app.py

import os

import torch
import spaces
import safetensors
import gradio as gr
from PIL import Image
from loguru import logger
from torchvision import transforms
from huggingface_hub import hf_hub_download, login
from diffusers import FluxPipeline, FluxTransformer2DModel

from projection import ImageEncoder
from transformer_flux_custom import FluxTransformer2DModel as FluxTransformer2DModelWithIP


model_config = './config.json'
pretrained_model_name = 'black-forest-labs/FLUX.1-dev'
adapter_path = 'model.safetensors'
adapter_repo_id = "ashen0209/Flux-Consistancy-v2"

conditioner_base_model = 'eva02_large_patch14_448.mim_in22k_ft_in1k'
conditioner_layer_num = 12
device = "cuda" if torch.cuda.is_available() else "cpu"
output_dim = 4096
logger.info(f"pretrained_model_name: {pretrained_model_name}, adapter_repo_id: {adapter_repo_id}, adapter_path: {adapter_path}, conditioner_layer: {conditioner_layer_num}, output_dim {output_dim}, device: {device}")

logger.info("init model")
model = FluxTransformer2DModelWithIP.from_config(model_config, torch_dtype=torch.bfloat16) # type: ignore
logger.info("load model")
copy = FluxTransformer2DModel.from_pretrained(pretrained_model_name, subfolder='transformer', torch_dtype=torch.bfloat16)
model.load_state_dict(copy.state_dict(), strict=False)
del copy

logger.info("load proj")
extra_embedder = ImageEncoder(output_dim, layer_num=conditioner_layer_num, seq_len=2, device=device, base_model=conditioner_base_model, use_pyramid=True).to(device=device, dtype=torch.bfloat16)

logger.info("load pipe")
pipe = FluxPipeline.from_pretrained(pretrained_model_name, transformer=model, torch_dtype=torch.bfloat16)
pipe.to(dtype=torch.bfloat16, device=device)

logger.info("download adapter")
login(token=os.environ['HF_TOKEN'])
file_path = hf_hub_download(repo_id=adapter_repo_id, filename=adapter_path)

logger.info("load adapter")
state_dict = safetensors.torch.load_file(file_path)
state_dict = {'.'.join(k.split('.')[1:]): state_dict[k] for k in state_dict.keys()}
diff = model.load_state_dict(state_dict, strict=False)
diff = extra_embedder.load_state_dict(state_dict, strict=False)


IMAGE_PROCESS_TRANSFORM = transforms.Compose([
    transforms.Resize((448, 448)),
    transforms.ToTensor(),
    transforms.Normalize(mean=[0.4815, 0.4578, 0.4082], std=[0.2686, 0.2613, 0.276])
])

@spaces.GPU
def generate_image(ref_image, ref_image2=None, prompt="", height=512, width=512, num_steps=25, guidance_scale=3.5, seed=0, ip_scale=1.0):
    print(f"ref_image: {ref_image.size if ref_image is not None else None}, "
          f"ref_image2: {ref_image2.size if ref_image2 is not None else None}, "
          f"prompt: {prompt}, height: {height}, width: {width}, num_steps: {num_steps}, guidance_scale: {guidance_scale}, ip_scale: {ip_scale}")
    with torch.no_grad():
        image_refs = map(torch.stack, [
            [IMAGE_PROCESS_TRANSFORM(i) for i in [ref_image, ref_image2] if i is not None]
        ])    
        image_refs = [i.to(dtype=torch.bfloat16, device='cuda') for i in image_refs]
        prompt_embeds, pooled_prompt_embeds, txt_ids = pipe.encode_prompt(prompt, prompt)
        visual_prompt_embeds = extra_embedder(image_refs)
        prompt_embeds_with_ref = torch.cat([prompt_embeds, visual_prompt_embeds], dim=1)
        pipe.transformer.ip_scale = ip_scale
        image = pipe(
            prompt_embeds=prompt_embeds_with_ref,
            pooled_prompt_embeds=pooled_prompt_embeds,
            # negative_prompt_embeds=negative_prompt_embeds,
            # negative_pooled_prompt_embeds=negative_pooled_prompt_embeds,
            height=height,
            width=width,
            num_inference_steps=num_steps,
            guidance_scale=guidance_scale,
        ).images[0]
        return image    



examples = [
    ["assets/ref_woman1.jpg", None, "A photo of the woman dancing in the desert, blue sky, cinematic studio photography of high-fidelity subject, natural lightning, insanely detailed and intricate.", 512, 768],
    ["assets/ref_man1.jpg", "assets/ref_woman1.jpg", "The man and woman are standing in a sunlit meadow. The man is taking photos of the woman as she poses with the bouquet", 512, 768],
    ["assets/ref_man2.jpg", "assets/ref_woman2.jpg", "The man and woman are standing next to a motorcycle on a deserted road. The woman is pointing at the map, while the man looks confused but intrigued.", 512, 768],
    ["assets/ref_man3.jpg", "assets/ref_woman3.jpg", "The man and woman are at a glamorous ballroom dance. The man is offering the woman a glass of champagne, while she fans herself gracefully.", 512, 768],

]

with gr.Blocks() as demo:
    # Top-level inputs that are always visible
    with gr.Row():
        gr.Markdown("""
## Character Consistancy Image Generation based on Flux
- The model can be downloaded at https://huggingface.co/ashen0209/Flux-Consistancy-v2
- The model is good at generating consistent images of human characters, capable of multi-subjects generation especisally on realistic scenes
""")

    with gr.Row():
        with gr.Column():
            with gr.Row():
                ref_image = gr.Image(type="pil", label="Upload Reference Subject Image", width=300)
                ref_image2 = gr.Image(type="pil", label="[Optional] complement image or additional image from different category", width=200)
            description = gr.Textbox(lines=2, placeholder="Describe the desired contents", label="Description Text")
            generate_btn = gr.Button("Generate Image")

            # Advanced options hidden inside an accordion (click to expand)
            with gr.Accordion("Advanced Options", open=False):
                height_slider = gr.Slider(minimum=256, maximum=1024, value=512, step=64, label="Height")
                width_slider = gr.Slider(minimum=256, maximum=1024, value=512, step=64, label="Width")
                steps_slider = gr.Slider(minimum=20, maximum=50, value=25, step=1, label="Number of Steps")
                guidance_slider = gr.Slider(minimum=1.0, maximum=8.0, value=3.5, step=0.1, label="Guidance Scale")
                ref_scale_slider = gr.Slider(minimum=0.0, maximum=2.0, value=1.0, step=0.1, label="Reference Image Scale")
    
        with gr.Column():
            output = gr.Image(type="pil", label="Generated Image", )
            # with gr.Row():
            # with gr.Group():
            #     with gr.Row(equal_height=True):
            #         with gr.Column(scale=1, min_width=50, ):
            #             randomize_checkbox = gr.Checkbox(label="Randomize Seed", value=True)
            #         with gr.Column(scale=3, min_width=100):
            #             seed_io = gr.Number(label="Seed (if not randomizing)", value=0, interactive=True, )

    with gr.Row():
        gr.Examples(
            label='Click on following examples to load and try',
            examples=examples,
            inputs=[ref_image, ref_image2, description, height_slider, width_slider],
            fn=generate_image,
            outputs=output,
            # example_labels=['Reference Subject', 'Additional Reference', 'Prompt', 'Height', 'Width'],
            cache_examples=True, 
            cache_mode='lazy' 
        )
    
    with gr.Row():
        gr.Markdown("""
### Tips:
- Images with human subjects tend to perform better than other categories.
- Images where the subject occupies most of the frame with a clean, uncluttered background yield improved results.
- Including multiple subjects of the same category may cause blending issues.
""")    
    # When the button is clicked, pass all inputs to generate_image
    generate_btn.click(
        fn=generate_image,
        inputs=[ref_image, ref_image2, description, height_slider, width_slider, steps_slider, guidance_slider, ref_scale_slider],
        outputs=output,
    )



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