theluyuan/DiffSynth-Studio
1
0
Fork 0
mirror of https://github.com/modelscope/DiffSynth-Studio.git synced 2026-03-18 22:08:13 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #447 from modelscope/lora

Browse Source 
Lora
This commit is contained in:
Zhongjie Duan
2025-03-14 15:34:22 +08:00
committed by GitHub
parent 32422b49ee 1fd3d67379
commit ca40074d72
2 changed files with 56 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

116
diffsynth/models/lora.py
View File

@@ -195,85 +195,73 @@ class FluxLoRAFromCivitai(LoRAFromCivitai):
"txt.mod": "txt_mod",
}
class GeneralLoRAFromPeft:
def __init__(self):
self.supported_model_classes = [SDUNet, SDXLUNet, SD3DiT, HunyuanDiT, FluxDiT, CogDiT, WanModel]
def fetch_device_dtype_from_state_dict(self, state_dict):
device, torch_dtype = None, None
for name, param in state_dict.items():
device, torch_dtype = param.device, param.dtype
break
return device, torch_dtype
def convert_state_dict(self, state_dict, alpha=1.0, target_state_dict={}):
device, torch_dtype = self.fetch_device_dtype_from_state_dict(target_state_dict)
if torch_dtype == torch.float8_e4m3fn:
torch_dtype = torch.float32
state_dict_ = {}
for key in state_dict:
def get_name_dict(self, lora_state_dict):
lora_name_dict = {}
for key in lora_state_dict:
if ".lora_B." not in key:
continue
weight_up = state_dict[key].to(device=device, dtype=torch_dtype)
weight_down = state_dict[key.replace(".lora_B.", ".lora_A.")].to(device=device, dtype=torch_dtype)
if len(weight_up.shape) == 4:
weight_up = weight_up.squeeze(3).squeeze(2)
weight_down = weight_down.squeeze(3).squeeze(2)
lora_weight = alpha * torch.mm(weight_up, weight_down).unsqueeze(2).unsqueeze(3)
else:
lora_weight = alpha * torch.mm(weight_up, weight_down)
keys = key.split(".")
if len(keys) > keys.index("lora_B") + 2:
keys.pop(keys.index("lora_B") + 1)
keys.pop(keys.index("lora_B"))
if keys[0] == "diffusion_model":
keys.pop(0)
target_name = ".".join(keys)
if target_name.startswith("diffusion_model."):
target_name = target_name[len("diffusion_model."):]
if target_name not in target_state_dict:
return {}
state_dict_[target_name] = lora_weight.cpu()
return state_dict_
lora_name_dict[target_name] = (key, key.replace(".lora_B.", ".lora_A."))
return lora_name_dict
def match(self, model: torch.nn.Module, state_dict_lora):
lora_name_dict = self.get_name_dict(state_dict_lora)
model_name_dict = {name: None for name, _ in model.named_parameters()}
matched_num = sum([i in model_name_dict for i in lora_name_dict])
if matched_num == len(lora_name_dict):
return "", ""
else:
return None
def fetch_device_and_dtype(self, state_dict):
device, dtype = None, None
for name, param in state_dict.items():
device, dtype = param.device, param.dtype
break
computation_device = device
computation_dtype = dtype
if computation_device == torch.device("cpu"):
if torch.cuda.is_available():
computation_device = torch.device("cuda")
if computation_dtype == torch.float8_e4m3fn:
computation_dtype = torch.float32
return device, dtype, computation_device, computation_dtype
def load(self, model, state_dict_lora, lora_prefix="", alpha=1.0, model_resource=""):
state_dict_model = model.state_dict()
state_dict_lora = self.convert_state_dict(state_dict_lora, alpha=alpha, target_state_dict=state_dict_model)
if len(state_dict_lora) > 0:
print(f" {len(state_dict_lora)} tensors are updated.")
for name in state_dict_lora:
if state_dict_model[name].dtype == torch.float8_e4m3fn:
weight = state_dict_model[name].to(torch.float32)
lora_weight = state_dict_lora[name].to(
dtype=torch.float32,
device=state_dict_model[name].device
)
state_dict_model[name] = (weight + lora_weight).to(
dtype=state_dict_model[name].dtype,
device=state_dict_model[name].device
)
else:
state_dict_model[name] += state_dict_lora[name].to(
dtype=state_dict_model[name].dtype,
device=state_dict_model[name].device
)
model.load_state_dict(state_dict_model)
device, dtype, computation_device, computation_dtype = self.fetch_device_and_dtype(state_dict_model)
lora_name_dict = self.get_name_dict(state_dict_lora)
for name in lora_name_dict:
weight_up = state_dict_lora[lora_name_dict[name][0]].to(device=computation_device, dtype=computation_dtype)
weight_down = state_dict_lora[lora_name_dict[name][1]].to(device=computation_device, dtype=computation_dtype)
if len(weight_up.shape) == 4:
weight_up = weight_up.squeeze(3).squeeze(2)
weight_down = weight_down.squeeze(3).squeeze(2)
weight_lora = alpha * torch.mm(weight_up, weight_down).unsqueeze(2).unsqueeze(3)
else:
weight_lora = alpha * torch.mm(weight_up, weight_down)
weight_model = state_dict_model[name].to(device=computation_device, dtype=computation_dtype)
weight_patched = weight_model + weight_lora
state_dict_model[name] = weight_patched.to(device=device, dtype=dtype)
print(f" {len(lora_name_dict)} tensors are updated.")
model.load_state_dict(state_dict_model)
def match(self, model, state_dict_lora):
for model_class in self.supported_model_classes:
if not isinstance(model, model_class):
continue
state_dict_model = model.state_dict()
try:
state_dict_lora_ = self.convert_state_dict(state_dict_lora, alpha=1.0, target_state_dict=state_dict_model)
if len(state_dict_lora_) > 0:
return "", ""
except:
pass
return None
class HunyuanVideoLoRAFromCivitai(LoRAFromCivitai):

4
diffsynth/models/model_manager.py
View File

@@ -376,6 +376,7 @@ class ModelManager:
self.load_lora(file_path_, state_dict=state_dict, lora_alpha=lora_alpha)
else:
print(f"Loading LoRA models from file: {file_path}")
is_loaded = False
if len(state_dict) == 0:
state_dict = load_state_dict(file_path)
for model_name, model, model_path in zip(self.model_name, self.model, self.model_path):
@@ -385,7 +386,10 @@ class ModelManager:
print(f" Adding LoRA to {model_name} ({model_path}).")
lora_prefix, model_resource = match_results
lora.load(model, state_dict, lora_prefix, alpha=lora_alpha, model_resource=model_resource)
is_loaded = True
break
if not is_loaded:
print(f" Cannot load LoRA: {file_path}")
def load_model(self, file_path, model_names=None, device=None, torch_dtype=None):