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Co-authored-by: liuzhe <liuzhe.cs@pku.edu.cn>

* First commit for WS in Retiarii

* Refactor ENAS trainer

* Fix DARTS trainer

* Fix ENAS trainer

* Fix issues in DARTS and Proxyless

* Fix ProxylessNAS and Random trainer

* Refactor mask

* update title level

* Update examples & reproduction results of darts
Co-authored-by: colorjam <im.cqyan@google.com>

Co-authored-by: liuzhe-lz <40699903+liuzhe-lz@users.noreply.github.com>

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.15.2 to 1.15.4.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](https://github.com/tensorflow/tensorflow/compare/v1.15.2...v1.15.4

)
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* 🚧 fix spos always affine=False bug; change workers from to 4 to avoid dali breaking out; add dump_checkpoint to save the result searched by scratch.py

* 🐛

 fix bug of import os
Co-authored-by: limingyao <limingyao@ainirobot.com>

* New Crowdin translations by Github Action

* remove removed files in en_US
Co-authored-by: Crowdin Bot <support+bot@crowdin.com>