app.py

import gradio as gr
from PIL import Image
import os

# Diffusers
from diffusers import (
    FlaxControlNetModel,
    FlaxStableDiffusionControlNetPipeline
)
from diffusers.utils import load_image
# PyTorch
import torch
# Numpy
import numpy as np
# Jax
import jax
import jax.numpy as jnp
from jax import pmap
# Flax
import flax
from flax.jax_utils import replicate
from flax.training.common_utils import shard

os.environ["XLA_PYTHON_CLIENT_PREALLOCATE"]="false"

def create_key(seed=0):
    return jax.random.PRNGKey(seed)

# load control net and stable diffusion v1-5
controlnet, controlnet_params = FlaxControlNetModel.from_pretrained(
    "learner/jax-diffuser-event", from_flax=True, dtype=jnp.float32
)

pipe, params = FlaxStableDiffusionControlNetPipeline.from_pretrained(
    "runwayml/stable-diffusion-v1-5",
    controlnet=controlnet,
    from_pt=True,
    dtype=jnp.float32,
    #safety_checker=None,
)

# inference function takes prompt, negative prompt and image
def infer(prompts, negative_prompts, image):
    params["controlnet"] = controlnet_params

    num_samples = 1  # jax.device_count()
    rng = create_key(0)
    rng = jax.random.split(rng, jax.device_count())
    battlemap_image = Image.fromarray(image)

    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([battlemap_image] * num_samples) #battlemap_image

    p_params = replicate(params)
    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,
        # params = params,
        prng_seed=rng,
        num_inference_steps=50,
        neg_prompt_ids=negative_prompt_ids,
        jit=True,
    ).images

    output_image = pipe.numpy_to_pil(
        np.asarray(output.reshape((num_samples,) + output.shape[-3:]))
    )

    return output_image


title = "ControlNet + Stable Diffusion for Battlemaps"
description = """Sketch your game battlemap and add some prompts to let the magic happen 🪄.
Pretrained on battlemaps images. 
By Orgrim, Karm and Robin
"""
# you need to pass inputs and outputs according to inference function
gr.Interface(
    fn=infer,
    inputs=["text", "text", "image"],
    outputs="image",
    title=title,
    description=description,
).launch()