app.py

# app.py
from transformers import AutoTokenizer, AutoModelForCausalLM, TextIteratorStreamer
from threading import Thread
import gradio as gr
import torch

# load model and tokenizer
model_name = "inclusionAI/Ling-lite-1.5"
tokenizer = AutoTokenizer.from_pretrained(model_name)
model = AutoModelForCausalLM.from_pretrained(
    model_name,
    torch_dtype="auto",
    device_map="auto",
    trust_remote_code=True
).eval()

# define chat function
def chat(user_input, max_new_tokens=512):
    # chat history
    messages = [
        {"role": "system", "content": "You are Ling, an assistant created by inclusionAI"},
        {"role": "user", "content": user_input}
    ]
    prompt = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
    
    # encode the input prompt
    inputs = tokenizer(prompt, return_tensors="pt").to(model.device)

    #create streamer
    streamer = TextIteratorStreamer(tokenizer, skip_special_tokens=True)

    def generate():
        model.generate(**inputs, max_new_tokens=max_new_tokens, streamer=streamer)

    thread = Thread(target=generate)
    thread.start()

    prompt_len = len(prompt)
    generated_text = ""
    for new_text in streamer:
        generated_text += new_text
        yield generated_text
        #yield generated_text[prompt_len:]

    thread.join()

# Construct Gradio Interface
interface = gr.Interface(
    fn=chat,
    inputs=[
        gr.Textbox(lines=8, label="输入你的问题"),
        gr.Slider(minimum=100, maximum=1024, step=50, label="生成长度")
    ],
    outputs=[
        gr.Textbox(lines=8, label="模型回复")
    ],
    title="Ling-lite-1.5 AI助手",
    description="基于 [inclusionAI/Ling-lite-1.5](https://huggingface.co/inclusionAI/Ling-lite-1.5)  的对话式文本生成演示。",
    examples=[
        ["介绍大型语言模型的基本概念", 512],
        ["如何解决数学问题中的长上下文依赖？", 768]
    ]
)

# launch Gradion Service
interface.launch()