* optimize performance

* fix

* improve coverage

* fix

* fix

* reduce performance influence

* add unit test

* fix

* no

* maintain old profiler

* add get profiler from serialization config

* add unit test

* improve coverage

* fix

* Revert "improve coverage"

This reverts commit 4a980bfda48adadee551d0e1c5740bc5b7389200.

* fix unit

* fix

* fix

* no

* fix bugs

* fix doc according to review

* fix api doc format

* fix api doc according to review

* fix bug and add unit test

* fix record event bug

* optimize chrome tracing display

* fix bug

* add comment

* add unit test

* fix a bug

* fix

* fix

* fix format

* add python profiler package

* update according to review

* fix bug

* fix bug

* fix bug

* add unit test

* Revert "add unit test"

This reverts commit 4e69ff71b0645e069afe5dd8fea0d07717852c48.

* reduce for pr

* add unit test

* modify for pr

* fix unittest

* update for ci coverage

* modify according to review

* fix bug

* improve coverage