true).map_err(E::msg)?
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);
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Ok(())
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}
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