Refactor different classes into subpackages.

src/main/java/ca/joeltherrien/randomforest/CovariateRow.java

@@ -1,5 +1,6 @@
 package ca.joeltherrien.randomforest;
 
+import ca.joeltherrien.randomforest.covariates.Covariate;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 

src/main/java/ca/joeltherrien/randomforest/Row.java

@@ -1,6 +1,8 @@
 package ca.joeltherrien.randomforest;
 
 
+import ca.joeltherrien.randomforest.covariates.Covariate;
+
 import java.util.Map;
 
 public class Row<Y> extends CovariateRow {

src/main/java/ca/joeltherrien/randomforest/covariates/BooleanCovariate.java

@@ -1,4 +1,4 @@
-package ca.joeltherrien.randomforest;
+package ca.joeltherrien.randomforest.covariates;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;

src/main/java/ca/joeltherrien/randomforest/covariates/Covariate.java

@@ -1,4 +1,8 @@
-package ca.joeltherrien.randomforest;
+package ca.joeltherrien.randomforest.covariates;
+
+import ca.joeltherrien.randomforest.CovariateRow;
+import ca.joeltherrien.randomforest.Row;
+import ca.joeltherrien.randomforest.tree.Split;
 
 import java.io.Serializable;
 import java.util.*;

src/main/java/ca/joeltherrien/randomforest/covariates/FactorCovariate.java

@@ -1,4 +1,4 @@
-package ca.joeltherrien.randomforest;
+package ca.joeltherrien.randomforest.covariates;
 
 import lombok.EqualsAndHashCode;
 

src/main/java/ca/joeltherrien/randomforest/covariates/NumericCovariate.java

@@ -1,4 +1,4 @@
-package ca.joeltherrien.randomforest;
+package ca.joeltherrien.randomforest.covariates;
 
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;

src/main/java/ca/joeltherrien/randomforest/regression/MeanResponseCombiner.java

@@ -1,6 +1,6 @@
 package ca.joeltherrien.randomforest.regression;
 
-import ca.joeltherrien.randomforest.ResponseCombiner;
+import ca.joeltherrien.randomforest.tree.ResponseCombiner;
 
 import java.util.List;
 import java.util.Set;

src/main/java/ca/joeltherrien/randomforest/tree/Forest.java

@@ -1,11 +1,9 @@
 package ca.joeltherrien.randomforest.tree;
 
 import ca.joeltherrien.randomforest.CovariateRow;
-import ca.joeltherrien.randomforest.ResponseCombiner;
 import lombok.Builder;
 
 import java.util.Collection;
-import java.util.List;
 
 @Builder
 public class Forest<Y> {

src/main/java/ca/joeltherrien/randomforest/tree/ForestTrainer.java

@@ -1,8 +1,7 @@
 package ca.joeltherrien.randomforest.tree;
 
 import ca.joeltherrien.randomforest.Bootstrapper;
-import ca.joeltherrien.randomforest.Covariate;
+import ca.joeltherrien.randomforest.covariates.Covariate;
-import ca.joeltherrien.randomforest.ResponseCombiner;
 import ca.joeltherrien.randomforest.Row;
 import lombok.Builder;
 

src/main/java/ca/joeltherrien/randomforest/tree/ResponseCombiner.java

@@ -1,4 +1,4 @@
-package ca.joeltherrien.randomforest;
+package ca.joeltherrien.randomforest.tree;
 
 import java.util.List;
 import java.util.stream.Collector;

src/main/java/ca/joeltherrien/randomforest/tree/Split.java

@@ -1,5 +1,6 @@
-package ca.joeltherrien.randomforest;
+package ca.joeltherrien.randomforest.tree;
 
+import ca.joeltherrien.randomforest.Row;
 import lombok.Data;
 
 import java.util.List;

src/main/java/ca/joeltherrien/randomforest/tree/SplitNode.java

@@ -1,6 +1,6 @@
 package ca.joeltherrien.randomforest.tree;
 
-import ca.joeltherrien.randomforest.Covariate;
+import ca.joeltherrien.randomforest.covariates.Covariate;
 import ca.joeltherrien.randomforest.CovariateRow;
 import lombok.Builder;
 

src/main/java/ca/joeltherrien/randomforest/tree/TreeTrainer.java

@@ -1,6 +1,7 @@
 package ca.joeltherrien.randomforest.tree;
 
 import ca.joeltherrien.randomforest.*;
+import ca.joeltherrien.randomforest.covariates.Covariate;
 import lombok.Builder;
 
 import java.util.*;

src/test/java/ca/joeltherrien/randomforest/covariates/FactorCovariateTest.java

@@ -1,7 +1,6 @@
 package ca.joeltherrien.randomforest.covariates;
 
 
-import ca.joeltherrien.randomforest.FactorCovariate;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.function.Executable;
 

src/test/java/ca/joeltherrien/randomforest/workshop/TrainForest.java

@@ -1,15 +1,14 @@
 package ca.joeltherrien.randomforest.workshop;
 
 import ca.joeltherrien.randomforest.*;
+import ca.joeltherrien.randomforest.covariates.Covariate;
+import ca.joeltherrien.randomforest.covariates.NumericCovariate;
 import ca.joeltherrien.randomforest.regression.MeanResponseCombiner;
 import ca.joeltherrien.randomforest.regression.WeightedVarianceGroupDifferentiator;
-import ca.joeltherrien.randomforest.tree.Forest;
 import ca.joeltherrien.randomforest.tree.ForestTrainer;
 import ca.joeltherrien.randomforest.tree.TreeTrainer;
 
 import java.util.*;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
 
 public class TrainForest {
 

src/test/java/ca/joeltherrien/randomforest/workshop/TrainSingleTree.java

@@ -1,9 +1,9 @@
 package ca.joeltherrien.randomforest.workshop;
 
 
-import ca.joeltherrien.randomforest.Covariate;
+import ca.joeltherrien.randomforest.covariates.Covariate;
 import ca.joeltherrien.randomforest.CovariateRow;
-import ca.joeltherrien.randomforest.NumericCovariate;
+import ca.joeltherrien.randomforest.covariates.NumericCovariate;
 import ca.joeltherrien.randomforest.Row;
 import ca.joeltherrien.randomforest.regression.MeanResponseCombiner;
 import ca.joeltherrien.randomforest.regression.WeightedVarianceGroupDifferentiator;

src/test/java/ca/joeltherrien/randomforest/workshop/TrainSingleTreeFactor.java

@@ -2,6 +2,9 @@ package ca.joeltherrien.randomforest.workshop;
 
 
 import ca.joeltherrien.randomforest.*;
+import ca.joeltherrien.randomforest.covariates.Covariate;
+import ca.joeltherrien.randomforest.covariates.FactorCovariate;
+import ca.joeltherrien.randomforest.covariates.NumericCovariate;
 import ca.joeltherrien.randomforest.regression.MeanResponseCombiner;
 import ca.joeltherrien.randomforest.regression.WeightedVarianceGroupDifferentiator;
 import ca.joeltherrien.randomforest.tree.Node;
@@ -13,7 +16,6 @@ import java.util.Map;
 import java.util.Random;
 import java.util.stream.Collectors;
 import java.util.stream.DoubleStream;
-import java.util.stream.Stream;
 
 public class TrainSingleTreeFactor {