v0.2.7
[moe] fix MoE bugs (#1628)
[gemini] add GeminiMemoryManger (#832)
[doc] add deepspeed citation and copyright (#2996)
[NFC] polish colossalai/zero/sharded_param/__init__.py code style (#1717)
[ddp] add is_ddp_ignored (#2434)
[Gemini] add GeminiAdamOptimizer (#1960)