Add LETOR MQ2008 for rank demo
Merge branch 'dev' of https://github.com/tqchen/xgboost into dev
small bug in ndcg eval
add in grad and hess rescale in lambdarank
add AMS metric
some fix
add ams
ok
change data format to include weight in binary file, add get weight to python
add xgcombine_buffer with weights
cleanup code
bug fix in pairwise rank
ok
ok
fix numpy convert
a correct version
ok
Update README.md
new lambda rank interface
Impement new Lambda rank interface