Secretflow

Added

- Development and release docker.
- FL model strategy.
- Sigmoid approximation in python.
- SS LR.
- Verical FL LR.
- Auto ray.get for nested params with pyu objects in proxy decorated cls.
- Link desc in spu construction.

Changed

- Refactor datasets from oss instead of lfs.
- Many doc improvements.

Fixed

- SecureAggregator `average` when weights are multi-dimensions.

Added

- Vertical dp.

Changed

- Many docs improvements.

Fixed

- Increase H2A mask bits
- Include c++ lib in setup.

Added

- simulation.dataset for tutorial
- update tutorial of FL SL & SFXgboost
- add csv stream reader for FL

Fixed

- fix sf.init argument.

Fixed

- typos, grammatical errors, implicit in docs.