Move the weight bits in a separate module. (#295)

candle-examples/examples/llama2-c/main.rs

@@ -1,177 +1,21 @@
 // https://github.com/karpathy/llama2.c
-#![allow(dead_code)]
-#![allow(unused)]
 
 #[cfg(feature = "mkl")]
 extern crate intel_mkl_src;
 
 mod model;
+mod weights;
 use clap::{Parser, Subcommand};
 
 use anyhow::{Error as E, Result};
-use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
-use candle::{DType, Device, Error, IndexOp, Layout, Shape, Tensor};
-use candle_nn::{Embedding, Linear, VarBuilder};
+use byteorder::{LittleEndian, ReadBytesExt};
+use candle::{IndexOp, Tensor};
 use candle_transformers::generation::LogitsProcessor;
 use std::io::Write;
 use tokenizers::Tokenizer;
 
 use model::{Config, Llama};
-
-struct TransformerWeights {
-    // token embedding table
-    token_embedding_table: Tensor, // (vocab_size, dim)
-    // weights for rmsnorms
-    rms_att_weight: Tensor, // (layer, dim) rmsnorm weights
-    rms_ffn_weight: Tensor, // (layer, dim)
-    // weights for matmuls
-    wq: Tensor, // (layer, dim, dim)
-    wk: Tensor, // (layer, dim, dim)
-    wv: Tensor, // (layer, dim, dim)
-    wo: Tensor, // (layer, dim, dim)
-    // weights for ffn
-    w1: Tensor, // (layer, hidden_dim, dim)
-    w2: Tensor, // (layer, dim, hidden_dim)
-    w3: Tensor, // (layer, hidden_dim, dim)
-    // final rmsnorm
-    rms_final_weight: Tensor, // (dim,)
-    // freq_cis for RoPE relatively positional embeddings
-    freq_cis_real: Tensor, // (seq_len, head_size/2)
-    freq_cis_imag: Tensor, // (seq_len, head_size/2)
-}
-
-fn read_i32<R: std::io::Read>(r: &mut R) -> Result<i32> {
-    let mut buf = [0u8; 4];
-    r.read_exact(&mut buf)?;
-    Ok(i32::from_le_bytes(buf))
-}
-
-fn read_tensor<R: std::io::Read, S: Into<Shape>>(
-    r: &mut R,
-    shape: S,
-    dev: &Device,
-) -> Result<Tensor> {
-    let shape = shape.into();
-    let mut data_t = vec![0f32; shape.elem_count()];
-    r.read_f32_into::<LittleEndian>(&mut data_t)?;
-    let tensor = Tensor::from_vec(data_t, shape, dev)?;
-    Ok(tensor)
-}
-
-impl Config {
-    fn from_reader<R: std::io::Read>(r: &mut R) -> Result<Self> {
-        let dim = read_i32(r)? as usize;
-        let hidden_dim = read_i32(r)? as usize;
-        let n_layers = read_i32(r)? as usize;
-        let n_heads = read_i32(r)? as usize;
-        let n_kv_heads = read_i32(r)? as usize;
-        let vocab_size = read_i32(r)? as usize;
-        let seq_len = read_i32(r)? as usize;
-        Ok(Self {
-            dim,
-            hidden_dim,
-            n_layers,
-            n_heads,
-            n_kv_heads,
-            vocab_size,
-            seq_len,
-            norm_eps: 1e-5,
-        })
-    }
-
-    fn head_size(&self) -> usize {
-        self.dim / self.n_heads
-    }
-}
-
-impl TransformerWeights {
-    fn from_reader<R: std::io::Read>(r: &mut R, c: &Config, dev: &Device) -> Result<Self> {
-        let token_embedding_table = read_tensor(r, (c.vocab_size, c.dim), dev)?;
-        let rms_att_weight = read_tensor(r, (c.n_layers, c.dim), dev)?;
-        let wq = read_tensor(r, (c.n_layers, c.dim, c.dim), dev)?;
-        let wk = read_tensor(r, (c.n_layers, c.dim, c.dim), dev)?;
-        let wv = read_tensor(r, (c.n_layers, c.dim, c.dim), dev)?;
-        let wo = read_tensor(r, (c.n_layers, c.dim, c.dim), dev)?;
-        let rms_ffn_weight = read_tensor(r, (c.n_layers, c.dim), dev)?;
-        let w1 = read_tensor(r, (c.n_layers, c.hidden_dim, c.dim), dev)?;
-        let w2 = read_tensor(r, (c.n_layers, c.dim, c.hidden_dim), dev)?;
-        let w3 = read_tensor(r, (c.n_layers, c.hidden_dim, c.dim), dev)?;
-        let rms_final_weight = read_tensor(r, c.dim, dev)?;
-        let head_size = c.head_size();
-        let freq_cis_real = read_tensor(r, (c.seq_len, head_size / 2), dev)?;
-        let freq_cis_imag = read_tensor(r, (c.seq_len, head_size / 2), dev)?;
-        Ok(Self {
-            token_embedding_table,
-            rms_att_weight,
-            wq,
-            wk,
-            wv,
-            wo,
-            rms_ffn_weight,
-            w1,
-            w2,
-            w3,
-            rms_final_weight,
-            freq_cis_real,
-            freq_cis_imag,
-        })
-    }
-
-    fn var_builder(&self, cfg: &Config, device: &Device) -> Result<VarBuilder> {
-        let mut ws = std::collections::HashMap::new();
-        let mut insert = |name: &str, t: Tensor| {
-            ws.insert(name.to_string(), t);
-        };
-        insert("rot.freq_cis_real", self.freq_cis_real.clone());
-        insert("rot.freq_cis_imag", self.freq_cis_imag.clone());
-        insert(
-            "model.embed_tokens.weight",
-            self.token_embedding_table.clone(),
-        );
-        insert("lm_head.weight", self.token_embedding_table.clone());
-        insert("model.norm.weight", self.rms_final_weight.clone());
-        for layer in 0..cfg.n_layers {
-            ws.insert(
-                format!("model.layers.{layer}.self_attn.q_proj.weight"),
-                self.wq.i(layer)?,
-            );
-            ws.insert(
-                format!("model.layers.{layer}.self_attn.k_proj.weight"),
-                self.wk.i(layer)?,
-            );
-            ws.insert(
-                format!("model.layers.{layer}.self_attn.v_proj.weight"),
-                self.wv.i(layer)?,
-            );
-            ws.insert(
-                format!("model.layers.{layer}.self_attn.o_proj.weight"),
-                self.wo.i(layer)?,
-            );
-            ws.insert(
-                format!("model.layers.{layer}.mlp.gate_proj.weight"),
-                self.w1.i(layer)?,
-            );
-            ws.insert(
-                format!("model.layers.{layer}.mlp.down_proj.weight"),
-                self.w2.i(layer)?,
-            );
-            ws.insert(
-                format!("model.layers.{layer}.mlp.up_proj.weight"),
-                self.w3.i(layer)?,
-            );
-            ws.insert(
-                format!("model.layers.{layer}.input_layernorm.weight"),
-                self.rms_att_weight.i(layer)?,
-            );
-            ws.insert(
-                format!("model.layers.{layer}.post_attention_layernorm.weight"),
-                self.rms_ffn_weight.i(layer)?,
-            );
-        }
-        let vb = VarBuilder::from_tensors(ws, DType::F32, device);
-        Ok(vb)
-    }
-}
+use weights::TransformerWeights;
 
 #[derive(Parser, Debug, Clone)]
 struct InferenceCmd {
@@ -308,6 +152,8 @@ fn run_eval(args: &EvaluationCmd, common_args: &Args) -> Result<()> {
             tokens.concat()
         }
         Some(pretokenized_dir) => {
+            // Use shard 0 for the test split, similar to llama2.c
+            // https://github.com/karpathy/llama2.c/blob/ce05cc28cf1e3560b873bb21837638a434520a67/tinystories.py#L121
             let path = std::path::PathBuf::from(pretokenized_dir).join("data00.bin");
             let bytes = std::fs::read(path)?;
             // Tokens are encoded as u16.
@@ -377,7 +223,6 @@ fn run_inference(args: &InferenceCmd, common_args: &Args) -> Result<()> {
         if tokens.len() >= model.config.seq_len {
             break;
         }
-        let start_gen = std::time::Instant::now();
         let context_size = if index > 0 { 1 } else { tokens.len() };
         let ctxt = &tokens[tokens.len().saturating_sub(context_size)..];
         let input = Tensor::new(ctxt, &device)?.unsqueeze(0)?;