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| from __future__ import annotations | |
| import gc | |
| import pathlib | |
| import gradio as gr | |
| import PIL.Image | |
| import torch | |
| from diffusers import StableDiffusionXLPipeline | |
| from huggingface_hub import ModelCard | |
| from blora_utils import BLOCKS, filter_lora, scale_lora | |
| class InferencePipeline: | |
| def __init__(self, hf_token: str | None = None): | |
| self.hf_token = hf_token | |
| self.base_model_id = "stabilityai/stable-diffusion-xl-base-1.0" | |
| self.device = torch.device( | |
| 'cuda:0' if torch.cuda.is_available() else 'cpu') | |
| if self.device.type == 'cpu': | |
| self.pipe = StableDiffusionXLPipeline.from_pretrained( | |
| self.base_model_id, use_auth_token=self.hf_token, cache_dir='./cache') | |
| else: | |
| self.pipe = StableDiffusionXLPipeline.from_pretrained( | |
| self.base_model_id, | |
| torch_dtype=torch.float16, | |
| use_auth_token=self.hf_token) | |
| self.pipe = self.pipe.to(self.device) | |
| self.content_lora_model_id = None | |
| self.style_lora_model_id = None | |
| def clear(self) -> None: | |
| self.content_lora_model_id = None | |
| self.style_lora_model_id = None | |
| del self.pipe | |
| self.pipe = None | |
| torch.cuda.empty_cache() | |
| gc.collect() | |
| def load_b_lora_to_unet(self, content_lora_model_id: str, style_lora_model_id: str, content_alpha: float, | |
| style_alpha: float) -> None: | |
| try: | |
| # Get Content B-LoRA SD | |
| if content_lora_model_id: | |
| content_B_LoRA_sd, _ = self.pipe.lora_state_dict(content_lora_model_id, use_auth_token=self.hf_token) | |
| content_B_LoRA = filter_lora(content_B_LoRA_sd, BLOCKS['content']) | |
| content_B_LoRA = scale_lora(content_B_LoRA, content_alpha) | |
| else: | |
| content_B_LoRA = {} | |
| # Get Style B-LoRA SD | |
| if style_lora_model_id: | |
| style_B_LoRA_sd, _ = self.pipe.lora_state_dict(style_lora_model_id, use_auth_token=self.hf_token) | |
| style_B_LoRA = filter_lora(style_B_LoRA_sd, BLOCKS['style']) | |
| style_B_LoRA = scale_lora(style_B_LoRA, style_alpha) | |
| else: | |
| style_B_LoRA = {} | |
| # Merge B-LoRAs SD | |
| res_lora = {**content_B_LoRA, **style_B_LoRA} | |
| # Load | |
| self.pipe.load_lora_into_unet(res_lora, None, self.pipe.unet) | |
| except Exception as e: | |
| raise type(e)(f'failed to load_b_lora_to_unet, due to: {e}') | |
| def check_if_model_is_local(lora_model_id: str) -> bool: | |
| return pathlib.Path(lora_model_id).exists() | |
| def get_model_card(model_id: str, | |
| hf_token: str | None = None) -> ModelCard: | |
| if InferencePipeline.check_if_model_is_local(model_id): | |
| card_path = (pathlib.Path(model_id) / 'README.md').as_posix() | |
| else: | |
| card_path = model_id | |
| return ModelCard.load(card_path, token=hf_token) | |
| def get_base_model_info(lora_model_id: str, | |
| hf_token: str | None = None) -> str: | |
| card = InferencePipeline.get_model_card(lora_model_id, hf_token) | |
| return card.data.base_model | |
| def load_pipe(self, content_lora_model_id: str, style_lora_model_id: str, content_alpha: float, | |
| style_alpha: float) -> None: | |
| if content_lora_model_id == self.content_lora_model_id and style_lora_model_id == self.style_lora_model_id: | |
| return | |
| self.pipe.unload_lora_weights() | |
| self.load_b_lora_to_unet(content_lora_model_id, style_lora_model_id, content_alpha, style_alpha) | |
| self.content_lora_model_id = content_lora_model_id | |
| self.style_lora_model_id = style_lora_model_id | |
| def run( | |
| self, | |
| content_lora_model_id: str, | |
| style_lora_model_id: str, | |
| prompt: str, | |
| content_alpha: float, | |
| style_alpha: float, | |
| seed: int, | |
| n_steps: int, | |
| guidance_scale: float, | |
| ) -> PIL.Image.Image: | |
| if not torch.cuda.is_available(): | |
| raise gr.Error('CUDA is not available.') | |
| self.load_pipe(content_lora_model_id, style_lora_model_id, content_alpha, style_alpha) | |
| generator = torch.Generator(device=self.device).manual_seed(seed) | |
| out = self.pipe( | |
| prompt, | |
| num_inference_steps=n_steps, | |
| guidance_scale=guidance_scale, | |
| generator=generator, | |
| ) # type: ignore | |
| return out.images[0] | |