Add some llama-3.2 examples. (#2508)

* Add some llama-3.2 examples.

* Support tie-word-embeddings for llama.

candle-examples/examples/llama/main.rs

@@ -35,6 +35,10 @@ enum Which {
     V31,
     V3Instruct,
     V31Instruct,
+    V32_1b,
+    V32_1bInstruct,
+    V32_3b,
+    V32_3bInstruct,
     #[value(name = "solar-10.7b")]
     Solar10_7B,
     #[value(name = "tiny-llama-1.1b-chat")]
@@ -137,6 +141,10 @@ fn main() -> Result<()> {
             Which::V3Instruct => "meta-llama/Meta-Llama-3-8B-Instruct".to_string(),
             Which::V31 => "meta-llama/Meta-Llama-3.1-8B".to_string(),
             Which::V31Instruct => "meta-llama/Meta-Llama-3.1-8B-Instruct".to_string(),
+            Which::V32_1b => "meta-llama/Llama-3.2-1B".to_string(),
+            Which::V32_1bInstruct => "meta-llama/Llama-3.2-1B-Instruct".to_string(),
+            Which::V32_3b => "meta-llama/Llama-3.2-3B".to_string(),
+            Which::V32_3bInstruct => "meta-llama/Llama-3.2-3B-Instruct".to_string(),
             Which::Solar10_7B => "upstage/SOLAR-10.7B-v1.0".to_string(),
             Which::TinyLlama1_1BChat => "TinyLlama/TinyLlama-1.1B-Chat-v1.0".to_string(),
         });
@@ -156,10 +164,14 @@ fn main() -> Result<()> {
             | Which::V3Instruct
             | Which::V31
             | Which::V31Instruct
+            | Which::V32_3b
+            | Which::V32_3bInstruct
             | Which::Solar10_7B => {
                 candle_examples::hub_load_safetensors(&api, "model.safetensors.index.json")?
             }
-            Which::TinyLlama1_1BChat => vec![api.get("model.safetensors")?],
+            Which::V32_1b | Which::V32_1bInstruct | Which::TinyLlama1_1BChat => {
+                vec![api.get("model.safetensors")?]
+            }
         };
         let cache = model::Cache::new(!args.no_kv_cache, dtype, &config, &device)?;
 

candle-transformers/src/models/llama.rs

@@ -44,6 +44,7 @@ pub struct LlamaConfig {
     pub eos_token_id: Option<LlamaEosToks>,
     pub rope_scaling: Option<Llama3RopeConfig>,
     pub max_position_embeddings: usize,
+    pub tie_word_embeddings: Option<bool>,
 }
 
 impl LlamaConfig {
@@ -72,6 +73,7 @@ impl LlamaConfig {
             eos_token_id: self.eos_token_id,
             rope_scaling: self.rope_scaling,
             max_position_embeddings: self.max_position_embeddings,
+            tie_word_embeddings: self.tie_word_embeddings.unwrap_or(false),
         }
     }
 }
@@ -91,6 +93,7 @@ pub struct Config {
     pub eos_token_id: Option<LlamaEosToks>,
     pub rope_scaling: Option<Llama3RopeConfig>,
     pub max_position_embeddings: usize,
+    pub tie_word_embeddings: bool,
 }
 
 impl Config {
@@ -109,6 +112,7 @@ impl Config {
             eos_token_id: None,
             rope_scaling: None,
             max_position_embeddings: DEFAULT_MAX_SEQ_LEN,
+            tie_word_embeddings: false,
         }
     }
 
@@ -127,6 +131,7 @@ impl Config {
             eos_token_id: None,
             rope_scaling: None,
             max_position_embeddings: DEFAULT_MAX_SEQ_LEN,
+            tie_word_embeddings: false,
         }
     }
 }
@@ -504,7 +509,11 @@ impl Llama {
 
     pub fn load(vb: VarBuilder, cfg: &Config) -> Result<Self> {
         let wte = embedding(cfg.vocab_size, cfg.hidden_size, vb.pp("model.embed_tokens"))?;
-        let lm_head = linear(cfg.hidden_size, cfg.vocab_size, vb.pp("lm_head"))?;
+        let lm_head = if cfg.tie_word_embeddings {
+            Linear::from_weights(wte.embeddings().clone(), None)
+        } else {
+            linear(cfg.hidden_size, cfg.vocab_size, vb.pp("lm_head"))?
+        };
         let ln_f = RmsNorm::new(cfg.hidden_size, cfg.rms_norm_eps, vb.pp("model.norm"))?;
         let blocks: Vec<_> = (0..cfg.num_hidden_layers)
             .map(|i| Block::load(vb.pp(format!("model.layers.{i}")), cfg).unwrap())

candle-transformers/src/models/llava/config.rs

@@ -43,6 +43,7 @@ pub struct LLaVAConfig {
     pub image_token_index: isize,
     #[serde(default = "default_hf")]
     pub hf: bool,
+    pub tie_word_embeddings: Option<bool>,
 }
 
 fn default_hf() -> bool {
@@ -77,6 +78,7 @@ impl LLaVAConfig {
             use_flash_attn: false,
             rope_scaling: None, // Assume we don't have LLaVA for Llama 3.1
             max_position_embeddings: self.max_position_embeddings,
+            tie_word_embeddings: self.tie_word_embeddings.unwrap_or(false),
         }
     }
 }
@@ -264,6 +266,7 @@ impl HFLLaVAConfig {
             use_cache: self.text_config.use_cache,
             vocab_size: self.vocab_size,
             image_token_index: self.image_token_index,
+            tie_word_embeddings: None,
         }
     }
 }