Merge pull request #196 from Doha2012/master

modify reddit classifier
2015-04-20 10:53:11 +03:00 · 2015-04-20 10:53:11 +03:00 · 608d2dbca9
parent be841b1d6d d752fe77ec
commit 608d2dbca9
5 changed files with 8181 additions and 8161 deletions
--- a/spring-security-oauth/src/main/java/org/baeldung/reddit/classifier/RedditClassifier.java
+++ b/spring-security-oauth/src/main/java/org/baeldung/reddit/classifier/RedditClassifier.java
@ -1,13 +1,17 @@
 package org.baeldung.reddit.classifier;

-import java.io.BufferedReader;
-import java.io.FileReader;
+import java.io.File;
 import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
 import java.util.Calendar;
+import java.util.List;
 import java.util.TimeZone;

+import org.apache.mahout.classifier.sgd.AdaptiveLogisticRegression;
+import org.apache.mahout.classifier.sgd.CrossFoldLearner;
 import org.apache.mahout.classifier.sgd.L2;
-import org.apache.mahout.classifier.sgd.OnlineLogisticRegression;
+import org.apache.mahout.math.NamedVector;
 import org.apache.mahout.math.RandomAccessSparseVector;
 import org.apache.mahout.math.Vector;
 import org.apache.mahout.vectorizer.encoders.AdaptiveWordValueEncoder;
@ -15,22 +19,25 @@ import org.apache.mahout.vectorizer.encoders.FeatureVectorEncoder;
 import org.apache.mahout.vectorizer.encoders.StaticWordValueEncoder;

 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 = 5;
-    private final OnlineLogisticRegression classifier;
+    public static int MIN_SCORE = 10;
+    private final AdaptiveLogisticRegression classifier;
    private final FeatureVectorEncoder titleEncoder;
    private final FeatureVectorEncoder domainEncoder;
+    private CrossFoldLearner learner;

    private final int[] trainCount = { 0, 0 };

    private final int[] evalCount = { 0, 0 };

    public RedditClassifier() {
-        classifier = new OnlineLogisticRegression(2, 4, new L2(1));
+        classifier = new AdaptiveLogisticRegression(2, 4, new L2());
+        classifier.setPoolSize(25);
        titleEncoder = new AdaptiveWordValueEncoder("title");
        titleEncoder.setProbes(1);
        domainEncoder = new StaticWordValueEncoder("domain");
@ -38,27 +45,35 @@ public class RedditClassifier {
    }

    public void trainClassifier(String fileName) throws IOException {
-        final BufferedReader reader = new BufferedReader(new FileReader(fileName));
+        final List<NamedVector> vectors = extractVectors(readDataFile(fileName));
        int category;
-        Vector features;
-        String line = reader.readLine();
-        if (line == null) {
-            new RedditDataCollector().collectData();
-        }
-
-        while ((line != null) && (line != "")) {
-            category = extractCategory(line);
+        for (final NamedVector vector : vectors) {
+            category = (vector.getName() == "GOOD") ? GOOD : BAD;
+            classifier.train(category, vector);
            trainCount[category]++;
-            features = convertLineToVector(line);
-            classifier.train(category, features);
-            line = reader.readLine();
        }
-        reader.close();
        System.out.println("Training count ========= " + trainCount[0] + "___" + trainCount[1]);
    }

-    public int classify(Vector features) {
-        return classifier.classifyFull(features).maxValueIndex();
+    public double evaluateClassifier() throws IOException {
+        final List<NamedVector> vectors = extractVectors(readDataFile(RedditDataCollector.TEST_FILE));
+        int category, result;
+        int correct = 0;
+        int wrong = 0;
+        for (final NamedVector vector : vectors) {
+            category = (vector.getName() == "GOOD") ? GOOD : BAD;
+            result = classify(vector);
+
+            evalCount[category]++;
+            if (category == result) {
+                correct++;
+            } else {
+                wrong++;
+            }
+        }
+        System.out.println(correct + " ----- " + wrong);
+        System.out.println("Eval count ========= " + evalCount[0] + "___" + evalCount[1]);
+        return correct / (wrong + correct + 0.0);
    }

    public Vector convertPost(String title, String domain, int hour) {
@ -71,49 +86,50 @@ public class RedditClassifier {
        return features;
    }

-    public double evaluateClassifier() throws IOException {
-        final BufferedReader reader = new BufferedReader(new FileReader(RedditDataCollector.TEST_FILE));
-        int category, result;
-        int correct = 0;
-        int wrong = 0;
-        Vector features;
-        String line = reader.readLine();
-        while ((line != null) && (line != "")) {
-            category = extractCategory(line);
-            evalCount[category]++;
-            features = convertLineToVector(line);
-            result = classify(features);
-            if (category == result) {
-                correct++;
-            } else {
-                wrong++;
-            }
-            line = reader.readLine();
+    public int classify(Vector features) {
+        if (learner == null) {
+            learner = classifier.getBest().getPayload().getLearner();
        }
-        reader.close();
-        System.out.println(correct + " ----- " + wrong);
-        System.out.println("Eval count ========= " + evalCount[0] + "___" + evalCount[1]);
-        return correct / (wrong + correct + 0.0);
+        return learner.classifyFull(features).maxValueIndex();
    }

-    // ==== private
-    private int extractCategory(String line) {
-        final int score = Integer.parseInt(line.substring(0, line.indexOf(';')));
-        return (score < MIN_SCORE) ? BAD : GOOD;
+    // ==== Private methods
+
+    private List<String> readDataFile(String fileName) throws IOException {
+        List<String> lines = Files.readLines(new File(fileName), Charset.forName("utf-8"));
+        if ((lines == null) || (lines.size() == 0)) {
+            new RedditDataCollector().collectData();
+            lines = Files.readLines(new File(fileName), Charset.forName("utf-8"));
+        }
+        lines.remove(0);
+        return lines;
    }

-    private Vector convertLineToVector(String line) {
-        final Vector features = new RandomAccessSparseVector(4);
-        final String[] items = line.split(";");
+    private List<NamedVector> extractVectors(List<String> lines) {
+        final List<NamedVector> vectors = new ArrayList<NamedVector>(lines.size());
+        for (final String line : lines) {
+            vectors.add(extractVector(line));
+        }
+        return vectors;
+    }
+
+    private NamedVector extractVector(String line) {
+        final String[] items = line.split(",");
+        final String category = extractCategory(Integer.parseInt(items[0]));
+        final NamedVector vector = new NamedVector(new RandomAccessSparseVector(4), category);
        final Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
        cal.setTimeInMillis(Long.parseLong(items[1]) * 1000);
-        final int hour = cal.get(Calendar.HOUR_OF_DAY);

-        titleEncoder.addToVector(items[3], features);
-        domainEncoder.addToVector(items[4], features);
-        features.set(2, hour); // hour of day
-        features.set(3, Integer.parseInt(items[2])); // number of words in the title
-        return features;
+        titleEncoder.addToVector(items[3], vector);
+        domainEncoder.addToVector(items[4], vector);
+        vector.set(2, cal.get(Calendar.HOUR_OF_DAY)); // hour of day
+        vector.set(3, Integer.parseInt(items[2])); // number of words in the title
+
+        return vector;
+    }
+
+    private String extractCategory(int score) {
+        return (score < MIN_SCORE) ? "BAD" : "GOOD";
    }

 }
--- a/spring-security-oauth/src/main/java/org/baeldung/reddit/classifier/RedditDataCollector.java
+++ b/spring-security-oauth/src/main/java/org/baeldung/reddit/classifier/RedditDataCollector.java
@ -47,12 +47,14 @@ public class RedditDataCollector {
        timestamp = System.currentTimeMillis() / 1000;
        try {
            final FileWriter writer = new FileWriter(TRAINING_FILE);
+            writer.write("Score, Timestamp in utc, Number of wrods in title, Title, Domain \n");
            for (int i = 0; i < noOfRounds; i++) {
                getPosts(writer);
            }
            writer.close();

            final FileWriter testWriter = new FileWriter(TEST_FILE);
+            testWriter.write("Score, Timestamp in utc, Number of wrods in title, Title, Domain \n");
            getPosts(testWriter);
            testWriter.close();
        } catch (final Exception e) {
@ -83,9 +85,9 @@ public class RedditDataCollector {
            words = Splitter.onPattern("\\W").omitEmptyStrings().splitToList(child.get("data").get("title").asText());
            timestamp = child.get("data").get("created_utc").asLong();

-            line = score + ";";
-            line += timestamp + ";";
-            line += words.size() + ";" + Joiner.on(' ').join(words) + ";";
+            line = score + ",";
+            line += timestamp + ",";
+            line += words.size() + "," + Joiner.on(' ').join(words) + ",";
            line += child.get("data").get("domain").asText() + "\n";
            writer.write(line);
        }
--- a/spring-security-oauth/src/main/resources/test.csv
+++ b/spring-security-oauth/src/main/resources/test.csv
@ -1,100 +1,101 @@
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-0;1355489352;9;Main difference between Abstract Class and Interface Compilr org;compilr.org
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-10;1355448875;16;Open source applications large small worth looking at in Java I want to understand application structure;self.java
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+Score, Timestamp in utc, Number of wrods in title, Title, Domain 
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+5,1356970069,9,How to Send Email with Embedded Images Using Java,blog.smartbear.com
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+0,1356891056,5,JMeter Performance and Tuning Tips,ubik-ingenierie.com
+12,1356888358,19,First fully functional GUI program about making acronyms easier to remember Was wondering if you guys had any tips,github.com
+2,1356881034,12,Social Tech 101 Why do I love Java Developer Edition Part 1,socialtech101.blogspot.com
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+4,1356631759,12,a java library i saw mentioned here can t find pls help,self.java
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+0,1356593886,2,AffineTransform halp,self.java
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+0,1355851994,5,Eclipse Text Problem Need Help,self.java
+29,1355823193,4,Java 8 vs Xtend,blog.efftinge.de
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+0,1355748318,4,When StackOverflow Goes Bad,blogs.windward.net
+0,1355721981,4,Java Graphics Projectile HELP,self.java
+0,1355719622,12,Which one of the following statements about object oriented programming is false,self.java
+16,1355707814,8,What s the skinny on JavaFX these days,self.java
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+4,1355621071,7,Looking to add test code in Github,self.java
+7,1355613608,6,Java Version of Jarvis Must Haves,self.java
+5,1355599765,6,Java Advent Calendar Functional Java Collections,javaadvent.com
+7,1355597483,13,I m working on a text based RPG and I have some questions,self.java
+2,1355574445,6,Java EE 7 Community Survey Results,blog.eisele.net
+0,1355576629,4,Evolution of Java Technology,compilr.org
+18,1355574828,10,Are your Garbage Collection Logs speaking to you Censum does,blog.eisele.net
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+0,1355489352,9,Main difference between Abstract Class and Interface Compilr org,compilr.org
+48,1355487006,8,Date and Time in Java 8 Part 1,insightfullogic.com
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+10,1355448875,16,Open source applications large small worth looking at in Java I want to understand application structure,self.java
+1,1355444452,4,lo mexor pz xxx,heavy-r.com
+0,1355402889,11,JRebel Remoting to Push Changes to Your Toaster in The Cloud,zeroturnaround.com
+0,1355402734,6,Are bugs part of technical debt,swreflections.blogspot.ca
+2,1355400483,9,Compile and Run Java programs with Sublime Text 2,compilr.org
+0,1355391115,4,console input like craftbukkit,self.java
+7,1355390023,8,Hosting suggestions needed for a java web app,self.java
+6,1355359227,17,Java novice here Have noticed funny performance differences across laptop and desktop Nvidia optimus related Details inside,self.java
+1,1355327090,18,Please advice which java server technology should I choose for this new web app in my new work,self.java
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--- a/spring-security-oauth/src/main/resources/train.csv
+++ b/spring-security-oauth/src/main/resources/train.csv
--- a/spring-security-oauth/src/test/java/org/baeldung/classifier/RedditClassifierTest.java
+++ b/spring-security-oauth/src/test/java/org/baeldung/classifier/RedditClassifierTest.java
@ -7,10 +7,9 @@ import java.io.IOException;
 import org.baeldung.reddit.classifier.RedditClassifier;
 import org.baeldung.reddit.classifier.RedditDataCollector;
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Test;

-@Ignore
+//@Ignore
 public class RedditClassifierTest {

    private RedditClassifier classifier;
@ -27,4 +26,5 @@ public class RedditClassifierTest {
        System.out.println("Accuracy = " + result);
        assertTrue(result > 0.8);
    }
+
 }