v0.2.1
[moe] fix MoE bugs (#1628)
[gemini] add GeminiMemoryManger (#832)
[Gemini] update API of the chunkmemstatscollector. (#2129)
[zero] add zero wrappers (#2523)
[NFC] polish colossalai/zero/sharded_param/__init__.py code style (#1717)
[ddp] add is_ddp_ignored (#2434)
[Gemini] add GeminiAdamOptimizer (#1960)