e08542c fix doc e95c962 remove I prefix from interface, serializable now takes in pointer git-subtree-dir: subtree/rabit git-subtree-split: e08542c6357bc044199e4876d9bea949d05f614c
git-subtree-dir: subtree/rabit git-subtree-split: c7282acb2a92e1d6a32614889ff466fec58937f3