* Add LECO training script and associated tests
- Implemented `sdxl_train_leco.py` for training with LECO prompts, including argument parsing, model setup, training loop, and weight saving functionality.
- Created unit tests for `load_prompt_settings` in `test_leco_train_util.py` to validate loading of prompt configurations in both original and slider formats.
- Added basic syntax tests for `train_leco.py` and `sdxl_train_leco.py` to ensure modules are importable.
* fix: use getattr for safe attribute access in argument verification
* feat: add CUDA device compatibility validation and corresponding tests
* Revert "feat: add CUDA device compatibility validation and corresponding tests"
This reverts commit 6d3e51431b.
* feat: update predict_noise_xl to use vector embedding from add_time_ids
* feat: implement checkpointing in predict_noise and predict_noise_xl functions
* feat: remove unused submodules and update .gitignore to exclude .codex-tmp
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Co-authored-by: Kohya S. <52813779+kohya-ss@users.noreply.github.com>
