Deepxde

This is a bugfix release for backend paddle.

DeepXDE supports data-parallel training of PINN now.🎉🎉🎉

Areas of improvement

- Backend tensorflow.compat.v1: Support data-parallel training of PINN via Horovod in both weak and strong scaling modes
- Backend paddle: Some updates to support the new Paddle version
- Bug fix for Float16

New APIs

- Add `dde.config.set_parallel_scaling` to set parallel mode
- Add `dde.config.set_hvd_opt_options` for `hvd.DistributedOptimzer`

We stop the support of Python 3.7 from this release.

Areas of improvement

- If no backend is selected, automatically find an available backend.

Areas of improvement

- Many improvements for backends:
- Display more information
- Verify if the backend is available/importable
- Add interactive installation of Paddle
- Backend PyTorch: `Model.restore` supports restoring model to a specified device
- Use setuptools_scm for VCS versioning

New APIs

- Support new geometry `dde.geometry.Ellipse`

This release is used to test the automated release workflow.

Areas of improvement

- Support float16
- Backend TensorFlow supports `Model.state_dict`
- Migrate build config from setup.py to pyproject.toml
- Migrate CI from Travis to GitHub Actions
- Many examples and documentation improvements