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import * as webllm from "https://esm.run/@mlc-ai/web-llm";
/*************** WebLLM logic ***************/
const messages = [
{
content: "You are a helpful AI agent helping users.",
role: "system",
},
];
const availableModels = webllm.prebuiltAppConfig.model_list.map(
(m) => m.model_id
);
let selectedModel = "Llama-3.1-8B-Instruct-q4f32_1-1k";
// Callback function for initializing progress
function updateEngineInitProgressCallback(report) {
console.log("initialize", report.progress);
document.getElementById("download-status").textContent = report.text;
}
// Create engine instance
let modelLoaded = false;
const engine = new webllm.MLCEngine();
engine.setInitProgressCallback(updateEngineInitProgressCallback);
async function initializeWebLLMEngine() {
document.getElementById("download-status").classList.remove("hidden");
selectedModel = document.getElementById("model-selection").value;
const config = {
temperature: 1.0,
top_p: 1,
};
await engine.reload(selectedModel, config);
modelLoaded = true;
}
async function streamingGenerating(messages, onUpdate, onFinish, onError) {
try {
let curMessage = "";
let usage;
const completion = await engine.chat.completions.create({
stream: true,
messages,
stream_options: { include_usage: true },
});
for await (const chunk of completion) {
const curDelta = chunk.choices[0]?.delta.content;
if (curDelta) {
curMessage += curDelta;
}
if (chunk.usage) {
usage = chunk.usage;
}
onUpdate(curMessage);
}
const finalMessage = await engine.getMessage();
onFinish(finalMessage, usage);
} catch (err) {
onError(err);
}
}
/*************** UI logic ***************/
function onMessageSend() {
if (!modelLoaded) {
return;
}
const input = document.getElementById("user-input").value.trim();
const message = {
content: input,
role: "user",
};
if (input.length === 0) {
return;
}
document.getElementById("send").disabled = true;
messages.push(message);
appendMessage(message);
document.getElementById("user-input").value = "";
document
.getElementById("user-input")
.setAttribute("placeholder", "Generating...");
const aiMessage = {
content: "typing...",
role: "assistant",
};
appendMessage(aiMessage);
const onFinishGenerating = (finalMessage, usage) => {
updateLastMessage(finalMessage);
document.getElementById("send").disabled = false;
const usageText =
`prompt_tokens: ${usage.prompt_tokens}, ` +
`completion_tokens: ${usage.completion_tokens}, ` +
`prefill: ${usage.extra.prefill_tokens_per_s.toFixed(4)} tokens/sec, ` +
`decoding: ${usage.extra.decode_tokens_per_s.toFixed(4)} tokens/sec`;
document.getElementById("chat-stats").classList.remove("hidden");
document.getElementById("chat-stats").textContent = usageText;
document
.getElementById("user-input")
.setAttribute("placeholder", "Type a message...");
};
streamingGenerating(
messages,
updateLastMessage,
onFinishGenerating,
console.error
);
}
function appendMessage(message) {
const chatBox = document.getElementById("chat-box");
const container = document.createElement("div");
container.classList.add("message-container");
const newMessage = document.createElement("div");
newMessage.classList.add("message");
newMessage.textContent = message.content;
if (message.role === "user") {
container.classList.add("user");
} else {
container.classList.add("assistant");
}
container.appendChild(newMessage);
chatBox.appendChild(container);
chatBox.scrollTop = chatBox.scrollHeight; // Scroll to the latest message
}
function updateLastMessage(content) {
const messageDoms = document
.getElementById("chat-box")
.querySelectorAll(".message");
const lastMessageDom = messageDoms[messageDoms.length - 1];
lastMessageDom.textContent = content;
}
/*************** UI binding ***************/
availableModels.forEach((modelId) => {
const option = document.createElement("option");
option.value = modelId;
option.textContent = modelId;
document.getElementById("model-selection").appendChild(option);
});
document.getElementById("model-selection").value = selectedModel;
document.getElementById("download").addEventListener("click", function () {
initializeWebLLMEngine().then(() => {
document.getElementById("send").disabled = false;
});
});
document.getElementById("send").addEventListener("click", function () {
onMessageSend();
});
document.getElementById("user-input").addEventListener("keydown", (event) => {
if (event.key === "Enter") {
onMessageSend();
}
});
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