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fix: prevent crash when args.adapter_file is None in sft_trainer #921

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fix: prevent crash when args.adapter_file is None in sft_trainer #921

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14 changes: 9 additions & 5 deletions mlx_vlm/trainer/sft_trainer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -468,20 +468,24 @@ def step(batch, prev_grad, do_update):

# Save checkpoint
if it % args.steps_per_save == 0 and rank == 0:
save_adapter(model, args.adapter_file)
adapter_file = args.adapter_file or "adapters.safetensors"
Path(adapter_file).parent.mkdir(parents=True, exist_ok=True)
save_adapter(model, adapter_file)
checkpoint = (
Path(args.adapter_file).parent / f"{it:07d}_adapters.safetensors"
Path(adapter_file).parent / f"{it:07d}_adapters.safetensors"
)
save_adapter(model, checkpoint)
print(
f"{Colors.OKBLUE}Iter {it}: Saved adapter weights to "
f"{args.adapter_file} and {checkpoint}.{Colors.ENDC}",
f"{adapter_file} and {checkpoint}.{Colors.ENDC}",
flush=True,
)

# Save final weights
if rank == 0:
save_adapter(model, args.adapter_file)
adapter_file = args.adapter_file or "adapters.safetensors"
Path(adapter_file).parent.mkdir(parents=True, exist_ok=True)
save_adapter(model, adapter_file)
print(
f"{Colors.OKGREEN}Saved final adapter weights to {args.adapter_file}.{Colors.ENDC}"
f"{Colors.OKGREEN}Saved final adapter weights to {adapter_file}.{Colors.ENDC}"
)