[Matrix]: add unit tests on sparse projection matrix.
[Matrix]: add unit tests on sparse projection matrix.

icoming/FlashX,icoming/FlashX,icoming/FlashX,flashxio/FlashX,flashxio/FlashX,flashxio/FlashX,icoming/FlashX,icoming/FlashX,flashxio/FlashX,flashxio/FlashX,flashxio/FlashX