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<div class="subTitle">org.apache.mahout.cf.taste.impl.model</div>
<h2 title="Class PlusAnonymousUserDataModel" class="title">Class PlusAnonymousUserDataModel</h2>
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<li>org.apache.mahout.cf.taste.impl.model.PlusAnonymousUserDataModel</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <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/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></dd>
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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousConcurrentUserDataModel</a></dd>
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<pre>public class <span class="typeNameLabel">PlusAnonymousUserDataModel</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/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></pre>
<div class="block"><p>
This <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a> decorator class is useful in a situation where you wish to recommend to a user that
doesn't really exist yet in your actual <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a>. For example maybe you wish to recommend DVDs to
a user who has browsed a few titles on your DVD store site, but, the user is not yet registered.
</p>
<p>
This enables you to temporarily add a temporary user to an existing <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a> in a way that
recommenders can then produce recommendations anyway. To do so, wrap your real implementation in this
class:
</p>
<p>
<pre>
DataModel realModel = ...;
DataModel plusModel = new PlusAnonymousUserDataModel(realModel);
...
ItemSimilarity similarity = new LogLikelihoodSimilarity(realModel); // not plusModel
</pre>
</p>
<p>
But, you may continue to use <code>realModel</code> as input to other components. To recommend, first construct and
set the temporary user information on the model and then simply call the recommender. The
<code>synchronized</code> block exists to remind you that this is of course not thread-safe. Only one set
of temp data can be inserted into the model and used at one time.
</p>
<p>
<pre>
Recommender recommender = ...;
...
synchronized(...) {
PreferenceArray tempPrefs = ...;
plusModel.setTempPrefs(tempPrefs);
recommender.recommend(PlusAnonymousUserDataModel.TEMP_USER_ID, 10);
plusModel.setTempPrefs(null);
}
</pre>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../../serialized-form.html#org.apache.mahout.cf.taste.impl.model.PlusAnonymousUserDataModel">Serialized Form</a></dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#TEMP_USER_ID">TEMP_USER_ID</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#PlusAnonymousUserDataModel-org.apache.mahout.cf.taste.model.DataModel-">PlusAnonymousUserDataModel</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;delegate)</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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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/model/PlusAnonymousUserDataModel.html#clearTempPrefs--">clearTempPrefs</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected <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/impl/model/PlusAnonymousUserDataModel.html#getDelegate--">getDelegate</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getItemIDs--">getItemIDs</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastIDSet.html" title="class in org.apache.mahout.cf.taste.impl.common">FastIDSet</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getMaxPreference--">getMaxPreference</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getMinPreference--">getMinPreference</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getNumItems--">getNumItems</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getNumUsers--">getNumUsers</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a></span>(long&nbsp;itemID)</code>&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a></span>(long&nbsp;itemID1,
long&nbsp;itemID2)</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a></span>(long&nbsp;itemID)</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">Retrieves the time at which a preference value from a user and item was set, if known.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Float.html?is-external=true" title="class or interface in java.lang">Float</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">Retrieves the preference value for a single user and item.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getUserIDs--">getUserIDs</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#hasPreferenceValues--">hasPreferenceValues</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.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>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#removePreference-long-long-">removePreference</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">
Removes a particular preference for a user.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#setPreference-long-long-float-">setPreference</a></span>(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;value)</code>
<div class="block">
Sets a particular preference (item plus rating) for a user.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#setTempPrefs-org.apache.mahout.cf.taste.model.PreferenceArray-">setTempPrefs</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;prefs)</code>&nbsp;</td>
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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>Field Detail</h3>
<a name="TEMP_USER_ID">
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<h4>TEMP_USER_ID</h4>
<pre>public static final&nbsp;long TEMP_USER_ID</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../../constant-values.html#org.apache.mahout.cf.taste.impl.model.PlusAnonymousUserDataModel.TEMP_USER_ID">Constant Field Values</a></dd>
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<h4>PlusAnonymousUserDataModel</h4>
<pre>public&nbsp;PlusAnonymousUserDataModel(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;delegate)</pre>
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<h4>getDelegate</h4>
<pre>protected&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;getDelegate()</pre>
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<h4>setTempPrefs</h4>
<pre>public&nbsp;void&nbsp;setTempPrefs(<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;prefs)</pre>
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<h4>clearTempPrefs</h4>
<pre>public&nbsp;void&nbsp;clearTempPrefs()</pre>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a>&nbsp;getUserIDs()
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getUserIDs--">getUserIDs</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all user IDs in the model, in order</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 data</dd>
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<h4>getPreferencesFromUser</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;getPreferencesFromUser(long&nbsp;userID)
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - ID of user to get prefs for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>user's preferences, ordered by item ID</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 the user does not exist</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>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastIDSet.html" title="class in org.apache.mahout.cf.taste.impl.common">FastIDSet</a>&nbsp;getItemIDsFromUser(long&nbsp;userID)
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - ID of user to get prefs for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>IDs of items user expresses a preference for</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 the user does not exist</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>
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<h4>getItemIDs</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a>&nbsp;getItemIDs()
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getItemIDs--">getItemIDs</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>LongPrimitiveIterator</code></a> of all item IDs in the model, in order</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 data</dd>
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<h4>getPreferencesForItem</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;getPreferencesForItem(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>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID</code> - item ID</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all existing <a href="../../../../../../../org/apache/mahout/cf/taste/model/Preference.html" title="interface in org.apache.mahout.cf.taste.model"><code>Preference</code></a>s expressed for that item, ordered by user ID, as an array</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchItemException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchItemException</a></code> - if the item does not exist</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>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Float.html?is-external=true" title="class or interface in java.lang">Float</a>&nbsp;getPreferenceValue(long&nbsp;userID,
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceValue-long-long-">DataModel</a></code></span></div>
<div class="block">Retrieves the preference value for a single user and item.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user ID to get pref value from</dd>
<dd><code>itemID</code> - item ID to get pref value for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>preference value from the given user for the given item or null if none exists</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 the user does not exist</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>
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<h4>getPreferenceTime</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;getPreferenceTime(long&nbsp;userID,
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceTime-long-long-">DataModel</a></code></span></div>
<div class="block">Retrieves the time at which a preference value from a user and item was set, if known.
Time is expressed in the usual way, as a number of milliseconds since the epoch.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user ID for preference in question</dd>
<dd><code>itemID</code> - item ID for preference in question</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>time at which preference was set or null if no preference exists or its time is not known</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 the user does not exist</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>
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<h4>getNumItems</h4>
<pre>public&nbsp;int&nbsp;getNumItems()
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumItems--">getNumItems</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>total number of items known to the model. This is generally the union of all items preferred by
at least one user but could include more.</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 data</dd>
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<h4>getNumUsers</h4>
<pre>public&nbsp;int&nbsp;getNumUsers()
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsers--">getNumUsers</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>total number of users known to the model.</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 data</dd>
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<pre>public&nbsp;int&nbsp;getNumUsersWithPreferenceFor(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>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID</code> - item ID to check for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of users who have expressed a preference for the item</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 data</dd>
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<pre>public&nbsp;int&nbsp;getNumUsersWithPreferenceFor(long&nbsp;itemID1,
long&nbsp;itemID2)
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="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID1</code> - first item ID to check for</dd>
<dd><code>itemID2</code> - second item ID to check for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of users who have expressed a preference for the items</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 data</dd>
</dl>
</li>
</ul>
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<h4>setPreference</h4>
<pre>public&nbsp;void&nbsp;setPreference(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;value)
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/model/DataModel.html#setPreference-long-long-float-">DataModel</a></code></span></div>
<div class="block"><p>
Sets a particular preference (item plus rating) for a user.
</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#setPreference-long-long-float-">setPreference</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<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/NoSuchItemException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchItemException</a></code> - if the item does not exist</dd>
<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 the user does not exist</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="removePreference-long-long-">
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<li class="blockList">
<h4>removePreference</h4>
<pre>public&nbsp;void&nbsp;removePreference(long&nbsp;userID,
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#removePreference-long-long-">DataModel</a></code></span></div>
<div class="block"><p>
Removes a particular preference for a user.
</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#removePreference-long-long-">removePreference</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user from which to remove preference</dd>
<dd><code>itemID</code> - item to remove preference for</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchItemException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchItemException</a></code> - if the item does not exist</dd>
<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 the user does not exist</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="refresh-java.util.Collection-">
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<ul class="blockList">
<li class="blockList">
<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>
</dl>
</li>
</ul>
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<h4>hasPreferenceValues</h4>
<pre>public&nbsp;boolean&nbsp;hasPreferenceValues()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#hasPreferenceValues--">hasPreferenceValues</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if this implementation actually stores and returns distinct preference values;
that is, if it is not a 'boolean' DataModel</dd>
</dl>
</li>
</ul>
<a name="getMaxPreference--">
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<h4>getMaxPreference</h4>
<pre>public&nbsp;float&nbsp;getMaxPreference()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getMaxPreference--">getMaxPreference</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maximum preference value that is possible in the current problem domain being evaluated. For
example, if the domain is movie ratings on a scale of 1 to 5, this should be 5. While a
<a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender"><code>Recommender</code></a> may estimate a preference value above 5.0, it
isn't "fair" to consider that the system is actually suggesting an impossible rating of, say, 5.4 stars.
In practice the application would cap this estimate to 5.0. Since evaluators evaluate
the difference between estimated and actual value, this at least prevents this effect from unfairly
penalizing a <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender"><code>Recommender</code></a></dd>
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<h4>getMinPreference</h4>
<pre>public&nbsp;float&nbsp;getMinPreference()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getMinPreference--">getMinPreference</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getMaxPreference--"><code>DataModel.getMaxPreference()</code></a></dd>
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