docs/0.13.0/api/docs/mahout-mr/org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html - mahout - Git at Google

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 <div class="subTitle">org.apache.mahout.cf.taste.impl.recommender.svd</div>
 <h2 title="Class RatingSGDFactorizer" class="title">Class RatingSGDFactorizer</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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 <li>org.apache.mahout.cf.taste.impl.recommender.svd.RatingSGDFactorizer</li>
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 <dd><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDPlusPlusFactorizer.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">SVDPlusPlusFactorizer</a></dd>
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 <pre>public class <span class="typeNameLabel">RatingSGDFactorizer</span>
 extends <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/AbstractFactorizer.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">AbstractFactorizer</a></pre>
 <div class="block">Matrix factorization with user and item biases for rating prediction, trained with plain vanilla SGD</div>
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 <h3>Field Summary</h3>
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 <caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Field and Description</th>
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 <td class="colFirst"><code>protected double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#biasLearningRate">biasLearningRate</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>protected double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#biasReg">biasReg</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>protected <a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#dataModel">dataModel</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>protected static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#FEATURE_OFFSET">FEATURE_OFFSET</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>protected static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#ITEM_BIAS_INDEX">ITEM_BIAS_INDEX</a></span></code>
 <div class="block">place in item vector where the bias is stored</div>
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 <td class="colFirst"><code>protected double[][]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#itemVectors">itemVectors</a></span></code>
 <div class="block">Item features</div>
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 <td class="colFirst"><code>protected double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#learningRate">learningRate</a></span></code>
 <div class="block">Learning rate (step size)</div>
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 <td class="colFirst"><code>protected double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#learningRateDecay">learningRateDecay</a></span></code>
 <div class="block">Multiplicative decay factor for learning_rate</div>
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 <td class="colFirst"><code>protected int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#numFeatures">numFeatures</a></span></code>
 <div class="block">Number of features used to compute this factorization</div>
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 <td class="colFirst"><code>protected double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#preventOverfitting">preventOverfitting</a></span></code>
 <div class="block">Parameter used to prevent overfitting.</div>
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 <td class="colFirst"><code>protected double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#randomNoise">randomNoise</a></span></code>
 <div class="block">Standard deviation for random initialization of features</div>
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 <td class="colFirst"><code>protected static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#USER_BIAS_INDEX">USER_BIAS_INDEX</a></span></code>
 <div class="block">place in user vector where the bias is stored</div>
 </td>
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 <tr class="altColor">
 <td class="colFirst"><code>protected double[][]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#userVectors">userVectors</a></span></code>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#RatingSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-double-double-int-double-">RatingSGDFactorizer</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,
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/RatingSGDFactorizer.html#RatingSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-int-">RatingSGDFactorizer</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,
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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/RatingSGDFactorizer.html#factorize--">factorize</a></span>()</code>&nbsp;</td>
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 <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/RatingSGDFactorizer.html#prepareTraining--">prepareTraining</a></span>()</code>&nbsp;</td>
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 <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/RatingSGDFactorizer.html#shufflePreferences--">shufflePreferences</a></span>()</code>&nbsp;</td>
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 <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/RatingSGDFactorizer.html#updateParameters-long-long-float-double-">updateParameters</a></span>(long&nbsp;userID,
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 <pre>protected static final&nbsp;int USER_BIAS_INDEX</pre>
 <div class="block">place in user vector where the bias is stored</div>
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 <dd><a href="../../../../../../../../constant-values.html#org.apache.mahout.cf.taste.impl.recommender.svd.RatingSGDFactorizer.USER_BIAS_INDEX">Constant Field Values</a></dd>
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 <pre>protected static final&nbsp;int ITEM_BIAS_INDEX</pre>
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 <dd><a href="../../../../../../../../constant-values.html#org.apache.mahout.cf.taste.impl.recommender.svd.RatingSGDFactorizer.ITEM_BIAS_INDEX">Constant Field Values</a></dd>
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                            double&nbsp;preventOverfitting,
                            double&nbsp;randomNoise,
                            int&nbsp;numIterations,
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