app.py

import logging
import random
import warnings
import os
import gradio as gr
import numpy as np
import torch
from diffusers import FluxControlNetModel
from diffusers.pipelines import FluxControlNetPipeline
from gradio_imageslider import ImageSlider
from PIL import Image
from huggingface_hub import snapshot_download
import gc

# Force CPU usage
device = "cpu"
dtype = torch.float32

# Clear memory
gc.collect()
if torch.cuda.is_available():
    torch.cuda.empty_cache()

css = """
#col-container {
    margin: 0 auto;
    max-width: 512px;
}
"""

huggingface_token = os.getenv("HF_TOKEN")

# Minimal model configuration
model_config = {
    "low_cpu_mem_usage": True,
    "torch_dtype": dtype,
    "use_safetensors": True,
    "device_map": "cpu"
}

model_path = snapshot_download(
    repo_id="black-forest-labs/FLUX.1-dev",
    repo_type="model",
    ignore_patterns=["*.md", "*..gitattributes", "*.bin"],
    local_dir="FLUX.1-dev", 
    token=huggingface_token,
)

# Load models on CPU
controlnet = FluxControlNetModel.from_pretrained(
    "jasperai/Flux.1-dev-Controlnet-Upscaler",
    **model_config
)

pipe = FluxControlNetPipeline.from_pretrained(
    model_path,
    controlnet=controlnet,
    **model_config
)

# Enable optimizations
pipe.enable_attention_slicing(1)
pipe.enable_vae_slicing()

MAX_SEED = 1000000
MAX_PIXEL_BUDGET = 64 * 64  # Extremely reduced

def process_input(input_image, upscale_factor):
    input_image = input_image.convert('RGB')
    
    # Aggressive size reduction
    w, h = input_image.size
    max_size = int(np.sqrt(MAX_PIXEL_BUDGET))
    
    # Resize to very small size
    new_w = min(w, max_size)
    new_h = min(h, max_size)
    input_image = input_image.resize((new_w, new_h), Image.LANCZOS)
    
    # Ensure dimensions are multiples of 8
    w = new_w - new_w % 8
    h = new_h - new_h % 8
    
    return input_image.resize((w, h)), w, h

def infer(
    seed,
    randomize_seed,
    input_image,
    num_inference_steps,
    upscale_factor,
    controlnet_conditioning_scale,
    progress=gr.Progress(track_tqdm=True),
):
    try:
        gc.collect()
        
        if randomize_seed:
            seed = random.randint(0, MAX_SEED)
            
        input_image, w, h = process_input(input_image, upscale_factor)
        
        with torch.inference_mode():
            generator = torch.Generator().manual_seed(seed)
            image = pipe(
                prompt="",
                control_image=input_image,
                controlnet_conditioning_scale=controlnet_conditioning_scale,
                num_inference_steps=num_inference_steps,
                guidance_scale=1.5,
                height=h,
                width=w,
                generator=generator,
            ).images[0]
            
        gc.collect()
        
        return [input_image, image, seed]

    except Exception as e:
        gr.Error(f"Error: {str(e)}")
        return None

with gr.Blocks(theme="Yntec/HaleyCH_Theme_Orange", css=css) as demo:
    with gr.Row():
        run_button = gr.Button(value="Run")

    with gr.Row():
        with gr.Column(scale=4):
            input_im = gr.Image(label="Input Image", type="pil")
        with gr.Column(scale=1):
            num_inference_steps = gr.Slider(
                label="Steps",
                minimum=1,
                maximum=10,
                step=1,
                value=5,
            )
            upscale_factor = gr.Slider(
                label="Scale",
                minimum=1,
                maximum=1,
                step=1,
                value=1,
            )
            controlnet_conditioning_scale = gr.Slider(
                label="Control Scale",
                minimum=0.1,
                maximum=0.3,
                step=0.1,
                value=0.2,
            )
            seed = gr.Slider(
                label="Seed",
                minimum=0,
                maximum=MAX_SEED,
                step=1,
                value=42,
            )
            randomize_seed = gr.Checkbox(label="Random Seed", value=True)

    with gr.Row():
        result = ImageSlider(label="Result", type="pil", interactive=True)

    current_dir = os.path.dirname(os.path.abspath(__file__))
    
    examples = gr.Examples(
        examples=[
            [42, False, os.path.join(current_dir, "z1.webp"), 5, 1, 0.2],
            [42, False, os.path.join(current_dir, "z2.webp"), 5, 1, 0.2],
        ],
        inputs=[
            seed,
            randomize_seed,
            input_im,
            num_inference_steps,
            upscale_factor,
            controlnet_conditioning_scale,
        ],
        fn=infer,
        outputs=result,
        cache_examples=False,
    )

    gr.on(
        [run_button.click],
        fn=infer,
        inputs=[
            seed,
            randomize_seed,
            input_im,
            num_inference_steps,
            upscale_factor,
            controlnet_conditioning_scale,
        ],
        outputs=result,
        show_api=False,
    )

# Minimal launch configuration
demo.queue(max_size=1).launch(
    share=False,
    debug=True,
    show_error=True,
    max_threads=1,
    enable_queue=True,
    cache_examples=False,
    quiet=True,
)