cleanup work

spring-security-oauth/src/main/java/org/baeldung/reddit/classifier/RedditClassifier.java

@@ -22,32 +22,24 @@ import com.google.common.base.Splitter;
 import com.google.common.io.Files;
 
 public class RedditClassifier {
-
     public static int GOOD = 0;
     public static int BAD = 1;
-    public static int MIN_SCORE = 10;
+    public static int MIN_SCORE = 7;
+
+    private final int[] trainCount = { 0, 0 };
+    private final int[] evalCount = { 0, 0 };
+    private final int[] correctCount = { 0, 0 };
 
     private final AdaptiveLogisticRegression classifier;
     private final FeatureVectorEncoder titleEncoder;
     private final FeatureVectorEncoder domainEncoder;
-    private CrossFoldLearner learner;
     private final int noOfFeatures;
+
+    private CrossFoldLearner learner;
     private double accuracy;
 
-    private final int[] trainCount = { 0, 0 };
-
-    private final int[] evalCount = { 0, 0 };
-
-    private final int[] correctCount = { 0, 0 };
-
     public RedditClassifier() {
-        noOfFeatures = 1000;
-        classifier = new AdaptiveLogisticRegression(2, 1000, new L2());
-        classifier.setPoolSize(150);
-        titleEncoder = new AdaptiveWordValueEncoder("title");
-        titleEncoder.setProbes(2);
-        domainEncoder = new StaticWordValueEncoder("domain");
-        domainEncoder.setProbes(1);
+        this(150, 1000);
     }
 
     public RedditClassifier(final int poolSize, final int noOfFeatures) {
@@ -60,6 +52,8 @@ public class RedditClassifier {
         domainEncoder.setProbes(1);
     }
 
+    // API
+
     public void trainClassifier(final String fileName) throws IOException {
         final List<NamedVector> vectors = extractVectors(readDataFile(fileName));
         final int size = vectors.size();
@@ -151,25 +145,25 @@ public class RedditClassifier {
         final String title = items[3];
         final String theRootDomain = items[4];
 
-        final String category = extractCategory(Integer.parseInt(numberOfVotes));
-
-        final NamedVector vector = new NamedVector(new RandomAccessSparseVector(noOfFeatures), category);
+        final RandomAccessSparseVector internalVector = new RandomAccessSparseVector(noOfFeatures);
 
         final Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
         cal.setTimeInMillis(Long.parseLong(time) * 1000);
-        vector.set(0, cal.get(Calendar.HOUR_OF_DAY)); // hour of day
+        internalVector.set(0, cal.get(Calendar.HOUR_OF_DAY)); // hour of day
 
-        vector.set(1, Integer.parseInt(numberOfWordInTitle)); // number of words in the title
+        internalVector.set(1, Integer.parseInt(numberOfWordInTitle)); // number of words in the title
 
-        domainEncoder.addToVector(theRootDomain, vector);
+        domainEncoder.addToVector(theRootDomain, internalVector);
         final String[] words = title.split(" ");
         // titleEncoder.setProbes(words.length);
 
         // TODO: use a Java 8 stream with filter and remove the 1 and 2 character words; example: "a", "of", "to"
         for (final String word : words) {
-            titleEncoder.addToVector(word, vector);
+            titleEncoder.addToVector(word, internalVector);
         }
-        return vector;
+
+        final String category = extractCategory(Integer.parseInt(numberOfVotes));
+        return new NamedVector(internalVector, category);
     }
 
     private String extractCategory(final int score) {

spring-security-oauth/src/test/java/org/baeldung/classifier/RedditClassifierTest.java

@@ -33,7 +33,7 @@ public class RedditClassifierTest {
 
     @Test
     public void givenLargerPoolSizeAndFeatures_whenUsingCustomClassifier_thenAccurate() throws IOException {
-        final RedditClassifier classifier = new RedditClassifier(200, 2000);
+        final RedditClassifier classifier = new RedditClassifier(250, 2500);
         classifier.trainClassifier(RedditDataCollector.DATA_FILE);
         final double result = classifier.getAccuracy();
         System.out.println("==== Custom Classifier (large) Accuracy = " + result);