158 lines
5.7 KiB
Python
158 lines
5.7 KiB
Python
# extract approximating LoRA by svd from two SD models
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# The code is based on https://github.com/cloneofsimo/lora/blob/develop/lora_diffusion/cli_svd.py
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# Thanks to cloneofsimo!
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import argparse
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import os
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import torch
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from safetensors.torch import load_file, save_file
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from tqdm import tqdm
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import library.model_util as model_util
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import lora
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CLAMP_QUANTILE = 0.99
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MIN_DIFF = 1e-6
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def save_to_file(file_name, model, state_dict, dtype):
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if dtype is not None:
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for key in list(state_dict.keys()):
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if type(state_dict[key]) == torch.Tensor:
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state_dict[key] = state_dict[key].to(dtype)
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if os.path.splitext(file_name)[1] == '.safetensors':
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save_file(model, file_name)
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else:
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torch.save(model, file_name)
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def svd(args):
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def str_to_dtype(p):
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if p == 'float':
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return torch.float
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if p == 'fp16':
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return torch.float16
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if p == 'bf16':
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return torch.bfloat16
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return None
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save_dtype = str_to_dtype(args.save_precision)
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print(f"loading SD model : {args.model_org}")
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text_encoder_o, _, unet_o = model_util.load_models_from_stable_diffusion_checkpoint(args.v2, args.model_org)
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print(f"loading SD model : {args.model_tuned}")
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text_encoder_t, _, unet_t = model_util.load_models_from_stable_diffusion_checkpoint(args.v2, args.model_tuned)
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# create LoRA network to extract weights
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lora_network_o = lora.create_network(1.0, args.dim, None, text_encoder_o, unet_o)
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lora_network_t = lora.create_network(1.0, args.dim, None, text_encoder_t, unet_t)
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assert len(lora_network_o.text_encoder_loras) == len(
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lora_network_t.text_encoder_loras), f"model version is different (SD1.x vs SD2.x) / それぞれのモデルのバージョンが違います（SD1.xベースとSD2.xベース） "
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# get diffs
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diffs = {}
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text_encoder_different = False
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for i, (lora_o, lora_t) in enumerate(zip(lora_network_o.text_encoder_loras, lora_network_t.text_encoder_loras)):
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lora_name = lora_o.lora_name
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module_o = lora_o.org_module
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module_t = lora_t.org_module
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diff = module_t.weight - module_o.weight
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# Text Encoder might be same
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if torch.max(torch.abs(diff)) > MIN_DIFF:
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text_encoder_different = True
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diff = diff.float()
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diffs[lora_name] = diff
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if not text_encoder_different:
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print("Text encoder is same. Extract U-Net only.")
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lora_network_o.text_encoder_loras = []
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diffs = {}
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for i, (lora_o, lora_t) in enumerate(zip(lora_network_o.unet_loras, lora_network_t.unet_loras)):
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lora_name = lora_o.lora_name
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module_o = lora_o.org_module
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module_t = lora_t.org_module
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diff = module_t.weight - module_o.weight
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diff = diff.float()
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if args.device:
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diff = diff.to(args.device)
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diffs[lora_name] = diff
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# make LoRA with svd
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print("calculating by svd")
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rank = args.dim
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lora_weights = {}
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with torch.no_grad():
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for lora_name, mat in tqdm(list(diffs.items())):
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conv2d = (len(mat.size()) == 4)
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if conv2d:
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mat = mat.squeeze()
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U, S, Vh = torch.linalg.svd(mat)
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U = U[:, :rank]
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S = S[:rank]
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U = U @ torch.diag(S)
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Vh = Vh[:rank, :]
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dist = torch.cat([U.flatten(), Vh.flatten()])
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hi_val = torch.quantile(dist, CLAMP_QUANTILE)
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low_val = -hi_val
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U = U.clamp(low_val, hi_val)
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Vh = Vh.clamp(low_val, hi_val)
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lora_weights[lora_name] = (U, Vh)
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# make state dict for LoRA
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lora_network_o.apply_to(text_encoder_o, unet_o, text_encoder_different, True) # to make state dict
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lora_sd = lora_network_o.state_dict()
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print(f"LoRA has {len(lora_sd)} weights.")
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for key in list(lora_sd.keys()):
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lora_name = key.split('.')[0]
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i = 0 if "lora_up" in key else 1
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weights = lora_weights[lora_name][i]
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# print(key, i, weights.size(), lora_sd[key].size())
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if len(lora_sd[key].size()) == 4:
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weights = weights.unsqueeze(2).unsqueeze(3)
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assert weights.size() == lora_sd[key].size()
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lora_sd[key] = weights
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# load state dict to LoRA and save it
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info = lora_network_o.load_state_dict(lora_sd)
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print(f"Loading extracted LoRA weights: {info}")
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dir_name = os.path.dirname(args.save_to)
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if dir_name and not os.path.exists(dir_name):
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os.makedirs(dir_name, exist_ok=True)
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lora_network_o.save_weights(args.save_to, save_dtype)
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print(f"LoRA weights are saved to: {args.save_to}")
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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parser.add_argument("--v2", action='store_true',
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help='load Stable Diffusion v2.x model / Stable Diffusion 2.xのモデルを読み込む')
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parser.add_argument("--save_precision", type=str, default=None,
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choices=[None, "float", "fp16", "bf16"], help="precision in saving, same to merging if omitted / 保存時に精度を変更して保存する、省略時はfloat")
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parser.add_argument("--model_org", type=str, default=None,
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help="Stable Diffusion original model: ckpt or safetensors file / 元モデル、ckptまたはsafetensors")
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parser.add_argument("--model_tuned", type=str, default=None,
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help="Stable Diffusion tuned model, LoRA is difference of `original to tuned`: ckpt or safetensors file / 派生モデル（生成されるLoRAは元→派生の差分になります）、ckptまたはsafetensors")
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parser.add_argument("--save_to", type=str, default=None,
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help="destination file name: ckpt or safetensors file / 保存先のファイル名、ckptまたはsafetensors")
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parser.add_argument("--dim", type=int, default=4, help="dimension of LoRA (default 4) / LoRAの次元数（デフォルト4）")
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parser.add_argument("--device", type=str, default=None, help="device to use, 'cuda' for GPU / 計算を行うデバイス、'cuda'でGPUを使う")
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args = parser.parse_args()
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svd(args) |