Secretflow

Fixed

- fix sf.init argument.

Fixed

- typos, grammatical errors, implicit in docs.

Added

- Secretflow shutdown.

Fixed

- LabelEncoder returns np.int dtype.

Added

- FlModel supports csv loader.

Changed

- Rename PPU to SPU.

Added

- MixLR demo.
- DP on split learning DNN.
- XGBoost tutorial.
- DataFrame and FedNdarray support astype method.

Changed

- Use lfs instead of http file.
- FL model requires model define no more when using load_model.
- dataframe.to_csv returns object ref.

Security

- Use more secure random.
- Complete security and not-for-production warning.