import torch
from transformers import pipeline, SiglipModel, AutoProcessor
import numpy as np
import gradio as gr


clip_checkpoint = "laion/CLIP-ViT-H-14-laion2B-s32B-b79K"
clip_detector = pipeline(model=clip_checkpoint, task="zero-shot-image-classification")


def postprocess(output):
  return {out["label"]: float(out["score"]) for out in output}


def infer(image, candidate_labels):
  candidate_labels = [label.lstrip(" ") for label in candidate_labels.split(",")]
  clip_out = clip_detector(image, candidate_labels=candidate_labels)
  return postprocess(clip_out)

def update_top_classes(num_classes):
  return

with gr.Blocks() as demo:
  gr.Markdown("# Compare CLIP and SigLIP")
  gr.Markdown("Compare the performance of CLIP and SigLIP on zero-shot classification in this Space 👇")
  with gr.Row():
    with gr.Column():
        image_input = gr.Image(type="pil")
        text_input = gr.Textbox(label="Input a list of labels")
        slider = gr.Slider(minimum=3, maximum=20, step=1, value=3, label="Number of Top Classes")
        run_button = gr.Button("Run", visible=True)

    with gr.Column():
      clip_output = gr.Label(label = "CLIP Output", num_top_classes=3)
      
  examples = [["./baklava.jpg", "baklava, souffle, tiramisu"]]
  gr.Examples(
        examples = examples, 
        inputs=[image_input, text_input],
        outputs=[clip_output, 
                 ],
        fn=infer,
        cache_examples=True
    )
  slider.change(
        fn=update_top_classes,
        inputs=slider,
        outputs=clip_output,
        _js="(i) => ({ 'num_top_classes': i })"
    )
  run_button.click(fn=infer,
                    inputs=[image_input, text_input],
                    outputs=[clip_output, 
                             ])

demo.launch()