app.py

import gradio as gr
import spaces
from PIL import Image
import requests
from transformers import AutoModelForCausalLM, AutoProcessor
import torch

# Load the model and processor
model_id = "microsoft/Phi-3.5-vision-instruct"
model_revision = "f2a2b357af3e062d60ca6e73a13f9f97a7fd3524"  # Pin to a specific revision

model = AutoModelForCausalLM.from_pretrained(
    model_id,
    revision=model_revision,
    trust_remote_code=True,
    torch_dtype=torch.float16,
    use_flash_attention_2=False,  # Explicitly disable Flash Attention 2
)
processor = AutoProcessor.from_pretrained(model_id, revision=model_revision, trust_remote_code=True, num_crops=16)

@spaces.GPU(duration=120)  # Adjust the duration as needed
def solve_math_problem(image):
    # Move model to GPU for this function call
    model.to('cuda')
    
    # Prepare the input
    messages = [
        {"role": "user", "content": "<|image_1|>\nSolve this math problem step by step. Explain your reasoning clearly."},
    ]
    prompt = processor.tokenizer.apply_chat_template(
        messages,
        tokenize=False,
        add_generation_prompt=True
    )
    
    # Process the input
    inputs = processor(prompt, image, return_tensors="pt").to("cuda")
    
    # Generate the response
    generation_args = {
        "max_new_tokens": 1000,
        "temperature": 0.2,
        "do_sample": True,
    }
    generate_ids = model.generate(**inputs, 
        eos_token_id=processor.tokenizer.eos_token_id, 
        **generation_args
    )
    
    # Decode the response
    generate_ids = generate_ids[:, inputs['input_ids'].shape[1]:]
    response = processor.batch_decode(generate_ids, 
        skip_special_tokens=True, 
        clean_up_tokenization_spaces=False
    )[0]
    
    # Move model back to CPU to free up GPU memory
    model.to('cpu')
    
    return response

# Create the Gradio interface
iface = gr.Interface(
    fn=solve_math_problem,
    inputs=gr.Image(type="pil"),
    outputs="text",
    title="Visual Math Problem Solver",
    description="Upload an image of a math problem, and I'll try to solve it step by step!",
    examples=[
        ["example_math_problem1.jpg"],
        ["example_math_problem2.jpg"]
    ]
)

# Launch the app
iface.launch()