* gpt2 training perf
* gpt2 training perf
* debug
* debug
* debug
* fix bug
* minor
* on comments
* dynamic sql
* fix build
* minor
* linked hash
* on comments
* minor
* mem
* minor
Co-authored-by: Ethan Tao <ettao@microsoft.com>
* pipeline transformer
* clean up
* address feedback
* add record/wait for first stage and updated split script
* address feedback
* make recv/send signal as initializer
* merge
* address feedback
* unify input and initializer
* address feedback and bug fix
* minor fix
* windows build
* fix