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| <title>Recommender (Mahout Map-Reduce 0.13.0 API)</title> |
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| <div class="subTitle">org.apache.mahout.cf.taste.recommender</div> |
| <h2 title="Interface Recommender" class="title">Interface Recommender</h2> |
| </div> |
| <div class="contentContainer"> |
| <div class="description"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><a href="../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Subinterfaces:</dt> |
| <dd><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/UserBasedRecommender.html" title="interface in org.apache.mahout.cf.taste.recommender">UserBasedRecommender</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/CachingRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">CachingRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericBooleanPrefItemBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">GenericBooleanPrefItemBasedRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericBooleanPrefUserBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">GenericBooleanPrefUserBasedRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericItemBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">GenericItemBasedRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/GenericUserBasedRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">GenericUserBasedRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/ItemAverageRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">ItemAverageRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/ItemUserAverageRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">ItemUserAverageRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/RandomRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">RandomRecommender</a>, <a href="../../../../../../org/apache/mahout/cf/taste/impl/recommender/svd/SVDRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender.svd">SVDRecommender</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public interface <span class="typeNameLabel">Recommender</span> |
| extends <a href="../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a></pre> |
| <div class="block"><p> |
| Implementations of this interface can recommend items for a user. Implementations will likely take |
| advantage of several classes in other packages here to compute this. |
| </p></div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ========== 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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract 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/recommender/Recommender.html#estimatePreference-long-long-">estimatePreference</a></span>(long userID, |
| long itemID)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><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/recommender/Recommender.html#getDataModel--">getDataModel</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <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/recommender/Recommender.html#recommend-long-int-">recommend</a></span>(long userID, |
| int howMany)</code> </td> |
| </tr> |
| <tr id="i3" 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/recommender/Recommender.html#recommend-long-int-boolean-">recommend</a></span>(long userID, |
| int howMany, |
| boolean includeKnownItems)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <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/recommender/Recommender.html#recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-">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)</code> </td> |
| </tr> |
| <tr id="i5" 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/recommender/Recommender.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="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#removePreference-long-long-">removePreference</a></span>(long userID, |
| long itemID)</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#setPreference-long-long-float-">setPreference</a></span>(long userID, |
| long itemID, |
| float value)</code> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.mahout.cf.taste.common.Refreshable"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from interface org.apache.mahout.cf.taste.common.<a href="../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a></h3> |
| <code><a href="../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html#refresh-java.util.Collection-">refresh</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="recommend-long-int-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>recommend</h4> |
| <pre><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) |
| 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> |
| <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="recommend-long-int-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>recommend</h4> |
| <pre><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, |
| 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>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="recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>recommend</h4> |
| <pre><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) |
| 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> |
| <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="recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>recommend</h4> |
| <pre><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-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>estimatePreference</h4> |
| <pre>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> |
| <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="setPreference-long-long-float-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setPreference</h4> |
| <pre>void setPreference(long userID, |
| long itemID, |
| float value) |
| 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 to set preference for</dd> |
| <dd><code>itemID</code> - item to set preference for</dd> |
| <dd><code>value</code> - preference value</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="removePreference-long-long-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>removePreference</h4> |
| <pre>void removePreference(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> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>userID</code> - user from which to remove preference</dd> |
| <dd><code>itemID</code> - item for which to remove preference</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="getDataModel--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getDataModel</h4> |
| <pre><a href="../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> getDataModel()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>underlying <a href="../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a> used by this <a href="../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender"><code>Recommender</code></a> implementation</dd> |
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