tqchen ea50f8e030 Squashed 'subtree/rabit/' changes from 1db6449..85b7463
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
2015-01-19 21:26:25 -08:00
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