* "fix decode bug"

* "follow commnet"

* "fix error"

* "fix hook bug"

* fix based comment

* fix copyright

* fix based on comment

* add copyright hook

* add copyright hook

* refine copyright hook

* "test copyright hook"

* fix check style

* fix ci

* add gflags for C++ unittest

* "fix unsigned compare problem"

* "remove gtest from CMakeList"

* "remove namespace"

The buffer allocation size should be number of bytes, not number of
floats.

Fix #2567