199 lines
6.7 KiB
Python
199 lines
6.7 KiB
Python
# Convert LoRA to different rank approximation (should only be used to go to lower rank)
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# This code is based off the extract_lora_from_models.py file which is based on https://github.com/cloneofsimo/lora/blob/develop/lora_diffusion/cli_svd.py
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# Thanks to cloneofsimo and kohya
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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, safe_open
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from tqdm import tqdm
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from library import train_util, model_util
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def load_state_dict(file_name, dtype):
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if model_util.is_safetensors(file_name):
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sd = load_file(file_name)
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with safe_open(file_name, framework="pt") as f:
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metadata = f.metadata()
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else:
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sd = torch.load(file_name, map_location='cpu')
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metadata = None
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for key in list(sd.keys()):
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if type(sd[key]) == torch.Tensor:
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sd[key] = sd[key].to(dtype)
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return sd, metadata
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def save_to_file(file_name, model, state_dict, dtype, metadata):
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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 model_util.is_safetensors(file_name):
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save_file(model, file_name, metadata)
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else:
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torch.save(model, file_name)
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def resize_lora_model(lora_sd, new_rank, save_dtype, device, verbose):
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network_alpha = None
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network_dim = None
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verbose_str = "\n"
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CLAMP_QUANTILE = 0.99
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# Extract loaded lora dim and alpha
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for key, value in lora_sd.items():
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if network_alpha is None and 'alpha' in key:
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network_alpha = value
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if network_dim is None and 'lora_down' in key and len(value.size()) == 2:
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network_dim = value.size()[0]
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if network_alpha is not None and network_dim is not None:
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break
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if network_alpha is None:
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network_alpha = network_dim
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scale = network_alpha/network_dim
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new_alpha = float(scale*new_rank) # calculate new alpha from scale
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print(f"old dimension: {network_dim}, old alpha: {network_alpha}, new alpha: {new_alpha}")
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lora_down_weight = None
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lora_up_weight = None
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o_lora_sd = lora_sd.copy()
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block_down_name = None
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block_up_name = None
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print("resizing lora...")
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with torch.no_grad():
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for key, value in tqdm(lora_sd.items()):
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if 'lora_down' in key:
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block_down_name = key.split(".")[0]
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lora_down_weight = value
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if 'lora_up' in key:
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block_up_name = key.split(".")[0]
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lora_up_weight = value
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weights_loaded = (lora_down_weight is not None and lora_up_weight is not None)
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if (block_down_name == block_up_name) and weights_loaded:
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conv2d = (len(lora_down_weight.size()) == 4)
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if conv2d:
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lora_down_weight = lora_down_weight.squeeze()
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lora_up_weight = lora_up_weight.squeeze()
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if device:
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org_device = lora_up_weight.device
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lora_up_weight = lora_up_weight.to(args.device)
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lora_down_weight = lora_down_weight.to(args.device)
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full_weight_matrix = torch.matmul(lora_up_weight, lora_down_weight)
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U, S, Vh = torch.linalg.svd(full_weight_matrix)
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if verbose:
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s_sum = torch.sum(torch.abs(S))
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s_rank = torch.sum(torch.abs(S[:new_rank]))
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verbose_str+=f"{block_down_name:76} | "
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verbose_str+=f"sum(S) retained: {(s_rank)/s_sum:.1%}, max(S) ratio: {S[0]/S[new_rank]:0.1f}\n"
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U = U[:, :new_rank]
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S = S[:new_rank]
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U = U @ torch.diag(S)
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Vh = Vh[:new_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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if conv2d:
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U = U.unsqueeze(2).unsqueeze(3)
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Vh = Vh.unsqueeze(2).unsqueeze(3)
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if device:
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U = U.to(org_device)
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Vh = Vh.to(org_device)
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o_lora_sd[block_down_name + "." + "lora_down.weight"] = Vh.to(save_dtype).contiguous()
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o_lora_sd[block_up_name + "." + "lora_up.weight"] = U.to(save_dtype).contiguous()
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o_lora_sd[block_up_name + "." "alpha"] = torch.tensor(new_alpha).to(save_dtype)
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block_down_name = None
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block_up_name = None
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lora_down_weight = None
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lora_up_weight = None
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weights_loaded = False
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if verbose:
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print(verbose_str)
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print("resizing complete")
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return o_lora_sd, network_dim, new_alpha
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def resize(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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merge_dtype = str_to_dtype('float') # matmul method above only seems to work in float32
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save_dtype = str_to_dtype(args.save_precision)
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if save_dtype is None:
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save_dtype = merge_dtype
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print("loading Model...")
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lora_sd, metadata = load_state_dict(args.model, merge_dtype)
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print("resizing rank...")
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state_dict, old_dim, new_alpha = resize_lora_model(lora_sd, args.new_rank, save_dtype, args.device, args.verbose)
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# update metadata
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if metadata is None:
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metadata = {}
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comment = metadata.get("ss_training_comment", "")
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metadata["ss_training_comment"] = f"dimension is resized from {old_dim} to {args.new_rank}; {comment}"
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metadata["ss_network_dim"] = str(args.new_rank)
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metadata["ss_network_alpha"] = str(new_alpha)
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model_hash, legacy_hash = train_util.precalculate_safetensors_hashes(state_dict, metadata)
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metadata["sshs_model_hash"] = model_hash
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metadata["sshs_legacy_hash"] = legacy_hash
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print(f"saving model to: {args.save_to}")
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save_to_file(args.save_to, state_dict, state_dict, save_dtype, metadata)
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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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, float if omitted / 保存時の精度、未指定時はfloat")
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parser.add_argument("--new_rank", type=int, default=4,
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help="Specify rank of output LoRA / 出力するLoRAのrank (dim)")
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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("--model", type=str, default=None,
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help="LoRA model to resize at to new rank: ckpt or safetensors file / 読み込むLoRAモデル、ckptまたはsafetensors")
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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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parser.add_argument("--verbose", action="store_true",
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help="Display verbose resizing information / rank変更時の詳細情報を出力する")
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args = parser.parse_args()
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resize(args)
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