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<div class="subTitle">org.apache.mahout.cf.taste.impl.recommender</div>
<h2 title="Class GenericBooleanPrefItemBasedRecommender" class="title">Class GenericBooleanPrefItemBasedRecommender</h2>
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<ul class="inheritance">
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<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><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender</a></li>
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<li>org.apache.mahout.cf.taste.impl.recommender.GenericBooleanPrefItemBasedRecommender</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/recommender/ItemBasedRecommender.html" title="interface in org.apache.mahout.cf.taste.recommender">ItemBasedRecommender</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender">Recommender</a></dd>
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<pre>public final class <span class="typeNameLabel">GenericBooleanPrefItemBasedRecommender</span>
extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">GenericItemBasedRecommender</a></pre>
<div class="block">A variant on <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender"><code>GenericItemBasedRecommender</code></a> which is appropriate for use when no notion of preference
value exists in the data.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericBooleanPrefUserBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender"><code>GenericBooleanPrefUserBasedRecommender</code></a></dd>
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<h3>Nested classes/interfaces inherited from class&nbsp;org.apache.mahout.cf.taste.impl.recommender.<a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">GenericItemBasedRecommender</a></h3>
<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.MostSimilarEstimator.html" title="class in org.apache.mahout.cf.taste.impl.recommender">GenericItemBasedRecommender.MostSimilarEstimator</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericBooleanPrefItemBasedRecommender.html#GenericBooleanPrefItemBasedRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.similarity.ItemSimilarity-">GenericBooleanPrefItemBasedRecommender</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,
<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/ItemSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">ItemSimilarity</a>&nbsp;similarity)</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/GenericBooleanPrefItemBasedRecommender.html#GenericBooleanPrefItemBasedRecommender-org.apache.mahout.cf.taste.model.DataModel-org.apache.mahout.cf.taste.similarity.ItemSimilarity-org.apache.mahout.cf.taste.recommender.CandidateItemsStrategy-org.apache.mahout.cf.taste.recommender.MostSimilarItemsCandidateItemsStrategy-">GenericBooleanPrefItemBasedRecommender</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,
<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/ItemSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">ItemSimilarity</a>&nbsp;similarity,
<a href="../../../../../../../org/apache/mahout/cf/taste/recommender/CandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">CandidateItemsStrategy</a>&nbsp;candidateItemsStrategy,
<a href="../../../../../../../org/apache/mahout/cf/taste/recommender/MostSimilarItemsCandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">MostSimilarItemsCandidateItemsStrategy</a>&nbsp;mostSimilarItemsCandidateItemsStrategy)</code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>protected float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericBooleanPrefItemBasedRecommender.html#doEstimatePreference-long-org.apache.mahout.cf.taste.model.PreferenceArray-long-">doEstimatePreference</a></span>(long&nbsp;userID,
<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;preferencesFromUser,
long&nbsp;itemID)</code>
<div class="block">This computation is in a technical sense, wrong, since in the domain of "boolean preference users" where
all preference values are 1, this method should only ever return 1.0 or NaN.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericBooleanPrefItemBasedRecommender.html#toString--">toString</a></span>()</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.apache.mahout.cf.taste.impl.recommender.<a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">GenericItemBasedRecommender</a></h3>
<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#estimatePreference-long-long-">estimatePreference</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#getDefaultMostSimilarItemsCandidateItemsStrategy--">getDefaultMostSimilarItemsCandidateItemsStrategy</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#getSimilarity--">getSimilarity</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#mostSimilarItems-long:A-int-">mostSimilarItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#mostSimilarItems-long:A-int-boolean-">mostSimilarItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#mostSimilarItems-long:A-int-org.apache.mahout.cf.taste.recommender.Rescorer-">mostSimilarItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#mostSimilarItems-long:A-int-org.apache.mahout.cf.taste.recommender.Rescorer-boolean-">mostSimilarItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#mostSimilarItems-long-int-">mostSimilarItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#mostSimilarItems-long-int-org.apache.mahout.cf.taste.recommender.Rescorer-">mostSimilarItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-boolean-">recommend</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#recommendedBecause-long-long-int-">recommendedBecause</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html#refresh-java.util.Collection-">refresh</a></code></li>
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<h3>Methods inherited from class&nbsp;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&nbsp;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#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>Methods inherited from interface&nbsp;org.apache.mahout.cf.taste.recommender.<a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender">Recommender</a></h3>
<code><a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#getDataModel--">getDataModel</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#recommend-long-int-">recommend</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#recommend-long-int-boolean-">recommend</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-">recommend</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#removePreference-long-long-">removePreference</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#setPreference-long-long-float-">setPreference</a></code></li>
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<h4>GenericBooleanPrefItemBasedRecommender</h4>
<pre>public&nbsp;GenericBooleanPrefItemBasedRecommender(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel,
<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/ItemSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">ItemSimilarity</a>&nbsp;similarity)</pre>
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<h4>GenericBooleanPrefItemBasedRecommender</h4>
<pre>public&nbsp;GenericBooleanPrefItemBasedRecommender(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel,
<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/ItemSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">ItemSimilarity</a>&nbsp;similarity,
<a href="../../../../../../../org/apache/mahout/cf/taste/recommender/CandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">CandidateItemsStrategy</a>&nbsp;candidateItemsStrategy,
<a href="../../../../../../../org/apache/mahout/cf/taste/recommender/MostSimilarItemsCandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">MostSimilarItemsCandidateItemsStrategy</a>&nbsp;mostSimilarItemsCandidateItemsStrategy)</pre>
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<h4>doEstimatePreference</h4>
<pre>protected&nbsp;float&nbsp;doEstimatePreference(long&nbsp;userID,
<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;preferencesFromUser,
long&nbsp;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">This computation is in a technical sense, wrong, since in the domain of "boolean preference users" where
all preference values are 1, this method should only ever return 1.0 or NaN. This isn't terribly useful
however since it means results can't be ranked by preference value (all are 1). So instead this returns a
sum of similarities.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
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<h4>toString</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
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