e08542c fix doc
e95c962 remove I prefix from interface, serializable now takes in pointer
git-subtree-dir: subtree/rabit
git-subtree-split: e08542c6357bc044199e4876d9bea949d05f614c
85b7463 change def of reducer to take function ptr
fe6366e add engine base
a98720e more deps
git-subtree-dir: subtree/rabit
git-subtree-split: 85b746394e0bed36a22ebb12beb8672616b39047