run.py

from huggingface_hub import InferenceClient
import gradio as gr

client = InferenceClient()

def respond(
    prompt: str,
    history,
):
    if not history:
        history = [{"role": "system", "content": "You are a friendly chatbot"}]
    history.append({"role": "user", "content": prompt})

    yield history

    response = {"role": "assistant", "content": ""}
    for message in client.chat_completion( # type: ignore
        history,
        temperature=0.95,
        top_p=0.9,
        max_tokens=512,
        stream=True,
        model="openai/gpt-oss-20b"
    ):
        response["content"] += message.choices[0].delta.content or "" if message.choices else ""
        yield history + [response]


def handle_undo(history, undo_data: gr.UndoData):
    return history[:undo_data.index], history[undo_data.index]['content'][0]["text"]

def handle_retry(history, retry_data: gr.RetryData):
    new_history = history[:retry_data.index]
    previous_prompt = history[retry_data.index]['content'][0]["text"]
    yield from respond(previous_prompt, new_history)


def handle_like(data: gr.LikeData):
    if data.liked:
        print("You upvoted this response: ", data.value)
    else:
        print("You downvoted this response: ", data.value)


with gr.Blocks() as demo:
    gr.Markdown("# Chat with GPT-OSS 20b 🤗")
    chatbot = gr.Chatbot(
        label="Agent",
        avatar_images=(
            None,
            "https://em-content.zobj.net/source/twitter/376/hugging-face_1f917.png",
        ),
    )
    prompt = gr.Textbox(max_lines=1, label="Chat Message")
    prompt.submit(respond, [prompt, chatbot], [chatbot])
    prompt.submit(lambda: "", None, [prompt])
    chatbot.undo(handle_undo, chatbot, [chatbot, prompt])
    chatbot.retry(handle_retry, chatbot, [chatbot])
    chatbot.like(handle_like, None, None)


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