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feat: enhance merging logic for safetensors models to handle key prefixes correctly

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Kohya S
2025-02-28 23:52:29 +09:00
parent 5228db1548
commit 734333d0c9
1 changed files with 23 additions and 6 deletions
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29
tools/merge_sd3_safetensors.py
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@@ -53,22 +53,30 @@ def merge_safetensors(
# 3. Load and merge each model with memory management
# DiT/MMDiT - prefix: model.diffusion_model.
# This state dict may have VAE keys.
logger.info(f"Loading DiT model from {dit_path}")
dit_state_dict = load_safetensors(dit_path, device=device, disable_mmap=True)
logger.info(f"Adding DiT model with {len(dit_state_dict)} keys")
for key, value in dit_state_dict.items():
merged_state_dict[f"model.diffusion_model.{key}"] = value
if key.startswith("model.diffusion_model.") or key.startswith("first_stage_model."):
merged_state_dict[key] = value
else:
merged_state_dict[f"model.diffusion_model.{key}"] = value
# Free memory
del dit_state_dict
gc.collect()
# VAE - prefix: first_stage_model.
# May be omitted if VAE is already included in DiT model.
if vae_path:
logger.info(f"Loading VAE model from {vae_path}")
vae_state_dict = load_safetensors(vae_path, device=device, disable_mmap=True)
logger.info(f"Adding VAE model with {len(vae_state_dict)} keys")
for key, value in vae_state_dict.items():
merged_state_dict[f"first_stage_model.{key}"] = value
if key.startswith("first_stage_model."):
merged_state_dict[key] = value
else:
merged_state_dict[f"first_stage_model.{key}"] = value
# Free memory
del vae_state_dict
gc.collect()
@@ -79,7 +87,10 @@ def merge_safetensors(
clip_l_state_dict = load_safetensors(clip_l_path, device=device, disable_mmap=True)
logger.info(f"Adding CLIP-L model with {len(clip_l_state_dict)} keys")
for key, value in clip_l_state_dict.items():
merged_state_dict[f"text_encoders.clip_l.{key}"] = value
if key.startswith("text_encoders.clip_l.transformer."):
merged_state_dict[key] = value
else:
merged_state_dict[f"text_encoders.clip_l.transformer.{key}"] = value
# Free memory
del clip_l_state_dict
gc.collect()
@@ -90,7 +101,10 @@ def merge_safetensors(
clip_g_state_dict = load_safetensors(clip_g_path, device=device, disable_mmap=True)
logger.info(f"Adding CLIP-G model with {len(clip_g_state_dict)} keys")
for key, value in clip_g_state_dict.items():
merged_state_dict[f"text_encoders.clip_g.{key}"] = value
if key.startswith("text_encoders.clip_g.transformer."):
merged_state_dict[key] = value
else:
merged_state_dict[f"text_encoders.clip_g.transformer.{key}"] = value
# Free memory
del clip_g_state_dict
gc.collect()
@@ -101,7 +115,10 @@ def merge_safetensors(
t5xxl_state_dict = load_safetensors(t5xxl_path, device=device, disable_mmap=True)
logger.info(f"Adding T5-XXL model with {len(t5xxl_state_dict)} keys")
for key, value in t5xxl_state_dict.items():
merged_state_dict[f"text_encoders.t5xxl.{key}"] = value
if key.startswith("text_encoders.t5xxl.transformer."):
merged_state_dict[key] = value
else:
merged_state_dict[f"text_encoders.t5xxl.transformer.{key}"] = value
# Free memory
del t5xxl_state_dict
gc.collect()
@@ -115,7 +132,7 @@ def merge_safetensors(
def main():
parser = argparse.ArgumentParser(description="Merge Stable Diffusion 3.5 model components into a single safetensors file")
parser.add_argument("--dit", required=True, help="Path to the DiT/MMDiT model")
parser.add_argument("--vae", help="Path to the VAE model")
parser.add_argument("--vae", help="Path to the VAE model. May be omitted if VAE is included in DiT model")
parser.add_argument("--clip_l", help="Path to the CLIP-L model")
parser.add_argument("--clip_g", help="Path to the CLIP-G model")
parser.add_argument("--t5xxl", help="Path to the T5-XXL model")