app.py

import gradio as gr
import numpy as np
import torch
import jax
import jax.numpy as jnp
from flax.jax_utils import replicate
from flax.training.common_utils import shard
from PIL import Image
from segment_anything import SamPredictor, sam_model_registry, SamAutomaticMaskGenerator
from diffusers import (
    UniPCMultistepScheduler,
    FlaxStableDiffusionControlNetPipeline,
    FlaxControlNetModel,
)

import colorsys

sam_checkpoint = "sam_vit_h_4b8939.pth"
model_type = "vit_h"
device = "cpu"


sam = sam_model_registry[model_type](checkpoint=sam_checkpoint)
sam.to(device=device)
predictor = SamPredictor(sam)
mask_generator = SamAutomaticMaskGenerator(sam)


controlnet, controlnet_params = FlaxControlNetModel.from_pretrained(
    "SAMControlNet/sd-controlnet-sam-seg", dtype=jnp.float32
)

pipe, params = FlaxStableDiffusionControlNetPipeline.from_pretrained(
    "runwayml/stable-diffusion-v1-5",
    controlnet=controlnet,
    revision="flax",
    dtype=jnp.bfloat16,
)

params["controlnet"] = controlnet_params
p_params = replicate(params)


with gr.Blocks() as demo:
    gr.Markdown("# WildSynth: Synthetic Wildlife Data Generation")
    gr.Markdown(
        """
        ### About
        We have trained a JAX ControlNet model for semantic segmentation on Wildlife Animal Images.
        
        For the training data creation we used the [Wildlife Animals Images](https://www.kaggle.com/datasets/anshulmehtakaggl/wildlife-animals-images) dataset.
        We created segmentation masks with the help of [Grounded SAM](https://github.com/IDEA-Research/Grounded-Segment-Anything) where we used the animals names 
        as input prompts for detection and more accurate segmentation.
        
        ### How To Use
        
    """
    )
    with gr.Row():
        input_img = gr.Image(label="Input")
        mask_img = gr.Image(label="Mask", interactive=False)
        output_img = gr.Image(label="Output", interactive=False)

    with gr.Row():
        prompt_text = gr.Textbox(lines=1, label="Prompt")
        negative_prompt_text = gr.Textbox(lines=1, label="Negative Prompt")

    with gr.Row():
        submit = gr.Button("Submit")
        clear = gr.Button("Clear")

    def generate_mask(image, evt: gr.SelectData):
        predictor.set_image(image)
        input_point = np.array([120, 21])
        input_label = np.ones(input_point.shape[0])
        mask, _, _ = predictor.predict(
            point_coords=input_point,
            point_labels=input_label,
            multimask_output=False,
        )

        # clear torch cache
        torch.cuda.empty_cache()
        mask = Image.fromarray(mask[0, :, :])
        segs = mask_generator.generate(image)
        boolean_masks = [s["segmentation"] for s in segs]
        finseg = np.zeros(
            (boolean_masks[0].shape[0], boolean_masks[0].shape[1], 3), dtype=np.uint8
        )
        # Loop over the boolean masks and assign a unique color to each class
        for class_id, boolean_mask in enumerate(boolean_masks):
            hue = class_id * 1.0 / len(boolean_masks)
            rgb = tuple(int(i * 255) for i in colorsys.hsv_to_rgb(hue, 1, 1))
            rgb_mask = np.zeros(
                (boolean_mask.shape[0], boolean_mask.shape[1], 3), dtype=np.uint8
            )
            rgb_mask[:, :, 0] = boolean_mask * rgb[0]
            rgb_mask[:, :, 1] = boolean_mask * rgb[1]
            rgb_mask[:, :, 2] = boolean_mask * rgb[2]
            finseg += rgb_mask

        torch.cuda.empty_cache()

        return mask, finseg

    def infer(
        image, prompts, negative_prompts, 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

    def _clear(sel_pix, img, mask, seg, out, prompt, neg_prompt, bg):
        img = None
        mask = None
        seg = None
        out = None
        prompt = ""
        neg_prompt = ""
        bg = False
        return img, mask, seg, out, prompt, neg_prompt, bg

    input_img.change(
        generate_mask,
        inputs=[input_img],
        outputs=[mask_img],
    )
    submit.click(
        infer,
        inputs=[mask_img, prompt_text, negative_prompt_text],
        outputs=[output_img],
    )
    clear.click(
        _clear,
        inputs=[
            input_img,
            mask_img,
            output_img,
            prompt_text,
            negative_prompt_text,
        ],
        outputs=[
            input_img,
            mask_img,
            output_img,
            prompt_text,
            negative_prompt_text,
        ],
    )

if __name__ == "__main__":
    demo.queue()
    demo.launch()