import torch import sd1_clip import sd2_clip import model_management from ldm.util import instantiate_from_config from ldm.models.autoencoder import AutoencoderKL from omegaconf import OmegaConf def load_torch_file(ckpt): if ckpt.lower().endswith(".safetensors"): import safetensors.torch sd = safetensors.torch.load_file(ckpt, device="cpu") else: pl_sd = torch.load(ckpt, map_location="cpu") if "global_step" in pl_sd: print(f"Global Step: {pl_sd['global_step']}") if "state_dict" in pl_sd: sd = pl_sd["state_dict"] else: sd = pl_sd return sd def load_model_from_config(config, ckpt, verbose=False, load_state_dict_to=[]): print(f"Loading model from {ckpt}") sd = load_torch_file(ckpt) model = instantiate_from_config(config.model) m, u = model.load_state_dict(sd, strict=False) k = list(sd.keys()) for x in k: # print(x) if x.startswith("cond_stage_model.transformer.") and not x.startswith("cond_stage_model.transformer.text_model."): y = x.replace("cond_stage_model.transformer.", "cond_stage_model.transformer.text_model.") sd[y] = sd.pop(x) if 'cond_stage_model.transformer.text_model.embeddings.position_ids' in sd: ids = sd['cond_stage_model.transformer.text_model.embeddings.position_ids'] if ids.dtype == torch.float32: sd['cond_stage_model.transformer.text_model.embeddings.position_ids'] = ids.round() keys_to_replace = { "cond_stage_model.model.positional_embedding": "cond_stage_model.transformer.text_model.embeddings.position_embedding.weight", "cond_stage_model.model.token_embedding.weight": "cond_stage_model.transformer.text_model.embeddings.token_embedding.weight", "cond_stage_model.model.ln_final.weight": "cond_stage_model.transformer.text_model.final_layer_norm.weight", "cond_stage_model.model.ln_final.bias": "cond_stage_model.transformer.text_model.final_layer_norm.bias", } for x in keys_to_replace: if x in sd: sd[keys_to_replace[x]] = sd.pop(x) resblock_to_replace = { "ln_1": "layer_norm1", "ln_2": "layer_norm2", "mlp.c_fc": "mlp.fc1", "mlp.c_proj": "mlp.fc2", "attn.out_proj": "self_attn.out_proj", } for resblock in range(24): for x in resblock_to_replace: for y in ["weight", "bias"]: k = "cond_stage_model.model.transformer.resblocks.{}.{}.{}".format(resblock, x, y) k_to = "cond_stage_model.transformer.text_model.encoder.layers.{}.{}.{}".format(resblock, resblock_to_replace[x], y) if k in sd: sd[k_to] = sd.pop(k) for y in ["weight", "bias"]: k_from = "cond_stage_model.model.transformer.resblocks.{}.attn.in_proj_{}".format(resblock, y) if k_from in sd: weights = sd.pop(k_from) for x in range(3): p = ["self_attn.q_proj", "self_attn.k_proj", "self_attn.v_proj"] k_to = "cond_stage_model.transformer.text_model.encoder.layers.{}.{}.{}".format(resblock, p[x], y) sd[k_to] = weights[1024*x:1024*(x + 1)] for x in load_state_dict_to: x.load_state_dict(sd, strict=False) if len(m) > 0 and verbose: print("missing keys:") print(m) if len(u) > 0 and verbose: print("unexpected keys:") print(u) model.eval() return model LORA_CLIP_MAP = { "mlp.fc1": "mlp_fc1", "mlp.fc2": "mlp_fc2", "self_attn.k_proj": "self_attn_k_proj", "self_attn.q_proj": "self_attn_q_proj", "self_attn.v_proj": "self_attn_v_proj", "self_attn.out_proj": "self_attn_out_proj", } LORA_UNET_MAP = { "proj_in": "proj_in", "proj_out": "proj_out", "transformer_blocks.0.attn1.to_q": "transformer_blocks_0_attn1_to_q", "transformer_blocks.0.attn1.to_k": "transformer_blocks_0_attn1_to_k", "transformer_blocks.0.attn1.to_v": "transformer_blocks_0_attn1_to_v", "transformer_blocks.0.attn1.to_out.0": "transformer_blocks_0_attn1_to_out_0", "transformer_blocks.0.attn2.to_q": "transformer_blocks_0_attn2_to_q", "transformer_blocks.0.attn2.to_k": "transformer_blocks_0_attn2_to_k", "transformer_blocks.0.attn2.to_v": "transformer_blocks_0_attn2_to_v", "transformer_blocks.0.attn2.to_out.0": "transformer_blocks_0_attn2_to_out_0", "transformer_blocks.0.ff.net.0.proj": "transformer_blocks_0_ff_net_0_proj", "transformer_blocks.0.ff.net.2": "transformer_blocks_0_ff_net_2", } def load_lora(path, to_load): lora = load_torch_file(path) patch_dict = {} loaded_keys = set() for x in to_load: A_name = "{}.lora_up.weight".format(x) B_name = "{}.lora_down.weight".format(x) alpha_name = "{}.alpha".format(x) if A_name in lora.keys(): alpha = None if alpha_name in lora.keys(): alpha = lora[alpha_name].item() loaded_keys.add(alpha_name) patch_dict[to_load[x]] = (lora[A_name], lora[B_name], alpha) loaded_keys.add(A_name) loaded_keys.add(B_name) for x in lora.keys(): if x not in loaded_keys: print("lora key not loaded", x) return patch_dict def model_lora_keys(model, key_map={}): sdk = model.state_dict().keys() counter = 0 for b in range(12): tk = "model.diffusion_model.input_blocks.{}.1".format(b) up_counter = 0 for c in LORA_UNET_MAP: k = "{}.{}.weight".format(tk, c) if k in sdk: lora_key = "lora_unet_down_blocks_{}_attentions_{}_{}".format(counter // 2, counter % 2, LORA_UNET_MAP[c]) key_map[lora_key] = k up_counter += 1 if up_counter >= 4: counter += 1 for c in LORA_UNET_MAP: k = "model.diffusion_model.middle_block.1.{}.weight".format(c) if k in sdk: lora_key = "lora_unet_mid_block_attentions_0_{}".format(LORA_UNET_MAP[c]) key_map[lora_key] = k counter = 3 for b in range(12): tk = "model.diffusion_model.output_blocks.{}.1".format(b) up_counter = 0 for c in LORA_UNET_MAP: k = "{}.{}.weight".format(tk, c) if k in sdk: lora_key = "lora_unet_up_blocks_{}_attentions_{}_{}".format(counter // 3, counter % 3, LORA_UNET_MAP[c]) key_map[lora_key] = k up_counter += 1 if up_counter >= 4: counter += 1 counter = 0 text_model_lora_key = "lora_te_text_model_encoder_layers_{}_{}" for b in range(24): for c in LORA_CLIP_MAP: k = "transformer.text_model.encoder.layers.{}.{}.weight".format(b, c) if k in sdk: lora_key = text_model_lora_key.format(b, LORA_CLIP_MAP[c]) key_map[lora_key] = k return key_map class ModelPatcher: def __init__(self, model): self.model = model self.patches = [] self.backup = {} def clone(self): n = ModelPatcher(self.model) n.patches = self.patches[:] return n def add_patches(self, patches, strength=1.0): p = {} model_sd = self.model.state_dict() for k in patches: if k in model_sd: p[k] = patches[k] self.patches += [(strength, p)] return p.keys() def patch_model(self): model_sd = self.model.state_dict() for p in self.patches: for k in p[1]: v = p[1][k] key = k if key not in model_sd: print("could not patch. key doesn't exist in model:", k) continue weight = model_sd[key] if key not in self.backup: self.backup[key] = weight.clone() alpha = p[0] mat1 = v[0] mat2 = v[1] if v[2] is not None: alpha *= v[2] / mat2.shape[0] weight += (alpha * torch.mm(mat1.flatten(start_dim=1).float(), mat2.flatten(start_dim=1).float())).reshape(weight.shape).type(weight.dtype).to(weight.device) return self.model def unpatch_model(self): model_sd = self.model.state_dict() for k in self.backup: model_sd[k][:] = self.backup[k] self.backup = {} def load_lora_for_models(model, clip, lora_path, strength_model, strength_clip): key_map = model_lora_keys(model.model) key_map = model_lora_keys(clip.cond_stage_model, key_map) loaded = load_lora(lora_path, key_map) new_modelpatcher = model.clone() k = new_modelpatcher.add_patches(loaded, strength_model) new_clip = clip.clone() k1 = new_clip.add_patches(loaded, strength_clip) k = set(k) k1 = set(k1) for x in loaded: if (x not in k) and (x not in k1): print("NOT LOADED", x) return (new_modelpatcher, new_clip) class CLIP: def __init__(self, config={}, embedding_directory=None, no_init=False): if no_init: return self.target_clip = config["target"] if "params" in config: params = config["params"] else: params = {} if self.target_clip == "ldm.modules.encoders.modules.FrozenOpenCLIPEmbedder": clip = sd2_clip.SD2ClipModel tokenizer = sd2_clip.SD2Tokenizer elif self.target_clip == "ldm.modules.encoders.modules.FrozenCLIPEmbedder": clip = sd1_clip.SD1ClipModel tokenizer = sd1_clip.SD1Tokenizer self.cond_stage_model = clip(**(params)) self.tokenizer = tokenizer(embedding_directory=embedding_directory) self.patcher = ModelPatcher(self.cond_stage_model) def clone(self): n = CLIP(no_init=True) n.target_clip = self.target_clip n.patcher = self.patcher.clone() n.cond_stage_model = self.cond_stage_model n.tokenizer = self.tokenizer return n def load_from_state_dict(self, sd): self.cond_stage_model.transformer.load_state_dict(sd, strict=False) def add_patches(self, patches, strength=1.0): return self.patcher.add_patches(patches, strength) def clip_layer(self, layer_idx): return self.cond_stage_model.clip_layer(layer_idx) def encode(self, text): tokens = self.tokenizer.tokenize_with_weights(text) try: self.patcher.patch_model() cond = self.cond_stage_model.encode_token_weights(tokens) self.patcher.unpatch_model() except Exception as e: self.patcher.unpatch_model() raise e return cond class VAE: def __init__(self, ckpt_path=None, scale_factor=0.18215, device="cuda", config=None): if config is None: #default SD1.x/SD2.x VAE parameters ddconfig = {'double_z': True, 'z_channels': 4, 'resolution': 256, 'in_channels': 3, 'out_ch': 3, 'ch': 128, 'ch_mult': [1, 2, 4, 4], 'num_res_blocks': 2, 'attn_resolutions': [], 'dropout': 0.0} self.first_stage_model = AutoencoderKL(ddconfig, {'target': 'torch.nn.Identity'}, 4, monitor="val/rec_loss", ckpt_path=ckpt_path) else: self.first_stage_model = AutoencoderKL(**(config['params']), ckpt_path=ckpt_path) self.first_stage_model = self.first_stage_model.eval() self.scale_factor = scale_factor self.device = device def decode(self, samples): model_management.unload_model() self.first_stage_model = self.first_stage_model.to(self.device) samples = samples.to(self.device) pixel_samples = self.first_stage_model.decode(1. / self.scale_factor * samples) pixel_samples = torch.clamp((pixel_samples + 1.0) / 2.0, min=0.0, max=1.0) self.first_stage_model = self.first_stage_model.cpu() pixel_samples = pixel_samples.cpu().movedim(1,-1) return pixel_samples def encode(self, pixel_samples): model_management.unload_model() self.first_stage_model = self.first_stage_model.to(self.device) pixel_samples = pixel_samples.movedim(-1,1).to(self.device) samples = self.first_stage_model.encode(2. * pixel_samples - 1.).sample() * self.scale_factor self.first_stage_model = self.first_stage_model.cpu() samples = samples.cpu() return samples def load_clip(ckpt_path, embedding_directory=None): clip_data = load_torch_file(ckpt_path) config = {} if "text_model.encoder.layers.22.mlp.fc1.weight" in clip_data: config['target'] = 'ldm.modules.encoders.modules.FrozenOpenCLIPEmbedder' else: config['target'] = 'ldm.modules.encoders.modules.FrozenCLIPEmbedder' clip = CLIP(config=config, embedding_directory=embedding_directory) clip.load_from_state_dict(clip_data) return clip def load_checkpoint(config_path, ckpt_path, output_vae=True, output_clip=True, embedding_directory=None): config = OmegaConf.load(config_path) model_config_params = config['model']['params'] clip_config = model_config_params['cond_stage_config'] scale_factor = model_config_params['scale_factor'] vae_config = model_config_params['first_stage_config'] clip = None vae = None class WeightsLoader(torch.nn.Module): pass w = WeightsLoader() load_state_dict_to = [] if output_vae: vae = VAE(scale_factor=scale_factor, config=vae_config) w.first_stage_model = vae.first_stage_model load_state_dict_to = [w] if output_clip: clip = CLIP(config=clip_config, embedding_directory=embedding_directory) w.cond_stage_model = clip.cond_stage_model load_state_dict_to = [w] model = load_model_from_config(config, ckpt_path, verbose=False, load_state_dict_to=load_state_dict_to) return (ModelPatcher(model), clip, vae)