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<div class="subTitle">org.apache.mahout.cf.taste.impl.recommender.svd</div>
<h2 title="Class SVDPlusPlusFactorizer" class="title">Class SVDPlusPlusFactorizer</h2>
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<li><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/AbstractFactorizer.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">org.apache.mahout.cf.taste.impl.recommender.svd.AbstractFactorizer</a></li>
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<ul class="inheritance">
<li><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">org.apache.mahout.cf.taste.impl.recommender.svd.RatingSGDFactorizer</a></li>
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<li>org.apache.mahout.cf.taste.impl.recommender.svd.SVDPlusPlusFactorizer</li>
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<dd><a href="../../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/Factorizer.html" title="interface in org.apache.mahout.cf.taste.impl.recommender.svd">Factorizer</a></dd>
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<pre>public final class <span class="typeNameLabel">SVDPlusPlusFactorizer</span>
extends <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">RatingSGDFactorizer</a></pre>
<div class="block">SVD++, an enhancement of classical matrix factorization for rating prediction.
Additionally to using ratings (how did people rate?) for learning, this model also takes into account
who rated what.
Yehuda Koren: Factorization Meets the Neighborhood: a Multifaceted Collaborative Filtering Model, KDD 2008.
http://research.yahoo.com/files/kdd08koren.pdf</div>
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<code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#biasLearningRate">biasLearningRate</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#biasReg">biasReg</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#dataModel">dataModel</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#FEATURE_OFFSET">FEATURE_OFFSET</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#ITEM_BIAS_INDEX">ITEM_BIAS_INDEX</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#itemVectors">itemVectors</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#learningRate">learningRate</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#learningRateDecay">learningRateDecay</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#numFeatures">numFeatures</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#preventOverfitting">preventOverfitting</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#randomNoise">randomNoise</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#USER_BIAS_INDEX">USER_BIAS_INDEX</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#userVectors">userVectors</a></code></li>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDPlusPlusFactorizer.html#SVDPlusPlusFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-double-double-int-double-">SVDPlusPlusFactorizer</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel,
int&nbsp;numFeatures,
double&nbsp;learningRate,
double&nbsp;preventOverfitting,
double&nbsp;randomNoise,
int&nbsp;numIterations,
double&nbsp;learningRateDecay)</code>&nbsp;</td>
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<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDPlusPlusFactorizer.html#SVDPlusPlusFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-int-">SVDPlusPlusFactorizer</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel,
int&nbsp;numFeatures,
int&nbsp;numIterations)</code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/Factorization.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">Factorization</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDPlusPlusFactorizer.html#factorize--">factorize</a></span>()</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDPlusPlusFactorizer.html#prepareTraining--">prepareTraining</a></span>()</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDPlusPlusFactorizer.html#updateParameters-long-long-float-double-">updateParameters</a></span>(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;rating,
double&nbsp;currentLearningRate)</code>&nbsp;</td>
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<code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#shufflePreferences--">shufflePreferences</a></code></li>
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<code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/AbstractFactorizer.html#createFactorization-double:A:A-double:A:A-">createFactorization</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/AbstractFactorizer.html#itemIndex-long-">itemIndex</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/AbstractFactorizer.html#refresh-java.util.Collection-">refresh</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/AbstractFactorizer.html#userIndex-long-">userIndex</a></code></li>
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<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h4>SVDPlusPlusFactorizer</h4>
<pre>public&nbsp;SVDPlusPlusFactorizer(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel,
int&nbsp;numFeatures,
int&nbsp;numIterations)
throws <a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<h4>SVDPlusPlusFactorizer</h4>
<pre>public&nbsp;SVDPlusPlusFactorizer(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel,
int&nbsp;numFeatures,
double&nbsp;learningRate,
double&nbsp;preventOverfitting,
double&nbsp;randomNoise,
int&nbsp;numIterations,
double&nbsp;learningRateDecay)
throws <a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<a name="prepareTraining--">
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<h4>prepareTraining</h4>
<pre>protected&nbsp;void&nbsp;prepareTraining()
throws <a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#prepareTraining--">prepareTraining</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">RatingSGDFactorizer</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<h4>factorize</h4>
<pre>public&nbsp;<a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/Factorization.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">Factorization</a>&nbsp;factorize()
throws <a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/Factorizer.html#factorize--">factorize</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/Factorizer.html" title="interface in org.apache.mahout.cf.taste.impl.recommender.svd">Factorizer</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#factorize--">factorize</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">RatingSGDFactorizer</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<h4>updateParameters</h4>
<pre>protected&nbsp;void&nbsp;updateParameters(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;rating,
double&nbsp;currentLearningRate)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#updateParameters-long-long-float-double-">updateParameters</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">RatingSGDFactorizer</a></code></dd>
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