v0.2.7
[embedding] rename FreqAwareEmbedding -> CachedEmbedding (#1699)
[zero] add zero wrappers (#2523)
Rename class method of ZeroDDP (#2692)
[hotfix] fix lightning error (#2529)
[ddp] ColoDDP uses bucket all-reduce (#1177)
[gemini] update the gpt example (#2527)