import gc import time from threading import Lock import torch from DeepCache import DeepCacheSDHelper from diffusers import StableDiffusionImg2ImgPipeline, StableDiffusionPipeline from diffusers.models import AutoencoderKL, AutoencoderTiny from diffusers.models.attention_processor import AttnProcessor2_0, IPAdapterAttnProcessor2_0 from .config import Config from .logger import Logger from .upscaler import RealESRGAN class Loader: _instance = None _lock = Lock() def __new__(cls): with cls._lock: if cls._instance is None: cls._instance = super().__new__(cls) cls._instance.pipe = None cls._instance.model = None cls._instance.ip_adapter = None cls._instance.upscaler_2x = None cls._instance.upscaler_4x = None cls._instance.log = Logger("Loader") return cls._instance def _should_unload_deepcache(self, interval=1): has_deepcache = hasattr(self.pipe, "deepcache") if has_deepcache and interval == 1: return True if has_deepcache and self.pipe.deepcache.params["cache_interval"] != interval: return True return False def _should_unload_ip_adapter(self, model="", ip_adapter=""): # unload if model changed if self.model and self.model.lower() != model.lower(): return True if self.ip_adapter and not ip_adapter: return True return False def _should_unload_pipeline(self, kind="", model=""): if self.pipe is None: return False if self.model.lower() != model.lower(): return True if kind == "txt2img" and not isinstance(self.pipe, StableDiffusionPipeline): return True # txt2img -> img2img if kind == "img2img" and not isinstance(self.pipe, StableDiffusionImg2ImgPipeline): return True # img2img -> txt2img return False def _unload_deepcache(self): if self.pipe.deepcache is None: return self.log.info("Unloading DeepCache") self.pipe.deepcache.disable() delattr(self.pipe, "deepcache") # https://github.com/huggingface/diffusers/blob/v0.28.0/src/diffusers/loaders/ip_adapter.py#L300 def _unload_ip_adapter(self): if self.ip_adapter is None: return self.log.info("Unloading IP-Adapter") if not isinstance(self.pipe, StableDiffusionImg2ImgPipeline): self.pipe.image_encoder = None self.pipe.register_to_config(image_encoder=[None, None]) self.pipe.feature_extractor = None self.pipe.unet.encoder_hid_proj = None self.pipe.unet.config.encoder_hid_dim_type = None self.pipe.register_to_config(feature_extractor=[None, None]) attn_procs = {} for name, value in self.pipe.unet.attn_processors.items(): attn_processor_class = AttnProcessor2_0() # raises if not torch 2 attn_procs[name] = ( attn_processor_class if isinstance(value, IPAdapterAttnProcessor2_0) else value.__class__() ) self.pipe.unet.set_attn_processor(attn_procs) def _flush(self): gc.collect() torch.cuda.empty_cache() torch.cuda.ipc_collect() torch.cuda.reset_peak_memory_stats() torch.cuda.synchronize() def _unload(self, kind="", model="", ip_adapter="", deepcache=1): to_unload = [] if self._should_unload_deepcache(deepcache): self._unload_deepcache() if self._should_unload_ip_adapter(model, ip_adapter): self._unload_ip_adapter() to_unload.append("ip_adapter") if self._should_unload_pipeline(kind, model): to_unload.append("model") to_unload.append("pipe") for component in to_unload: delattr(self, component) self._flush() for component in to_unload: setattr(self, component, None) def _load_ip_adapter(self, ip_adapter=""): if not self.ip_adapter and ip_adapter: self.log.info(f"Loading IP-Adapter: {ip_adapter}") self.pipe.load_ip_adapter( "h94/IP-Adapter", subfolder="models", weight_name=f"ip-adapter-{ip_adapter}_sd15.safetensors", ) # 50% works the best self.pipe.set_ip_adapter_scale(0.5) self.ip_adapter = ip_adapter # upscalers don't need to be unloaded def _load_upscaler(self, scale=1): if scale == 2 and self.upscaler_2x is None: try: self.log.info("Loading 2x upscaler") self.upscaler_2x = RealESRGAN(2, "cuda") self.upscaler_2x.load_weights() except Exception as e: self.log.error(f"Error loading 2x upscaler: {e}") self.upscaler_2x = None if scale == 4 and self.upscaler_4x is None: try: self.log.info("Loading 4x upscaler") self.upscaler_4x = RealESRGAN(4, "cuda") self.upscaler_4x.load_weights() except Exception as e: self.log.error(f"Error loading 4x upscaler: {e}") self.upscaler_4x = None def _load_pipeline(self, kind, model, tqdm, **kwargs): pipeline = Config.PIPELINES[kind] if self.pipe is None: try: start = time.perf_counter() self.log.info(f"Loading {model}") self.model = model if model.lower() in Config.MODEL_CHECKPOINTS.keys(): self.pipe = pipeline.from_single_file( f"https://huggingface.co/{model}/{Config.MODEL_CHECKPOINTS[model.lower()]}", **kwargs, ).to("cuda") else: self.pipe = pipeline.from_pretrained(model, **kwargs).to("cuda") diff = time.perf_counter() - start self.log.info(f"Loading {model} done in {diff:.2f}s") except Exception as e: self.log.error(f"Error loading {model}: {e}") self.model = None self.pipe = None return if not isinstance(self.pipe, pipeline): self.pipe = pipeline.from_pipe(self.pipe).to("cuda") if self.pipe is not None: self.pipe.set_progress_bar_config(disable=not tqdm) def _load_vae(self, taesd=False, model=""): vae_type = type(self.pipe.vae) is_kl = issubclass(vae_type, AutoencoderKL) is_tiny = issubclass(vae_type, AutoencoderTiny) # by default all models use KL if is_kl and taesd: self.log.info("Switching to Tiny VAE") self.pipe.vae = AutoencoderTiny.from_pretrained( pretrained_model_name_or_path="madebyollin/taesd", torch_dtype=self.pipe.dtype, ).to(self.pipe.device) return if is_tiny and not taesd: self.log.info("Switching to KL VAE") if model.lower() in Config.MODEL_CHECKPOINTS.keys(): self.pipe.vae = AutoencoderKL.from_single_file( f"https://huggingface.co/{model}/{Config.MODEL_CHECKPOINTS[model.lower()]}", torch_dtype=self.pipe.dtype, ).to(self.pipe.device) else: self.pipe.vae = AutoencoderKL.from_pretrained( pretrained_model_name_or_path=model, torch_dtype=self.pipe.dtype, subfolder="vae", variant="fp16", ).to(self.pipe.device) def _load_deepcache(self, interval=1): has_deepcache = hasattr(self.pipe, "deepcache") if not has_deepcache and interval == 1: return if has_deepcache and self.pipe.deepcache.params["cache_interval"] == interval: return self.log.info("Loading DeepCache") self.pipe.deepcache = DeepCacheSDHelper(self.pipe) self.pipe.deepcache.set_params(cache_interval=interval) self.pipe.deepcache.enable() # https://github.com/ChenyangSi/FreeU def _load_freeu(self, freeu=False): block = self.pipe.unet.up_blocks[0] attrs = ["b1", "b2", "s1", "s2"] has_freeu = all(getattr(block, attr, None) is not None for attr in attrs) if has_freeu and not freeu: self.log.info("Disabling FreeU") self.pipe.disable_freeu() elif not has_freeu and freeu: self.log.info("Enabling FreeU") self.pipe.enable_freeu(b1=1.5, b2=1.6, s1=0.9, s2=0.2) def load( self, kind, ip_adapter, model, scheduler, karras, taesd, freeu, deepcache, scale, tqdm, ): device = torch.device("cuda" if torch.cuda.is_available() else "cpu") scheduler_kwargs = { "beta_schedule": "scaled_linear", "timestep_spacing": "leading", "beta_start": 0.00085, "beta_end": 0.012, "steps_offset": 1, } if scheduler not in ["DDIM", "Euler a", "PNDM"]: scheduler_kwargs["use_karras_sigmas"] = karras # https://github.com/huggingface/diffusers/blob/8a3f0c1/scripts/convert_original_stable_diffusion_to_diffusers.py#L939 if scheduler == "DDIM": scheduler_kwargs["clip_sample"] = False scheduler_kwargs["set_alpha_to_one"] = False pipe_kwargs = { "safety_checker": None, "requires_safety_checker": False, "scheduler": Config.SCHEDULERS[scheduler](**scheduler_kwargs), } # diffusers fp16 variant if model.lower() not in Config.MODEL_CHECKPOINTS.keys(): pipe_kwargs["variant"] = "fp16" else: pipe_kwargs["variant"] = None # convert fp32 to bf16 if possible if model.lower() in ["linaqruf/anything-v3-1"]: pipe_kwargs["torch_dtype"] = ( torch.bfloat16 if torch.cuda.get_device_properties(device).major >= 8 else torch.float16 ) else: # defaults to float32 pipe_kwargs["torch_dtype"] = torch.float16 self._unload(kind, model, ip_adapter, deepcache) self._load_pipeline(kind, model, tqdm, **pipe_kwargs) # error loading model if self.pipe is None: return same_scheduler = isinstance(self.pipe.scheduler, Config.SCHEDULERS[scheduler]) same_karras = ( not hasattr(self.pipe.scheduler.config, "use_karras_sigmas") or self.pipe.scheduler.config.use_karras_sigmas == karras ) # same model, different scheduler if self.model.lower() == model.lower(): if not same_scheduler: self.log.info(f"Switching to {scheduler}") if not same_karras: self.log.info(f"{'Enabling' if karras else 'Disabling'} Karras sigmas") if not same_scheduler or not same_karras: self.pipe.scheduler = Config.SCHEDULERS[scheduler](**scheduler_kwargs) self._load_vae(taesd, model) self._load_upscaler(scale) self._load_freeu(freeu) self._load_deepcache(deepcache) self._load_ip_adapter(ip_adapter)