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| <div class="subTitle">org.apache.mahout.cf.taste.impl.recommender.svd</div> |
| <h2 title="Class SVDRecommender" class="title">Class SVDRecommender</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">org.apache.mahout.cf.taste.impl.recommender.AbstractRecommender</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.mahout.cf.taste.impl.recommender.svd.SVDRecommender</li> |
| </ul> |
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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/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender">Recommender</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public final class <span class="typeNameLabel">SVDRecommender</span> |
| extends <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractRecommender</a></pre> |
| <div class="block">A <a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender"><code>Recommender</code></a> that uses matrix factorization (a projection of users |
| and items onto a feature space)</div> |
| </li> |
| </ul> |
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| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| <h3>Constructor Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#SVDRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer-">SVDRecommender</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| <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> factorizer)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#SVDRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer-org.apache.mahout.cf.taste.recommender.CandidateItemsStrategy-">SVDRecommender</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| <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> factorizer, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/CandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">CandidateItemsStrategy</a> candidateItemsStrategy)</code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#SVDRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer-org.apache.mahout.cf.taste.recommender.CandidateItemsStrategy-org.apache.mahout.cf.taste.impl.recommender.svd.PersistenceStrategy-">SVDRecommender</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| <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> factorizer, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/CandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">CandidateItemsStrategy</a> candidateItemsStrategy, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/PersistenceStrategy.html" title="interface in org.apache.mahout.cf.taste.impl.recommender.svd">PersistenceStrategy</a> persistenceStrategy)</code> |
| <div class="block">Create an SVDRecommender using a persistent store to cache factorizations.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#SVDRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer-org.apache.mahout.cf.taste.impl.recommender.svd.PersistenceStrategy-">SVDRecommender</a></span>(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| <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> factorizer, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/PersistenceStrategy.html" title="interface in org.apache.mahout.cf.taste.impl.recommender.svd">PersistenceStrategy</a> persistenceStrategy)</code> |
| <div class="block">Create an SVDRecommender using a persistent store to cache factorizations.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.summary"> |
| <!-- --> |
| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#estimatePreference-long-long-">estimatePreference</a></span>(long userID, |
| long itemID)</code> |
| <div class="block">a preference is estimated by computing the dot-product of the user and item feature vectors</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/RecommendedItem.html" title="interface in org.apache.mahout.cf.taste.recommender">RecommendedItem</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-boolean-">recommend</a></span>(long userID, |
| int howMany, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/IDRescorer.html" title="interface in org.apache.mahout.cf.taste.recommender">IDRescorer</a> rescorer, |
| boolean includeKnownItems)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#refresh-java.util.Collection-">refresh</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>> alreadyRefreshed)</code> |
| <div class="block">Refresh the data model and factorization.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.mahout.cf.taste.impl.recommender.AbstractRecommender"> |
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| </a> |
| <h3>Methods inherited from class org.apache.mahout.cf.taste.impl.recommender.<a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractRecommender</a></h3> |
| <code><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#getAllOtherItems-long-org.apache.mahout.cf.taste.model.PreferenceArray-boolean-">getAllOtherItems</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#getDataModel--">getDataModel</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#getDefaultCandidateItemsStrategy--">getDefaultCandidateItemsStrategy</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#recommend-long-int-">recommend</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#recommend-long-int-boolean-">recommend</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-">recommend</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#removePreference-long-long-">removePreference</a>, <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#setPreference-long-long-float-">setPreference</a></code></li> |
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| <h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <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> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a name="SVDRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer-"> |
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| <h4>SVDRecommender</h4> |
| <pre>public SVDRecommender(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| <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> factorizer) |
| 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="SVDRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer-org.apache.mahout.cf.taste.recommender.CandidateItemsStrategy-"> |
| <!-- --> |
| </a> |
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| <h4>SVDRecommender</h4> |
| <pre>public SVDRecommender(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| <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> factorizer, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/CandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">CandidateItemsStrategy</a> candidateItemsStrategy) |
| 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="SVDRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer-org.apache.mahout.cf.taste.impl.recommender.svd.PersistenceStrategy-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>SVDRecommender</h4> |
| <pre>public SVDRecommender(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| <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> factorizer, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/PersistenceStrategy.html" title="interface in org.apache.mahout.cf.taste.impl.recommender.svd">PersistenceStrategy</a> persistenceStrategy) |
| throws <a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre> |
| <div class="block">Create an SVDRecommender using a persistent store to cache factorizations. A factorization is loaded from the |
| store if present, otherwise a new factorization is computed and saved in the store. |
| |
| The <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#refresh-java.util.Collection-"><code>refresh</code></a> method recomputes the factorization and overwrites the store.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dataModel</code> - </dd> |
| <dd><code>factorizer</code> - </dd> |
| <dd><code>persistenceStrategy</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> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="SVDRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.impl.recommender.svd.Factorizer-org.apache.mahout.cf.taste.recommender.CandidateItemsStrategy-org.apache.mahout.cf.taste.impl.recommender.svd.PersistenceStrategy-"> |
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| </a> |
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| <h4>SVDRecommender</h4> |
| <pre>public SVDRecommender(<a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| <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> factorizer, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/CandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">CandidateItemsStrategy</a> candidateItemsStrategy, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/PersistenceStrategy.html" title="interface in org.apache.mahout.cf.taste.impl.recommender.svd">PersistenceStrategy</a> persistenceStrategy) |
| throws <a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre> |
| <div class="block">Create an SVDRecommender using a persistent store to cache factorizations. A factorization is loaded from the |
| store if present, otherwise a new factorization is computed and saved in the store. |
| |
| The <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html#refresh-java.util.Collection-"><code>refresh</code></a> method recomputes the factorization and overwrites the store.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dataModel</code> - </dd> |
| <dd><code>factorizer</code> - </dd> |
| <dd><code>candidateItemsStrategy</code> - </dd> |
| <dd><code>persistenceStrategy</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> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
| <h3>Method Detail</h3> |
| <a name="recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-boolean-"> |
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| </a> |
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| <h4>recommend</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/RecommendedItem.html" title="interface in org.apache.mahout.cf.taste.recommender">RecommendedItem</a>> recommend(long userID, |
| int howMany, |
| <a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/IDRescorer.html" title="interface in org.apache.mahout.cf.taste.recommender">IDRescorer</a> rescorer, |
| boolean includeKnownItems) |
| 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="paramLabel">Parameters:</span></dt> |
| <dd><code>userID</code> - user for which recommendations are to be computed</dd> |
| <dd><code>howMany</code> - desired number of recommendations</dd> |
| <dd><code>rescorer</code> - rescoring function to apply before final list of recommendations is determined</dd> |
| <dd><code>includeKnownItems</code> - whether to include items already known by the user in recommendations</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util"><code>List</code></a> of recommended <a href="../../../../../../../../org/apache/mahout/cf/taste/recommender/RecommendedItem.html" title="interface in org.apache.mahout.cf.taste.recommender"><code>RecommendedItem</code></a>s, ordered from most strongly recommend to |
| least</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> - if an error occurs while accessing the <a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="estimatePreference-long-long-"> |
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| <h4>estimatePreference</h4> |
| <pre>public float estimatePreference(long userID, |
| long itemID) |
| throws <a href="../../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre> |
| <div class="block">a preference is estimated by computing the dot-product of the user and item feature vectors</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>userID</code> - user ID whose preference is to be estimated</dd> |
| <dd><code>itemID</code> - item ID to estimate preference for</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an estimated preference if the user has not expressed a preference for the item, or else the |
| user's actual preference for the item. If a preference cannot be estimated, returns |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Double.html?is-external=true#NaN" title="class or interface in java.lang"><code>Double.NaN</code></a></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> - if an error occurs while accessing the <a href="../../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="refresh-java.util.Collection-"> |
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| <h4>refresh</h4> |
| <pre>public void refresh(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>> alreadyRefreshed)</pre> |
| <div class="block">Refresh the data model and factorization.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>alreadyRefreshed</code> - <a href="../../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common"><code>Refreshable</code></a>s that are known to have already been |
| refreshed as a result of an initial call to a {#refresh(Collection)} method on some |
| object. This ensure that objects in a refresh dependency graph aren't refreshed twice |
| needlessly.</dd> |
| </dl> |
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