[release] v0.2.7 (hpcaitech#3094)

[release] v0.2.6 (hpcaitech#3057)

Update version.txt (hpcaitech#2727)

[release] update version (hpcaitech#2691)

[release] v0.2.3 (hpcaitech#2669)

* [release] v0.2.3

* polish code

[release] v0.2.2 (hpcaitech#2661)

[workflow] fixed broken rellease workflows (hpcaitech#2604)

[version] 0.1.14 -> 0.2.0 (hpcaitech#2286)

[version] 0.1.13 (hpcaitech#2152)

[zero] add L2 gradient clipping for ZeRO (hpcaitech#2112)

* [zero] add L2 gradient clipping

* [testing] add MlpModel

* [zero] add unit test for grad clipping

* fix atol