app.py

import gradio as gr
import jax
from PIL import Image
from flax.jax_utils import replicate
from flax.training.common_utils import shard
from diffusers import FlaxControlNetModel, FlaxStableDiffusionControlNetPipeline
from diffusers.utils import load_image
import jax.numpy as jnp
import numpy as np
import gc


controlnet, controlnet_params = FlaxControlNetModel.from_pretrained(
    "mfidabel/controlnet-segment-anything", dtype=jnp.float32
)

pipe, params = FlaxStableDiffusionControlNetPipeline.from_pretrained(
    "runwayml/stable-diffusion-v1-5", controlnet=controlnet, revision="flax", dtype=jnp.float32
)

# Add ControlNet params and Replicate
params["controlnet"] = controlnet_params
p_params = replicate(params)

# Description
title = "# 🧨 ControlNet on Segment Anything 🤗"
description = """This is a demo on 🧨 ControlNet based on Meta's [Segment Anything Model](https://segment-anything.com/).

                Upload a Segment Anything Segmentation Map, write a prompt, and generate images 🤗 This demo is still a Work in Progress, so don't expect it to work well for now !! 

                ⌛️ It takes about 30~ seconds to generate 4 samples, to get faster results, don't forget to reduce the Nº Samples to 1.
              """

about = """


        # 👨‍💻 About the model

        This model is based on the [ControlNet Model](https://huggingface.co/blog/controlnet), which allow us to generate Images using some sort of condition image. For this model, we selected the segmentation maps produced by Meta's new segmentation model called [Segment Anything Model](https://github.com/facebookresearch/segment-anything) as the condition image. We then trained the model to generate images based on the structure of the segmentation maps and the text prompts given.


        # 💾 About the dataset

        For the training, we generated a segmented dataset based on the [COYO-700M](https://huggingface.co/datasets/kakaobrain/coyo-700m) dataset. The dataset provided us with the images, and the text prompts. For the segmented images, we used [Segment Anything Model](https://github.com/facebookresearch/segment-anything). We then created 8k samples train our model on, which isn't a lot, but as a team, we have been very busy with many other responsibilities and time constraints, which made it challenging to dedicate a lot of time to generating a larger dataset.  Despite the constraints we faced, we have still managed to achieve some nice results 🙌

        You can check the generated datasets below ⬇️
        - [sam-coyo-2k](https://huggingface.co/datasets/mfidabel/sam-coyo-2k)
        - [sam-coyo-2.5k](https://huggingface.co/datasets/mfidabel/sam-coyo-2.5k)
        - [sam-coyo-3k](https://huggingface.co/datasets/mfidabel/sam-coyo-3k)

"""

examples = [["contemporary living room of a house", "low quality", "examples/condition_image_1.png"],
            ["new york buildings,  Vincent Van Gogh starry night ", "low quality, monochrome", "examples/condition_image_2.png"],
            ["contemporary living room,  high quality, 4k, realistic", "low quality, monochrome, low res", "examples/condition_image_3.png"],
            ["internal stairs of a japanese house", "low quality,  low res,  people, kids", "examples/condition_image_4.png"],
            ["a photo of a girl taking notes", "low quality,  low res,  painting", "examples/condition_image_5.png"],
            ["painting of an hot air ballon flying over a valley, The Great Wave off Kanagawa style, blue and white colors", "low quality,  low res", "examples/condition_image_6.png"],
            ["painting of families enjoying the sunset,  The Garden of Earthly Delights style,  joyful", "low quality,  low res", "examples/condition_image_7.png"]]

css = "h1 { text-align: center } .about { text-align: justify; padding-left: 10%; padding-right: 10%; }"

# Inference Function
def infer(prompts, negative_prompts, image, num_inference_steps = 50, seed = 4, num_samples = 4):
    try:
        rng = jax.random.PRNGKey(int(seed))
        num_inference_steps = int(num_inference_steps)
        image = Image.fromarray(image, mode="RGB")
        num_samples = max(jax.device_count(), int(num_samples))
        p_rng = jax.random.split(rng, jax.device_count())
        
        prompt_ids = pipe.prepare_text_inputs([prompts] * num_samples)
        negative_prompt_ids = pipe.prepare_text_inputs([negative_prompts] * num_samples)
        processed_image = pipe.prepare_image_inputs([image] * num_samples)
        
        prompt_ids = shard(prompt_ids)
        negative_prompt_ids = shard(negative_prompt_ids)
        processed_image = shard(processed_image)
        
        output = pipe(
            prompt_ids=prompt_ids,
            image=processed_image,
            params=p_params,
            prng_seed=p_rng,
            num_inference_steps=num_inference_steps,
            neg_prompt_ids=negative_prompt_ids,
            jit=True,
        ).images

        del negative_prompt_ids
        del processed_image
        del prompt_ids

        output = output.reshape((num_samples,) + output.shape[-3:])
        final_image = [np.array(x*255, dtype=np.uint8) for x in output]
        print(output.shape)
        del output
        
    except Exception as e:
        print("Error: " + str(e))
        final_image = [np.zeros((512, 512, 3), dtype=np.uint8)] * num_samples
    finally:
        gc.collect()
        return final_image
    

default_example = examples[2]

cond_img = gr.Image(label="Input", shape=(512, 512), value=default_example[2])\
                    .style(height=200)

output = gr.Gallery(label="Generated images")\
                    .style(height=200, rows=[2], columns=[1, 2], object_fit="contain")

prompt = gr.Textbox(lines=1, label="Prompt", value=default_example[0])
negative_prompt = gr.Textbox(lines=1, label="Negative Prompt", value=default_example[1])


with gr.Blocks(css=css) as demo:
    with gr.Row():
        with gr.Column():
            # Title
            gr.Markdown(title)
            # Description
            gr.Markdown(description)

        with gr.Column():
            # Examples
            gr.Markdown("Try some of the examples below ⬇️")
            gr.Examples(examples=examples,
                    inputs=[prompt, negative_prompt, cond_img],
                    outputs=output,
                    fn=infer,
                    examples_per_page=4)

    # Images
    with gr.Row(variant="panel"):
        with gr.Column(scale=2):
            cond_img.render()
        with gr.Column(scale=1):
            output.render()
        
    # Submit & Clear
    with gr.Row():
        with gr.Column():
            prompt.render()
            negative_prompt.render()

        with gr.Column():
            with gr.Accordion("Advanced options", open=False):
                num_steps = gr.Slider(10, 60, 50, step=1, label="Steps")
                seed = gr.Slider(0, 1024, 4, step=1, label="Seed")
                num_samples = gr.Slider(1, 4, 4, step=1, label="Nº Samples")
                
            submit = gr.Button("Generate")
            # TODO: Download Button

    with gr.Row():
        gr.Markdown(about, elem_classes="about")
    
    submit.click(infer, 
                 inputs=[prompt, negative_prompt, cond_img, num_steps, seed, num_samples],
                 outputs = output)
    
demo.queue()
demo.launch()