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import os |
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from threading import Thread |
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from typing import Iterator |
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import gradio as gr |
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import spaces |
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import torch |
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from transformers import AutoModelForCausalLM, AutoTokenizer, TextIteratorStreamer |
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MAX_MAX_NEW_TOKENS = 2048 |
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DEFAULT_MAX_NEW_TOKENS = 1024 |
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MAX_INPUT_TOKEN_LENGTH = int(os.getenv("MAX_INPUT_TOKEN_LENGTH", "4096")) |
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model_id = "meta-llama/Llama-2-7b-chat-hf" |
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model = AutoModelForCausalLM.from_pretrained(model_id) |
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tokenizer = AutoTokenizer.from_pretrained(model_id) |
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tokenizer.use_default_system_prompt = False |
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def generate( |
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message: str, |
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chat_history: list[tuple[str, str]], |
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system_prompt: str, |
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max_new_tokens: int = 1024, |
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temperature: float = 0.6, |
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top_p: float = 0.9, |
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top_k: int = 50, |
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repetition_penalty: float = 1.2, |
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) -> str: |
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conversation = [] |
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if system_prompt: |
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conversation.append({"role": "system", "content": system_prompt}) |
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for user, assistant in chat_history: |
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conversation.extend([{"role": "user", "content": user}, {"role": "assistant", "content": assistant}]) |
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conversation.append({"role": "user", "content": message}) |
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input_ids = tokenizer.apply_chat_template(conversation, return_tensors="pt") |
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if input_ids.shape[1] > MAX_INPUT_TOKEN_LENGTH: |
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input_ids = input_ids[:, -MAX_INPUT_TOKEN_LENGTH:] |
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gr.Warning(f"Trimmed input from conversation as it was longer than {MAX_INPUT_TOKEN_LENGTH} tokens.") |
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input_ids = input_ids.to('cpu') |
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output = model.generate( |
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input_ids=input_ids, |
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max_length=len(tokenizer.encode(system_prompt)) + max_new_tokens, |
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temperature=temperature, |
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top_p=top_p, |
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top_k=top_k, |
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repetition_penalty=repetition_penalty, |
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pad_token_id=tokenizer.eos_token_id, |
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) |
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return tokenizer.decode(output[0], skip_special_tokens=True) |
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chat_interface = gr.ChatInterface( |
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fn=generate, |
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additional_inputs=[ |
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gr.Textbox(label="System prompt", lines=6), |
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gr.Slider( |
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label="Max new tokens", |
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minimum=1, |
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maximum=MAX_MAX_NEW_TOKENS, |
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step=1, |
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value=DEFAULT_MAX_NEW_TOKENS, |
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), |
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gr.Slider( |
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label="Temperature", |
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minimum=0.1, |
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maximum=4.0, |
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step=0.1, |
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value=0.6, |
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), |
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gr.Slider( |
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label="Top-p (nucleus sampling)", |
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minimum=0.05, |
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maximum=1.0, |
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step=0.05, |
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value=0.9, |
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), |
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gr.Slider( |
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label="Top-k", |
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minimum=1, |
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maximum=1000, |
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step=1, |
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value=50, |
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), |
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gr.Slider( |
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label="Repetition penalty", |
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minimum=1.0, |
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maximum=2.0, |
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step=0.05, |
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value=1.2, |
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), |
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], |
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stop_btn=None, |
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examples=[ |
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["Hello there! How are you doing?"], |
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["Can you explain briefly to me what is the Python programming language?"], |
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["Explain the plot of Cinderella in a sentence."], |
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["How many hours does it take a man to eat a Helicopter?"], |
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["Write a 100-word article on 'Benefits of Open-Source in AI research'"], |
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], |
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) |
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with gr.Blocks(css="style.css") as demo: |
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chat_interface.render() |
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if __name__ == "__main__": |
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demo.queue(max_size=20).launch(share=True, debug=True) |
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