change tokenizer function to JS

sketch.js

@@ -22,26 +22,20 @@ async function textGenTask(input){
   const pipe = await pipeline('text-generation', MODEL)
   let tokenizer = AutoTokenizer.from_pretrained(MODEL)
 
-  // const messages = [
-  //     {"role": "system", "content": PREPROMPT},
-  //     {"role": "user", "content": input}
-  //   ]
-
   const messages = [
-    { "role": "system", "content": "You are pirate." },
-    { "role": "user", "content": input },
-  ]
+      {"role": "system", "content": PREPROMPT},
+      {"role": "user", "content": input}
+    ]
 
-  const prompt = pipe.tokenizer.apply_chat_template(messages, {
-    tokenize: false });
+  const prompt = tokenizer.apply_chat_template(messages, { tokenize: false });
 
   // run text through model, setting hyperparameters
-  var out = await pipe(input, {
+  var out = await pipe(prompt, {
     max_new_tokens: 256,
     temperature: 0.7,
     do_sample: true,
     top_k: 50,
-  })
+  }).apply_
 
   console.log(await out)
   console.log('text-gen task completed')