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| <div class="subTitle">org.apache.mahout.cf.taste.similarity</div> |
| <h2 title="Interface PreferenceInferrer" class="title">Interface PreferenceInferrer</h2> |
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| <dt>All Superinterfaces:</dt> |
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| <dd><a href="../../../../../../org/apache/mahout/cf/taste/impl/similarity/AveragingPreferenceInferrer.html" title="class in org.apache.mahout.cf.taste.impl.similarity">AveragingPreferenceInferrer</a></dd> |
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| <pre>public interface <span class="typeNameLabel">PreferenceInferrer</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 compute an inferred preference for a user and an item that the user has |
| not expressed any preference for. This might be an average of other preferences scores from that user, for |
| example. This technique is sometimes called "default voting". |
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| <td class="colFirst"><code>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/cf/taste/similarity/PreferenceInferrer.html#inferPreference-long-long-">inferPreference</a></span>(long userID, |
| long itemID)</code> |
| <div class="block"> |
| Infers the given user's preference value for an item.</div> |
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| <code><a href="../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html#refresh-java.util.Collection-">refresh</a></code></li> |
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| <h4>inferPreference</h4> |
| <pre>float inferPreference(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"><p> |
| Infers the given user's preference value for an item. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>userID</code> - ID of user to infer preference for</dd> |
| <dd><code>itemID</code> - item ID to infer preference for</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>inferred 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 inferring</dd> |
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