* [plugin] torch ddp plugin add save sharded model
* [test] fix torch ddp ckpt io test
* [test] fix torch ddp ckpt io test
* [test] fix low level zero plugin test
* [test] fix low level zero plugin test
* [test] add debug info
* [test] add debug info
* [test] add debug info
* [test] add debug info
* [test] add debug info
* [test] fix low level zero plugin test
* [test] fix low level zero plugin test
* [test] remove debug info
* [checkpoint] support huggingface style sharded checkpoint, to be compatible with hf file naming format
* [checkpoint] support huggingface style sharded checkpoint, to be compatible with hf file naming format
* [checkpoint] Shard saved checkpoint add 'variant' field to customize filename
* [checkpoint] Shard saved checkpoint add 'variant' field to customize filename
* [checkpoint] Shard saved checkpoint add 'variant' field to customize filename
* [checkpoint] Shard saved checkpoint add 'variant' field to customize filename
---------
Co-authored-by: luchen <luchen@luchendeMacBook-Pro.local>
Co-authored-by: luchen <luchen@luchendeMBP.lan>
