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[lora] fix z-image non-diffusers lora loading. #13255

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[lora] fix z-image non-diffusers lora loading. #13255

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8 changes: 6 additions & 2 deletions src/diffusers/loaders/lora_conversion_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2538,8 +2538,12 @@ def normalize_out_key(k: str) -> str:

def get_alpha_scales(down_weight, alpha_key):
rank = down_weight.shape[0]
alpha = state_dict.pop(alpha_key).item()
scale = alpha / rank # LoRA is scaled by 'alpha / rank' in forward pass, so we need to scale it back here
alpha_tensor = state_dict.pop(alpha_key, None)
if alpha_tensor is None:
return 1.0, 1.0
scale = (
alpha_tensor.item() / rank
) # LoRA is scaled by 'alpha / rank' in forward pass, so we need to scale it back here
scale_down = scale
scale_up = 1.0
while scale_down * 2 < scale_up:
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