Fix the prompt for mistral when using instruct/interactive mode. (#1013)

candle-examples/examples/quantized/main.rs

@@ -50,6 +50,23 @@ enum Which {
     Mistral7bInstruct,
 }
 
+impl Which {
+    fn is_mistral(&self) -> bool {
+        match self {
+            Self::L7b
+            | Self::L13b
+            | Self::L70b
+            | Self::L7bChat
+            | Self::L13bChat
+            | Self::L70bChat
+            | Self::L7bCode
+            | Self::L13bCode
+            | Self::L34bCode => false,
+            Self::Mistral7b | Self::Mistral7bInstruct => true,
+        }
+    }
+}
+
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
 struct Args {
@@ -114,17 +131,10 @@ impl Args {
             Some(config) => std::path::PathBuf::from(config),
             None => {
                 let api = hf_hub::api::sync::Api::new()?;
-                let repo = match self.which {
-                    Which::L7b
-                    | Which::L13b
-                    | Which::L70b
-                    | Which::L7bCode
-                    | Which::L13bCode
-                    | Which::L34bCode
-                    | Which::L7bChat
-                    | Which::L13bChat
-                    | Which::L70bChat => "hf-internal-testing/llama-tokenizer",
-                    Which::Mistral7b | Which::Mistral7bInstruct => "mistralai/Mistral-7B-v0.1",
+                let repo = if self.which.is_mistral() {
+                    "mistralai/Mistral-7B-v0.1"
+                } else {
+                    "hf-internal-testing/llama-tokenizer"
                 };
                 let api = api.model(repo.to_string());
                 api.get("tokenizer.json")?
@@ -315,7 +325,11 @@ fn main() -> anyhow::Result<()> {
                         prompt.pop();
                     }
                 }
-                prompt
+                if args.which.is_mistral() {
+                    format!("[INST] {prompt} [/INST]")
+                } else {
+                    prompt
+                }
             }
         };
         print!("{}", &prompt_str);
@@ -351,6 +365,8 @@ fn main() -> anyhow::Result<()> {
         all_tokens.push(next_token);
         print_token(next_token, &tokenizer);
 
+        let eos_token = *tokenizer.get_vocab(true).get("</s>").unwrap();
+
         let start_post_prompt = std::time::Instant::now();
         for index in 0..to_sample {
             let input = Tensor::new(&[next_token], &Device::Cpu)?.unsqueeze(0)?;
@@ -369,6 +385,9 @@ fn main() -> anyhow::Result<()> {
             next_token = logits_processor.sample(&logits)?;
             all_tokens.push(next_token);
             print_token(next_token, &tokenizer);
+            if next_token == eos_token {
+                break;
+            };
         }
         let dt = start_post_prompt.elapsed();
         println!(