diff --git a/pom.xml b/pom.xml
index 5e87d209..309388c1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -32,7 +32,7 @@
be accompanied by a bump in version number, regardless of how minor the change.
-->
- 0.7.13
+ 0.7.14
sanity-maven-repo
diff --git a/src/main/java/quickml/supervised/classifier/Classifiers.java b/src/main/java/quickml/supervised/classifier/Classifiers.java
index 460dd7c8..39756d2b 100644
--- a/src/main/java/quickml/supervised/classifier/Classifiers.java
+++ b/src/main/java/quickml/supervised/classifier/Classifiers.java
@@ -24,8 +24,10 @@
import quickml.supervised.predictiveModelOptimizer.PredictiveModelOptimizerBuilder;
import quickml.supervised.predictiveModelOptimizer.fieldValueRecommenders.FixedOrderRecommender;
+import java.util.Arrays;
import java.util.List;
import java.util.Map;
+import java.util.Set;
import static quickml.supervised.classifier.decisionTree.TreeBuilder.*;
@@ -64,8 +66,8 @@ public static Pair