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Add LETOR MQ2008 for rank demo

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kalenhaha
2014-05-12 22:21:07 +08:00
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demo/rank/README
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Demonstrating how to use XGBoost accomplish regression tasks on computer hardware dataset https://archive.ics.uci.edu/ml/datasets/Computer+Hardware
Run: ./runexp.sh
Format of input: LIBSVM format
Format of ```featmap.txt: <featureid> <featurename> <q or i or int>\n ```:
- Feature id must be from 0 to number of features, in sorted order.
- i means this feature is binary indicator feature
- q means this feature is a quantitative value, such as age, time, can be missing
- int means this feature is integer value (when int is hinted, the decision boundary will be integer)
Explainations: https://github.com/tqchen/xgboost/wiki/Regression
The dataset for ranking demo is from LETOR04 MQ2008 fold1,http://research.microsoft.com/en-us/um/beijing/projects/letor/letor4download.aspx