sketch of xgboost-spark

chooseBestBooster shall be in Boosters

remove tracker.py

rename XGBoost

remove cross-validation

jvm-packages/xgboost4j-demo/pom.xml

@@ -4,7 +4,7 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <parent>
-        <groupId>org.dmlc</groupId>
+        <groupId>ml.dmlc</groupId>
         <artifactId>xgboostjvm</artifactId>
         <version>0.1</version>
     </parent>
@@ -13,7 +13,7 @@
     <packaging>jar</packaging>
     <dependencies>
         <dependency>
-            <groupId>org.dmlc</groupId>
+            <groupId>ml.dmlc</groupId>
             <artifactId>xgboost4j</artifactId>
             <version>0.1</version>
         </dependency>

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/demo/CrossValidation.java

@@ -49,6 +49,7 @@ public class CrossValidation {
     //set additional eval_metrics
     String[] metrics = null;
 
-    String[] evalHist = XGBoost.crossValiation(params, trainMat, round, nfold, metrics, null, null);
+    String[] evalHist = XGBoost.crossValidation(params, trainMat, round, nfold, metrics, null,
+            null);
   }
 }