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<div class="subTitle">org.apache.mahout.cf.taste.impl.similarity</div>
<h2 title="Class CachingUserSimilarity" class="title">Class CachingUserSimilarity</h2>
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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/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">UserSimilarity</a></dd>
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<pre>public final class <span class="typeNameLabel">CachingUserSimilarity</span>
extends <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>
implements <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">UserSimilarity</a></pre>
<div class="block">Caches the results from an underlying <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>UserSimilarity</code></a> implementation.</div>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/similarity/CachingUserSimilarity.html#CachingUserSimilarity-org.apache.mahout.cf.taste.similarity.UserSimilarity-org.apache.mahout.cf.taste.model.DataModel-">CachingUserSimilarity</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">UserSimilarity</a>&nbsp;similarity,
<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel)</code>
<div class="block">Creates this on top of the given <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>UserSimilarity</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/similarity/CachingUserSimilarity.html#CachingUserSimilarity-org.apache.mahout.cf.taste.similarity.UserSimilarity-int-">CachingUserSimilarity</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">UserSimilarity</a>&nbsp;similarity,
int&nbsp;maxCacheSize)</code>
<div class="block">Creates this on top of the given <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>UserSimilarity</code></a>.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/similarity/CachingUserSimilarity.html#clearCacheForUser-long-">clearCacheForUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/similarity/CachingUserSimilarity.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>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>&gt;&nbsp;alreadyRefreshed)</code>
<div class="block">
Triggers "refresh" -- whatever that means -- of the implementation.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/similarity/CachingUserSimilarity.html#setPreferenceInferrer-org.apache.mahout.cf.taste.similarity.PreferenceInferrer-">setPreferenceInferrer</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/PreferenceInferrer.html" title="interface in org.apache.mahout.cf.taste.similarity">PreferenceInferrer</a>&nbsp;inferrer)</code>
<div class="block">
Attaches a <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/PreferenceInferrer.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>PreferenceInferrer</code></a> to the <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>UserSimilarity</code></a> implementation.</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/similarity/CachingUserSimilarity.html#userSimilarity-long-long-">userSimilarity</a></span>(long&nbsp;userID1,
long&nbsp;userID2)</code>
<div class="block">
Returns the degree of similarity, of two users, based on the their preferences.</div>
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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#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>Constructor Detail</h3>
<a name="CachingUserSimilarity-org.apache.mahout.cf.taste.similarity.UserSimilarity-org.apache.mahout.cf.taste.model.DataModel-">
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<h4>CachingUserSimilarity</h4>
<pre>public&nbsp;CachingUserSimilarity(<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">UserSimilarity</a>&nbsp;similarity,
<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;dataModel)
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">Creates this on top of the given <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>UserSimilarity</code></a>.
The cache is sized according to properties of the given <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a>.</div>
<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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<a name="CachingUserSimilarity-org.apache.mahout.cf.taste.similarity.UserSimilarity-int-">
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<h4>CachingUserSimilarity</h4>
<pre>public&nbsp;CachingUserSimilarity(<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">UserSimilarity</a>&nbsp;similarity,
int&nbsp;maxCacheSize)</pre>
<div class="block">Creates this on top of the given <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>UserSimilarity</code></a>.
The cache size is capped by the given size.</div>
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<a name="userSimilarity-long-long-">
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<h4>userSimilarity</h4>
<pre>public&nbsp;double&nbsp;userSimilarity(long&nbsp;userID1,
long&nbsp;userID2)
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html#userSimilarity-long-long-">UserSimilarity</a></code></span></div>
<div class="block"><p>
Returns the degree of similarity, of two users, based on the their preferences.
</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html#userSimilarity-long-long-">userSimilarity</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">UserSimilarity</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID1</code> - first user ID</dd>
<dd><code>userID2</code> - second user ID</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>similarity between the users, in [-1,1] or <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> similarity is unknown</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if either user is known to be non-existent in the data</dd>
<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 data</dd>
</dl>
</li>
</ul>
<a name="setPreferenceInferrer-org.apache.mahout.cf.taste.similarity.PreferenceInferrer-">
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<h4>setPreferenceInferrer</h4>
<pre>public&nbsp;void&nbsp;setPreferenceInferrer(<a href="../../../../../../../org/apache/mahout/cf/taste/similarity/PreferenceInferrer.html" title="interface in org.apache.mahout.cf.taste.similarity">PreferenceInferrer</a>&nbsp;inferrer)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html#setPreferenceInferrer-org.apache.mahout.cf.taste.similarity.PreferenceInferrer-">UserSimilarity</a></code></span></div>
<div class="block"><p>
Attaches a <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/PreferenceInferrer.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>PreferenceInferrer</code></a> to the <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>UserSimilarity</code></a> implementation.
</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html#setPreferenceInferrer-org.apache.mahout.cf.taste.similarity.PreferenceInferrer-">setPreferenceInferrer</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/similarity/UserSimilarity.html" title="interface in org.apache.mahout.cf.taste.similarity">UserSimilarity</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>inferrer</code> - <a href="../../../../../../../org/apache/mahout/cf/taste/similarity/PreferenceInferrer.html" title="interface in org.apache.mahout.cf.taste.similarity"><code>PreferenceInferrer</code></a></dd>
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<a name="clearCacheForUser-long-">
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<h4>clearCacheForUser</h4>
<pre>public&nbsp;void&nbsp;clearCacheForUser(long&nbsp;userID)</pre>
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<a name="refresh-java.util.Collection-">
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<h4>refresh</h4>
<pre>public&nbsp;void&nbsp;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>&lt;<a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>&gt;&nbsp;alreadyRefreshed)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html#refresh-java.util.Collection-">Refreshable</a></code></span></div>
<div class="block"><p>
Triggers "refresh" -- whatever that means -- of the implementation. The general contract is that any
<a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common"><code>Refreshable</code></a> should always leave itself in a consistent, operational state, and that the refresh
atomically updates internal state from old to new.
</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html#refresh-java.util.Collection-">refresh</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a></code></dd>
<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>
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