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<div class="subTitle">org.apache.mahout.cf.taste.impl.model.hbase</div>
<h2 title="Class HBaseDataModel" class="title">Class HBaseDataModel</h2>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <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="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/Refreshable.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">Refreshable</a>, <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.model">DataModel</a></dd>
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<pre>public final class <span class="typeNameLabel">HBaseDataModel</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="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.model">DataModel</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre>
<div class="block"><p>Naive approach of storing one preference as one value in the table.
Preferences are indexed as (user, item) and (item, user) for O(1) lookups.</p>
<p>The default table name is "taste", this can be set through a constructor
argument. Each row has a value starting with "i" or "u" followed by the
actual id encoded as a big endian long.</p>
<p>E.g., "u\x00\x00\x00\x00\x00\x00\x04\xd2" is user 1234L</p>
<p>There are two column families: "users" and "items".</p>
<p>The "users" column family holds user->item preferences. Each userID is the
column qualifier and the value is the preference.</p>
<p>The "items" column fmaily holds item->user preferences. Each itemID is the
column qualifier and the value is the preference.</p>
<p>User IDs and item IDs are cached in a FastIDSet since it requires a full
table scan to build these sets. Preferences are not cached since they
are pretty cheap lookups in HBase (also caching the Preferences defeats
the purpose of a scalable storage engine like HBase).</p></div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../../../serialized-form.html#org.apache.mahout.cf.taste.impl.model.hbase.HBaseDataModel">Serialized Form</a></dd>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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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/model/hbase/HBaseDataModel.html#HBaseDataModel-org.apache.hadoop.hbase.client.HTablePool-java.lang.String-org.apache.hadoop.conf.Configuration-">HBaseDataModel</a></span>(org.apache.hadoop.hbase.client.HTablePool&nbsp;pool,
<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;tableName,
org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/model/hbase/HBaseDataModel.html#HBaseDataModel-java.lang.String-">HBaseDataModel</a></span>(<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;zkConnect)</code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/model/hbase/HBaseDataModel.html#HBaseDataModel-java.lang.String-java.lang.String-">HBaseDataModel</a></span>(<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;zkConnect,
<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;tableName)</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>
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<tr id="i0" 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/hbase/HBaseDataModel.html#close--">close</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html?is-external=true" title="class or 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/hbase/HBaseDataModel.html#getItemIDs--">getItemIDs</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/impl/common/FastIDSet.html?is-external=true" title="class or interface 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/hbase/HBaseDataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i3" 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/hbase/HBaseDataModel.html#getMaxPreference--">getMaxPreference</a></span>()</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/hbase/HBaseDataModel.html#getMinPreference--">getMinPreference</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" 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/hbase/HBaseDataModel.html#getNumItems--">getNumItems</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/hbase/HBaseDataModel.html#getNumUsers--">getNumUsers</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/hbase/HBaseDataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a></span>(long&nbsp;itemID)</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/hbase/HBaseDataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a></span>(long&nbsp;itemID1,
long&nbsp;itemID2)</code>&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/PreferenceArray.html?is-external=true" title="class or 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/hbase/HBaseDataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a></span>(long&nbsp;itemID)</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/PreferenceArray.html?is-external=true" title="class or 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/hbase/HBaseDataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<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/hbase/HBaseDataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a></span>(long&nbsp;userID,
long&nbsp;itemID)</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/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/hbase/HBaseDataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>&nbsp;</td>
</tr>
<tr id="i13" 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/model/hbase/HBaseDataModel.html#getTableName--">getTableName</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html?is-external=true" title="class or 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/hbase/HBaseDataModel.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/hbase/HBaseDataModel.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/hbase/HBaseDataModel.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="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/Refreshable.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">Refreshable</a>&gt;&nbsp;alreadyRefreshed)</code>&nbsp;</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/hbase/HBaseDataModel.html#removePreference-long-long-">removePreference</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>&nbsp;</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/hbase/HBaseDataModel.html#setPreference-long-long-float-">setPreference</a></span>(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;value)</code>&nbsp;</td>
</tr>
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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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<h4>HBaseDataModel</h4>
<pre>public&nbsp;HBaseDataModel(<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;zkConnect)
throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>HBaseDataModel</h4>
<pre>public&nbsp;HBaseDataModel(<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;zkConnect,
<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;tableName)
throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>HBaseDataModel</h4>
<pre>public&nbsp;HBaseDataModel(org.apache.hadoop.hbase.client.HTablePool&nbsp;pool,
<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;tableName,
org.apache.hadoop.conf.Configuration&nbsp;conf)
throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>public&nbsp;<a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a>&nbsp;getUserIDs()</pre>
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<pre>public&nbsp;<a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/PreferenceArray.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;getPreferencesFromUser(long&nbsp;userID)
throws <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<pre>public&nbsp;<a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/impl/common/FastIDSet.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.impl.common">FastIDSet</a>&nbsp;getItemIDsFromUser(long&nbsp;userID)
throws <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<pre>public&nbsp;<a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a>&nbsp;getItemIDs()</pre>
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<pre>public&nbsp;<a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/PreferenceArray.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;getPreferencesForItem(long&nbsp;itemID)
throws <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></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="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<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="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<pre>public&nbsp;int&nbsp;getNumUsersWithPreferenceFor(long&nbsp;itemID)
throws <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<pre>public&nbsp;int&nbsp;getNumUsersWithPreferenceFor(long&nbsp;itemID1,
long&nbsp;itemID2)
throws <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<pre>public&nbsp;void&nbsp;setPreference(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;value)
throws <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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<pre>public&nbsp;void&nbsp;removePreference(long&nbsp;userID,
long&nbsp;itemID)
throws <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></pre>
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<dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/common/TasteException.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.common">TasteException</a></code></dd>
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