[Matrix]: fix a bug in materialize computation in mapply_matrix.
[Matrix]: fix a bug in materialize computation in mapply_matrix.

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