Change Log of Versions
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xgboost-0.1
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* Initial release

xgboost-0.2x
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* Python module
* Weighted samples instances
* Initial version of pairwise rank

xgboost-unity
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* Faster tree construction module
  - Allows subsample columns as well during tree construction
* Support for boosting from initial predictions
* Experimental version of LambdaRank
* Linear booster is now parallelized, using parallel coordinated descent.
* Add [code guide](src/README.md)