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import spaces
import torch
import re
import gradio as gr
from transformers import AutoTokenizer, AutoModelForCausalLM
from PIL import Image

if torch.cuda.is_available():
    device, dtype = "cuda", torch.float16
else:
    device, dtype = "cpu", torch.float32

model_id = "vikhyatk/moondream2"
revision = "2024-04-02"
tokenizer = AutoTokenizer.from_pretrained(model_id, revision=revision)
moondream = AutoModelForCausalLM.from_pretrained(
    model_id, trust_remote_code=True, revision=revision, torch_dtype=dtype
).to(device=device)
moondream.eval()

@spaces.GPU
def answer_questions(image_tuples, prompt_text):
    result = ""
    
    prompts = [p.strip() for p in prompt_text.split(',')]  # Splitting and cleaning prompts    
    image_embeds = [img[0] for img in image_tuples if img[0] is not None]  # Extracting images from tuples, ignoring None
    
    # Check if the lengths of image_embeds and prompts are equal
    if len(image_embeds) != len(prompts):
        return ("Error: The number of images input and prompts input (seperate by commas in input text field) must be the same.")
        
    answers = moondream.batch_answer(
        images=image_embeds,
        prompts=prompts,
        tokenizer=tokenizer,
    )
    
    for question, answer in zip(prompts, answers):
        result += (f"Q: {question}\nA: {answer}\n\n")
        
    return result

with gr.Blocks() as demo:
    gr.Markdown("# moondream2 unofficial batch processing demo")
    gr.Markdown("1. Select images\n2. Enter prompts (one prompt for each image provided) separated by commas. Ex: Describe this image, What is in this image?\n\n")
    gr.Markdown("*Tested and Running on free CPU space tier currently so results may take a bit to process compared to using GPU space hardware*")
    gr.Markdown("## πŸŒ” moondream2\nA tiny vision language model. [GitHub](https://github.com/vikhyatk/moondream)")
    with gr.Row():
        img = gr.Gallery(label="Upload Images", type="pil")
        prompt = gr.Textbox(label="Input Prompts", placeholder="Enter prompts (one prompt for each image provided) separated by commas. Ex: Describe this image, What is in this image?", lines=8)
        submit = gr.Button("Submit")
    output = gr.TextArea(label="Responses", lines=8)
    submit.click(answer_questions, [img, prompt], output)

demo.queue().launch()