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travis-ci

Add training and test functions to integrate the native XGBoost library (#281)

* Add training & test functions by using the native XGBoost library

* Add xgboost4j.jar in core/lib

* Add NativeLibLoader to a load custom-compiled xgboost library

* Update .gitignore

* Add a script to make a costom-built xgboost binary

* Use HadoopUtils.getTaskId() to generate unique ids

* Remove unnecessary functions in HiveUtils

* Add entries in define-all.hive

* Add XGBoostUDTF to provide common functionality for XGBoost

* Add XGBoostBinaryClassifierUDTF for binary classification

* Add a `hivemall.xgboost.lib property` for loading user-defined native library

* Add XGBoostMulticlassClassifierUDTF for multiclass classification

* Fix bugs in define-all-as-permanent.hive

* Rename an illegal file name

* Support XGBoost functions on DataFrame/Spark

* Update the XGBoost library

* Remove system scope in core/pom.xml

* Update import-packages.spark

* Add tests for train_xgboost_regr and train_xgboost_classifier

* Update bin/build_xgboost.sh

* Add tests for train_xgboost_multiclass_classifier

* Update .travis.yml

* Move xgboost functions into a xgboost submodule

* Update bin/build_xgboost.sh

* Apply revew comments

* Add -q options in .travis.yml

* Add a xgboost binary for Linux/x86_64

* Fix bugs in spark/*/pom.xml

* Add notations for XGBoost functions in HivemallOps

* Update .travis.yml to reduce # of executed tests

* Brush up exception handling

* Update compilation options for xgboost

* Add more tests for xgboost

* Remove unnecessary dependencies in pom.xml

* Build a jar for xgboost with portable binaries

* Remove static-links for libgcc and libstdg++

* Add an option to enable static links in bin/build_xgboost.sh

* Move the property of scala.version into topdir/pom.xml

* Fix bugs in bin/build_xgboost.sh

* Fix version numbers for xgboost

* Add activeByDefault in... (continued)

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