* init a checkpoint dir
* [checkpoint]support resume for cosinewarmuplr
* [checkpoint]add unit test
* fix some bugs but still not OK
* fix bugs
* make it faster
* [checkpoint]support generalized scheduler
* polish
* [tensor] torch function return colotensor
* polish
* fix bugs
* remove debug info
* polish
* polish
* [tensor] test_model pass unittests
* polish
* [hotfix] fx get comm size bug
Co-authored-by: ZhaoYi1222 <zhaoyi9499@gmail.com>