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| <div class="subTitle">org.apache.mahout.cf.taste.impl.recommender.svd</div> |
| <h2 title="Class ParallelSGDFactorizer" class="title">Class ParallelSGDFactorizer</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.ParallelSGDFactorizer</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <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 class <span class="typeNameLabel">ParallelSGDFactorizer</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">Minimalistic implementation of Parallel SGD factorizer based on |
| <a href="http://www.sze.hu/~gtakacs/download/jmlr_2009.pdf"> |
| "Scalable Collaborative Filtering Approaches for Large Recommender Systems"</a> |
| and |
| <a href="hwww.cs.wisc.edu/~brecht/papers/hogwildTR.pdf"> |
| "Hogwild!: A Lock-Free Approach to Parallelizing Stochastic Gradient Descent"</a></div> |
| </li> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>protected static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/ParallelSGDFactorizer.PreferenceShuffler.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">ParallelSGDFactorizer.PreferenceShuffler</a></span></code> </td> |
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| </tr> |
| <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/ParallelSGDFactorizer.html#itemVectors">itemVectors</a></span></code> |
| <div class="block">item features</div> |
| </td> |
| </tr> |
| <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/ParallelSGDFactorizer.html#userVectors">userVectors</a></span></code> |
| <div class="block">user features</div> |
| </td> |
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| </li> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/ParallelSGDFactorizer.html#ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-">ParallelSGDFactorizer</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numEpochs)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/ParallelSGDFactorizer.html#ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-double-double-int-double-">ParallelSGDFactorizer</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numIterations, |
| double mu0, |
| double decayFactor, |
| int stepOffset, |
| double forgettingExponent)</code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/ParallelSGDFactorizer.html#ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-double-double-int-double-double-double-">ParallelSGDFactorizer</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numIterations, |
| double mu0, |
| double decayFactor, |
| int stepOffset, |
| double forgettingExponent, |
| double biasMuRatio, |
| double biasLambdaRatio)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/ParallelSGDFactorizer.html#ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-double-double-int-double-double-double-int-">ParallelSGDFactorizer</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numIterations, |
| double mu0, |
| double decayFactor, |
| int stepOffset, |
| double forgettingExponent, |
| double biasMuRatio, |
| double biasLambdaRatio, |
| int numThreads)</code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/ParallelSGDFactorizer.html#ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-double-double-int-double-int-">ParallelSGDFactorizer</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numIterations, |
| double mu0, |
| double decayFactor, |
| int stepOffset, |
| double forgettingExponent, |
| int numThreads)</code> </td> |
| </tr> |
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| <tr> |
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| <tr id="i0" class="altColor"> |
| <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/ParallelSGDFactorizer.html#factorize--">factorize</a></span>()</code> </td> |
| </tr> |
| <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/ParallelSGDFactorizer.html#initialize--">initialize</a></span>()</code> </td> |
| </tr> |
| <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/ParallelSGDFactorizer.html#update-org.apache.mahout.cf.taste.model.Preference-double-">update</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/Preference.html" title="interface in org.apache.mahout.cf.taste.model">Preference</a> preference, |
| double mu)</code> |
| <div class="block">TODO: this is the vanilla sgd by Tacaks 2009, I speculate that using scaling technique proposed in: |
| Towards Optimal One Pass Large Scale Learning with Averaged Stochastic Gradient Descent section 5, page 6 |
| can be beneficial in term s of both speed and accuracy.</div> |
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| <h3>Methods inherited from class org.apache.mahout.cf.taste.impl.recommender.svd.<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></h3> |
| <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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| <h3>Field Detail</h3> |
| <a name="userVectors"> |
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| <h4>userVectors</h4> |
| <pre>protected volatile double[][] userVectors</pre> |
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| <pre>protected volatile double[][] itemVectors</pre> |
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| <h4>ParallelSGDFactorizer</h4> |
| <pre>public ParallelSGDFactorizer(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numEpochs) |
| 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> |
| </dl> |
| </li> |
| </ul> |
| <a name="ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-double-double-int-double-"> |
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| <h4>ParallelSGDFactorizer</h4> |
| <pre>public ParallelSGDFactorizer(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numIterations, |
| double mu0, |
| double decayFactor, |
| int stepOffset, |
| double forgettingExponent) |
| 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> |
| </dl> |
| </li> |
| </ul> |
| <a name="ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-double-double-int-double-int-"> |
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| <h4>ParallelSGDFactorizer</h4> |
| <pre>public ParallelSGDFactorizer(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numIterations, |
| double mu0, |
| double decayFactor, |
| int stepOffset, |
| double forgettingExponent, |
| int numThreads) |
| 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> |
| </dl> |
| </li> |
| </ul> |
| <a name="ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-double-double-int-double-double-double-"> |
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| <h4>ParallelSGDFactorizer</h4> |
| <pre>public ParallelSGDFactorizer(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numIterations, |
| double mu0, |
| double decayFactor, |
| int stepOffset, |
| double forgettingExponent, |
| double biasMuRatio, |
| double biasLambdaRatio) |
| 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> |
| </dl> |
| </li> |
| </ul> |
| <a name="ParallelSGDFactorizer-org.apache.mahout.cf.taste.model.DataModel-int-double-int-double-double-int-double-double-double-int-"> |
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| <h4>ParallelSGDFactorizer</h4> |
| <pre>public ParallelSGDFactorizer(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| int numFeatures, |
| double lambda, |
| int numIterations, |
| double mu0, |
| double decayFactor, |
| int stepOffset, |
| double forgettingExponent, |
| double biasMuRatio, |
| double biasLambdaRatio, |
| int numThreads) |
| 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> |
| </dl> |
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| <h3>Method Detail</h3> |
| <a name="initialize--"> |
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| <h4>initialize</h4> |
| <pre>protected void initialize() |
| 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> |
| </dl> |
| </li> |
| </ul> |
| <a name="factorize--"> |
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| <h4>factorize</h4> |
| <pre>public <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> 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="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>update</h4> |
| <pre>protected void update(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/Preference.html" title="interface in org.apache.mahout.cf.taste.model">Preference</a> preference, |
| double mu)</pre> |
| <div class="block">TODO: this is the vanilla sgd by Tacaks 2009, I speculate that using scaling technique proposed in: |
| Towards Optimal One Pass Large Scale Learning with Averaged Stochastic Gradient Descent section 5, page 6 |
| can be beneficial in term s of both speed and accuracy. |
| |
| Tacaks' method doesn't calculate gradient of regularization correctly, which has non-zero elements everywhere of |
| the matrix. While Tacaks' method can only updates a single row/column, if one user has a lot of recommendation, |
| her vector will be more affected by regularization using an isolated scaling factor for both user vectors and |
| item vectors can remove this issue without inducing more update cost it even reduces it a bit by only performing |
| one addition and one multiplication. |
| |
| BAD SIDE1: the scaling factor decreases fast, it has to be scaled up from time to time before dropped to zero or |
| caused roundoff error |
| BAD SIDE2: no body experiment on it before, and people generally use very small lambda |
| so it's impact on accuracy may still be unknown. |
| BAD SIDE3: don't know how to make it work for L1-regularization or |
| "pseudorank?" (sum of singular values)-regularization</div> |
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