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Fix checkpoint overwrite bug in train_sana_sprint_diffusers #12448

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Fix checkpoint overwrite bug in train_sana_sprint_diffusers #12448

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7 changes: 6 additions & 1 deletion examples/research_projects/sana/train_sana_sprint_diffusers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1145,6 +1145,11 @@ def save_model_hook(models, weights, output_dir):
elif isinstance(unwrapped_model, type(unwrap_model(disc))):
# Save only the heads
torch.save(unwrapped_model.heads.state_dict(), os.path.join(output_dir, "disc_heads.pt"))

# Skip frozen pretrained_model
elif isinstance(unwrapped_model, type(unwrap_model(transformer))):
pass

else:
raise ValueError(f"unexpected save model: {unwrapped_model.__class__}")

Expand All @@ -1161,7 +1166,7 @@ def load_model_hook(models, input_dir):
model = models.pop()
unwrapped_model = unwrap_model(model)

if isinstance(unwrapped_model, type(unwrap_model(transformer))):
if isinstance(unwrapped_model, type(unwrap_model(transformer))) and getattr(unwrapped_model, 'guidance', False):
transformer_ = model # noqa: F841
elif isinstance(unwrapped_model, type(unwrap_model(disc))):
# Load only the heads
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