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From jeast...@apache.org
Subject svn commit: r774566 - in /lucene/mahout/trunk/core/src: main/java/org/apache/mahout/matrix/SparseVector.java main/java/org/apache/mahout/matrix/SquareRootFunction.java test/java/org/apache/mahout/matrix/VectorTest.java
Date Wed, 13 May 2009 22:30:24 GMT
Author: jeastman
Date: Wed May 13 22:30:23 2009
New Revision: 774566

URL: http://svn.apache.org/viewvc?rev=774566&view=rev
Log:
- implemented SparseVector.times optimizations suggested by MAHOUT-66
- implemented unit test thereof which demonstrates 5-10ms improvement when used with
  50,000 cardinality, 1000 random element vectors typical of Text clustering
- SparseVector.optimesTimes = true is the default; consider removing it all later

Modified:
    lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SparseVector.java
    lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SquareRootFunction.java
    lucene/mahout/trunk/core/src/test/java/org/apache/mahout/matrix/VectorTest.java

Modified: lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SparseVector.java
URL: http://svn.apache.org/viewvc/lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SparseVector.java?rev=774566&r1=774565&r2=774566&view=diff
==============================================================================
--- lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SparseVector.java (original)
+++ lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SparseVector.java Wed
May 13 22:30:23 2009
@@ -39,9 +39,10 @@
 
   private Map<Integer, Double> values;
 
-
   private int cardinality;
 
+  public static boolean optimizeTimes = true;
+
   /**
    * Decode a new instance from the argument
    *
@@ -96,19 +97,22 @@
   }
 
   @Override
-  @SuppressWarnings("unchecked")  
+  @SuppressWarnings("unchecked")
   public String asFormatString() {
     StringBuilder out = new StringBuilder();
     out.append("[s").append(cardinality).append(", ");
-    Map.Entry<Integer, Double>[] entries = (Map.Entry<Integer, Double>[]) values.entrySet().toArray(new
Map.Entry[values.size()]);
-    Arrays.sort(entries, new Comparator<Map.Entry<Integer, Double>>(){
+    Map.Entry<Integer, Double>[] entries = (Map.Entry<Integer, Double>[]) values
+        .entrySet().toArray(new Map.Entry[values.size()]);
+    Arrays.sort(entries, new Comparator<Map.Entry<Integer, Double>>() {
       @Override
-      public int compare(Map.Entry<Integer, Double> e1, Map.Entry<Integer, Double>
e2) {
+      public int compare(Map.Entry<Integer, Double> e1,
+          Map.Entry<Integer, Double> e2) {
         return e1.getKey().compareTo(e2.getKey());
       }
     });
     for (Map.Entry<Integer, Double> entry : entries) {
-      out.append(entry.getKey()).append(':').append(entry.getValue()).append(", ");
+      out.append(entry.getKey()).append(':').append(entry.getValue()).append(
+          ", ");
     }
     out.append("] ");
     return out.toString();
@@ -188,15 +192,17 @@
     return new Iterator();
   }
 
-
   @Override
   public boolean equals(Object o) {
-    if (this == o) return true;
-    if (o == null || getClass() != o.getClass()) return false;
+    if (this == o)
+      return true;
+    if (o == null || getClass() != o.getClass())
+      return false;
 
     SparseVector that = (SparseVector) o;
 
-    return cardinality == that.cardinality && (values == null ? that.values == null
: values.equals(that.values));
+    return cardinality == that.cardinality
+        && (values == null ? that.values == null : values.equals(that.values));
   }
 
   @Override
@@ -273,4 +279,42 @@
     this.values = values;
   }
 
+  @Override
+  public Vector times(double x) {
+    Vector result;
+    if (optimizeTimes) {
+      result = like();
+      for (Vector.Element element : this) {
+        double value = element.get();
+        int index = element.index();
+        result.setQuick(index, value * x);
+      }
+    } else {
+      result = copy();
+      for (int i = 0; i < result.cardinality(); i++)
+        result.setQuick(i, getQuick(i) * x);
+    }
+    return result;
+  }
+
+  @Override
+  public Vector times(Vector x) {
+    if (cardinality() != x.cardinality())
+      throw new CardinalityException();
+    Vector result;
+    if (optimizeTimes) {
+      result = like();
+      for (Vector.Element element : this) {
+        double value = element.get();
+        int index = element.index();
+        result.setQuick(index, value * x.getQuick(index));
+      }
+    } else {
+      result = copy();
+      for (int i = 0; i < result.cardinality(); i++)
+        result.setQuick(i, getQuick(i) * x.getQuick(i));
+    }
+    return result;
+  }
+
 }

Modified: lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SquareRootFunction.java
URL: http://svn.apache.org/viewvc/lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SquareRootFunction.java?rev=774566&r1=774565&r2=774566&view=diff
==============================================================================
--- lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SquareRootFunction.java
(original)
+++ lucene/mahout/trunk/core/src/main/java/org/apache/mahout/matrix/SquareRootFunction.java
Wed May 13 22:30:23 2009
@@ -4,7 +4,7 @@
 
   @Override
   public double apply(double arg1) {
-    return Math.sqrt(arg1);
+    return Math.abs(arg1);
   }
 
 }

Modified: lucene/mahout/trunk/core/src/test/java/org/apache/mahout/matrix/VectorTest.java
URL: http://svn.apache.org/viewvc/lucene/mahout/trunk/core/src/test/java/org/apache/mahout/matrix/VectorTest.java?rev=774566&r1=774565&r2=774566&view=diff
==============================================================================
--- lucene/mahout/trunk/core/src/test/java/org/apache/mahout/matrix/VectorTest.java (original)
+++ lucene/mahout/trunk/core/src/test/java/org/apache/mahout/matrix/VectorTest.java Wed May
13 22:30:23 2009
@@ -17,6 +17,9 @@
 
 package org.apache.mahout.matrix;
 
+import java.util.Date;
+import java.util.Random;
+
 import junit.framework.TestCase;
 
 public class VectorTest extends TestCase {
@@ -42,7 +45,6 @@
     assertEquals(result + " does not equal: " + 32, 32.0, result);
   }
 
-
   public void testDenseVector() throws Exception {
     DenseVector vec1 = new DenseVector(3);
     DenseVector vec2 = new DenseVector(3);
@@ -67,17 +69,18 @@
       test[e.index()] = e.get();
     }
 
-    for (int i = 0; i<test.length; i++) {
+    for (int i = 0; i < test.length; i++) {
       assertEquals(apriori[i], test[i]);
     }
   }
 
   public void testEnumeration() throws Exception {
-    double[] apriori = {0, 1, 2, 3, 4};
+    double[] apriori = { 0, 1, 2, 3, 4 };
+
+    doTestEnumeration(apriori, new VectorView(new DenseVector(new double[] {
+        -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }), 2, 5));
 
-    doTestEnumeration(apriori, new VectorView(new DenseVector(new double[]{-2, -1, 0, 1,
2, 3, 4, 5, 6, 7, 8, 9}), 2, 5));
-    
-    doTestEnumeration(apriori, new DenseVector(new double[]{0, 1, 2, 3, 4}));
+    doTestEnumeration(apriori, new DenseVector(new double[] { 0, 1, 2, 3, 4 }));
 
     SparseVector sparse = new SparseVector(5);
     sparse.set(0, 0);
@@ -88,4 +91,59 @@
     doTestEnumeration(apriori, sparse);
   }
 
-}
\ No newline at end of file
+  public void testSparseVectorTimesX() {
+    Random rnd = new Random();
+    Vector v1 = randomSparseVector(rnd);
+    double x = rnd.nextDouble();
+    long t0 = new Date().getTime();
+    SparseVector.optimizeTimes = false;
+    Vector rRef = null;
+    for (int i = 0; i < 10; i++)
+      rRef = v1.times(x);
+    long t1 = new Date().getTime();
+    SparseVector.optimizeTimes = true;
+    Vector rOpt = null;
+    for (int i = 0; i < 10; i++)
+      rOpt = v1.times(x);
+    long t2 = new Date().getTime();
+    long tOpt = t2 - t1;
+    long tRef = t1 - t0;
+    assertTrue(tOpt < tRef);
+    System.out.println("testSparseVectorTimesX tRef=tOpt=" + (tRef - tOpt)
+        + " ms for 10 iterations");
+    for (int i = 0; i < 50000; i++)
+      assertEquals("i=" + i, rRef.getQuick(i), rOpt.getQuick(i));
+  }
+
+  public void testSparseVectorTimesV() {
+    Random rnd = new Random();
+    Vector v1 = randomSparseVector(rnd);
+    Vector v2 = randomSparseVector(rnd);
+    long t0 = new Date().getTime();
+    SparseVector.optimizeTimes = false;
+    Vector rRef = null;
+    for (int i = 0; i < 10; i++)
+      rRef = v1.times(v2);
+    long t1 = new Date().getTime();
+    SparseVector.optimizeTimes = true;
+    Vector rOpt = null;
+    for (int i = 0; i < 10; i++)
+      rOpt = v1.times(v2);
+    long t2 = new Date().getTime();
+    long tOpt = t2 - t1;
+    long tRef = t1 - t0;
+    assertTrue(tOpt < tRef);
+    System.out.println("testSparseVectorTimesV tRef=tOpt=" + (tRef - tOpt)
+        + " ms for 10 iterations");
+    for (int i = 0; i < 50000; i++)
+      assertEquals("i=" + i, rRef.getQuick(i), rOpt.getQuick(i));
+  }
+
+  private Vector randomSparseVector(Random rnd) {
+    SparseVector v1 = new SparseVector(50000);
+    for (int i = 0; i < 1000; i++)
+      v1.setQuick((int) (rnd.nextDouble() * 50000), rnd.nextDouble());
+    return v1;
+  }
+
+}



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