cleanup_old_checkpoints

cleanup_old_checkpoints(main_dir, keep_last_n)

Remove old checkpoints, keeping only the most recent N.

Parameters:

• main_dir (Path) – Main checkpoint directory.

• keep_last_n (int) – Number of most recent checkpoints to keep.

Raises:

• ValueError – If keep_last_n is less than 1.

• CheckpointNotFoundError – If the main directory does not exist.

Return type:

None