app.py

import gradio as gr
from transformers import pipeline, AutoTokenizer, BitsAndBytesConfig, AutoModelForCausalLM
import torch
import spaces

MODEL_PATH = "benhaotang/phi4-qwq-sky-t1"
MODEL_URL = f"https://huggingface.co/{MODEL_PATH}"

def load_model():
    bnb_config = BitsAndBytesConfig(
        load_in_8bit=False,
        llm_int8_enable_fp32_cpu_offload=True
    )
    
    model = AutoModelForCausalLM.from_pretrained(
        MODEL_PATH,
        device_map="auto",
        torch_dtype=torch.float16,
        offload_folder="offload_folder",
        quantization_config=bnb_config
    )
    
    tokenizer = AutoTokenizer.from_pretrained(MODEL_PATH)
    
    # Create pipeline
    pipe = pipeline(
        "text-generation",
        model=model,
        tokenizer=tokenizer,
        device_map="auto",
    )
    
    return pipe

pipe = load_model()

@spaces.GPU(duration=110)
def generate_response(prompt, max_length=1024):
    # Convert prompt into messages format
    messages = [
        {"role": "system", "content": "You are a helpful AI asistent. You always think step by step."},
        {"role": "user", "content": prompt}
    ]
    
    # Generate response using pipeline
    outputs = pipe(messages, max_new_tokens=max_length)
    
    # Extract the generated text
    response = outputs[0]["generated_text"]
    
    # Since pipeline returns the full conversation, we want to extract just the response
    # Split by the prompt and take the last part
    response_only = response.split(prompt)[-1].strip()
    
    return response_only

demo = gr.Interface(
    fn=generate_response,
    inputs=[
        gr.Textbox(
            label="Enter your question",
            placeholder="Ask me anything...",
            lines=5
        ),
    ],
    outputs=gr.Textbox(label="Response", lines=10),
    title="benhaotang/phi4-qwq-sky-t1",
    description=f""" To achieve CoT and science reasoning on small scale
    
Model: [benhaotang/phi4-qwq-sky-t1]({MODEL_URL})""",
    examples=[
        ["For a scalar field theory with interaction Lagrangian $\mathcal{L}_{int} = g\phi^3 + \lambda\phi^4$:\n 1.Enumerate all possible 1-loop Feynman diagrams contributing to a 2-to-2 scattering process\n2.For each diagram, write down its corresponding amplitude\n3. Provide Mathematica code to calculate these loop amplitudes\n Please explain your reasoning step by step."]
    ]
)

demo.launch()