app.py

import os
import signal
import threading
import time
import subprocess
import asyncio

OLLAMA = os.path.expanduser("~/ollama")
process = None
OLLAMA_SERVICE_THREAD = None

if not os.path.exists(OLLAMA):
    subprocess.run("curl -L https://ollama.com/download/ollama-linux-amd64 -o ~/ollama", shell=True)
    os.chmod(OLLAMA, 0o755)

def ollama_service_thread():
    global process
    process = subprocess.Popen("~/ollama serve", shell=True, preexec_fn=os.setsid)
    process.wait()
    
def terminate():
    global process, OLLAMA_SERVICE_THREAD
    if process:
        os.killpg(os.getpgid(process.pid), signal.SIGTERM)
    if OLLAMA_SERVICE_THREAD:
        OLLAMA_SERVICE_THREAD.join()
    process = None
    OLLAMA_SERVICE_THREAD = None
    print("Ollama service stopped.")

# Uncomment and modify the model to what you want locally
# model = "moondream" 
# model = os.environ.get("MODEL")

# subprocess.run(f"~/ollama pull {model}", shell=True)

import ollama
import gradio as gr
from ollama import AsyncClient
client = AsyncClient(host='http://localhost:11434', timeout=120)

HF_TOKEN = os.environ.get("HF_TOKEN", None)

TITLE = "<h1><center>Ollama Chat</center></h1>"

DESCRIPTION = f"""
<center>
<p>Feel free to test models with ollama.
<br>
First run please type <em>/init</em> to launch process.
<br>
Type <em>/pull model_name</em> to pull model.
</p>
</center>
"""

INIT_SIGN = ""

def init():
    global OLLAMA_SERVICE_THREAD
    OLLAMA_SERVICE_THREAD = threading.Thread(target=ollama_service_thread)
    OLLAMA_SERVICE_THREAD.start()
    print("Giving ollama serve a moment")
    time.sleep(10)
    global INIT_SIGN
    INIT_SIGN = "FINISHED"

def ollama_func(command):
    if " " in command:
        c1, c2 = command.split(" ")
    else:
        c1 = command
        c2 = ""
    function_map = {
        "/init": init,
        "/pull": lambda: ollama.pull(c2),
        "/list": ollama.list,
        "/bye": terminate,
    }
    if c1 in function_map:
        function_map.get(c1)()
        return "Running..."
    else:
        return "No supported command."

def launch():
    global OLLAMA_SERVICE_THREAD
    OLLAMA_SERVICE_THREAD = threading.Thread(target=ollama_service_thread)
    OLLAMA_SERVICE_THREAD.start()


async def stream_chat(message: str, history: list, model: str, temperature: float, max_new_tokens: int, top_p: float, top_k: int, penalty: float):
    print(f"message: {message}")
    conversation = []
    for prompt, answer in history:
        conversation.extend([
            {"role": "user", "content": prompt}, 
            {"role": "assistant", "content": answer},
        ])
    conversation.append({"role": "user", "content": message})
                
    print(f"Conversation is -\n{conversation}")
    
    if message.startswith("/"):
        resp = ollama_func(message)
        yield resp
    else:
        if not INIT_SIGN:
            yield "Please initialize Ollama"
        else:
            if not process:
                launch()
                print("Giving ollama serve a moment")
                time.sleep(10)    

            buffer = ""
            async for part in await client.chat(
                model=model,
                stream=True,
                messages=conversation,
                keep_alive="60s",
                options={
                    'num_predict': max_new_tokens,
                    'temperature': temperature,
                    'top_p': top_p,
                    'top_k': top_k,
                    'repeat_penalty': penalty,
                    'low_vram': True,
                    },
                ):
                buffer += part['message']['content']
                yield buffer

chatbot = gr.Chatbot(height=600, placeholder=DESCRIPTION)

with gr.Blocks(theme="Nymbo/Nymbo_Theme") as demo:
    gr.HTML(TITLE)
    gr.ChatInterface(
        fn=stream_chat,
        chatbot=chatbot,
        fill_height=True,
        additional_inputs_accordion=gr.Accordion(label="⚙️ Parameters", open=False, render=False),
        additional_inputs=[
            gr.Textbox(
                value="qwen2:0.5b",
                label="Model",
                render=False,
            ),
            gr.Slider(
                minimum=0,
                maximum=1,
                step=0.1,
                value=0.8,
                label="Temperature",
                render=False,
            ),
            gr.Slider(
                minimum=128,
                maximum=2048,
                step=1,
                value=1024,
                label="Max New Tokens",
                render=False,
            ),
            gr.Slider(
                minimum=0.0,
                maximum=1.0,
                step=0.1,
                value=0.8,
                label="top_p",
                render=False,
            ),
            gr.Slider(
                minimum=1,
                maximum=20,
                step=1,
                value=20,
                label="top_k",
                render=False,
            ),
            gr.Slider(
                minimum=0.0,
                maximum=2.0,
                step=0.1,
                value=1.0,
                label="Repetition penalty",
                render=False,
            ),
        ],
        examples=[
            ["Help me study vocabulary: write a sentence for me to fill in the blank, and I'll try to pick the correct option."],
            ["What are 5 creative things I could do with my kids' art? I don't want to throw them away, but it's also so much clutter."],
            ["Tell me a random fun fact about the Roman Empire."],
            ["Show me a code snippet of a website's sticky header in CSS and JavaScript."],
        ],
        cache_examples=False,
    )


if __name__ == "__main__":
    demo.launch()