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| <div class="subTitle">org.apache.mahout.cf.taste.impl.model.cassandra</div> |
| <h2 title="Class CassandraDataModel" class="title">Class CassandraDataModel</h2> |
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| <li>org.apache.mahout.cf.taste.impl.model.cassandra.CassandraDataModel</li> |
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| <pre>public final class <span class="typeNameLabel">CassandraDataModel</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>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"><code>DataModel</code></a> based on a Cassandra keyspace. By default it uses keyspace "recommender" but this |
| can be configured. Create the keyspace before using this class; this can be done on the Cassandra command |
| line with a command linke <code>create keyspace recommender;</code>.</p> |
| |
| <p>Within the keyspace, this model uses four column families:</p> |
| |
| <p>First, it uses a column family called "users". This is keyed by the user ID as an 8-byte long. |
| It contains a column for every preference the user expresses. The column name is item ID, again as |
| an 8-byte long, and value is a floating point value represnted as an IEEE 32-bit floating poitn value.</p> |
| |
| <p>It uses an analogous column family called "items" for the same data, but keyed by item ID rather |
| than user ID. In this column family, column names are user IDs instead.</p> |
| |
| <p>It uses a column family called "userIDs" as well, with an identical schema. It has one row under key |
| 0. IT contains a column for every user ID in th emodel. It has no values.</p> |
| |
| <p>Finally it also uses an analogous column family "itemIDs" containing item IDs.</p> |
| |
| <p>Each of these four column families needs to be created ahead of time. Again the |
| Cassandra CLI can be used to do so, with commands like <code>create column family users;</code>.</p> |
| |
| <p>Note that this thread uses a long-lived Cassandra client which will run until terminated. You |
| must <a href="../../../../../../../../org/apache/mahout/cf/taste/impl/model/cassandra/CassandraDataModel.html#close--"><code>close()</code></a> this implementation when done or the JVM will not terminate.</p> |
| |
| <p>This implementation still relies heavily on reading data into memory and caching, |
| as it remains too data-intensive to be effective even against Cassandra. It will take some time to |
| "warm up" as the first few requests will block loading user and item data into caches. This is still going |
| to send a great deal of query traffic to Cassandra. It would be advisable to employ caching wrapper |
| classes in your implementation, like <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/impl/recommender/CachingRecommender.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.impl.recommender"><code>CachingRecommender</code></a> |
| or <a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/impl/similarity/CachingItemSimilarity.html?is-external=true" title="class or interface in org.apache.mahout.cf.taste.impl.similarity"><code>CachingItemSimilarity</code></a>.</p></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../../serialized-form.html#org.apache.mahout.cf.taste.impl.model.cassandra.CassandraDataModel">Serialized Form</a></dd> |
| </dl> |
| </li> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/model/cassandra/CassandraDataModel.html#CassandraDataModel--">CassandraDataModel</a></span>()</code> |
| <div class="block">Uses the standard Cassandra host and port (localhost:9160), and keyspace name ("recommender").</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/model/cassandra/CassandraDataModel.html#CassandraDataModel-java.lang.String-int-java.lang.String-">CassandraDataModel</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> host, |
| int port, |
| <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> keyspaceName)</code> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <li class="blockList"><a name="method.summary"> |
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| <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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete 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>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/model/cassandra/CassandraDataModel.html#close--">close</a></span>()</code> </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/cassandra/CassandraDataModel.html#getItemIDs--">getItemIDs</a></span>()</code> </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/cassandra/CassandraDataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a></span>(long userID)</code> </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/cassandra/CassandraDataModel.html#getMaxPreference--">getMaxPreference</a></span>()</code> </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/cassandra/CassandraDataModel.html#getMinPreference--">getMinPreference</a></span>()</code> </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/cassandra/CassandraDataModel.html#getNumItems--">getNumItems</a></span>()</code> </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/cassandra/CassandraDataModel.html#getNumUsers--">getNumUsers</a></span>()</code> </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/cassandra/CassandraDataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a></span>(long itemID)</code> </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/cassandra/CassandraDataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a></span>(long itemID1, |
| long itemID2)</code> </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/cassandra/CassandraDataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a></span>(long itemID)</code> </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/cassandra/CassandraDataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a></span>(long userID)</code> </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/cassandra/CassandraDataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a></span>(long userID, |
| long itemID)</code> </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/cassandra/CassandraDataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a></span>(long userID, |
| long itemID)</code> </td> |
| </tr> |
| <tr id="i13" 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/cassandra/CassandraDataModel.html#getUserIDs--">getUserIDs</a></span>()</code> </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/mahout/cf/taste/impl/model/cassandra/CassandraDataModel.html#hasPreferenceValues--">hasPreferenceValues</a></span>()</code> </td> |
| </tr> |
| <tr id="i15" 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/cassandra/CassandraDataModel.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><<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>> alreadyRefreshed)</code> </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/cassandra/CassandraDataModel.html#removePreference-long-long-">removePreference</a></span>(long userID, |
| long itemID)</code> </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/cassandra/CassandraDataModel.html#setPreference-long-long-float-">setPreference</a></span>(long userID, |
| long itemID, |
| float value)</code> </td> |
| </tr> |
| <tr id="i18" class="altColor"> |
| <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/cassandra/CassandraDataModel.html#toString--">toString</a></span>()</code> </td> |
| </tr> |
| </table> |
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| <!-- --> |
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| <h3>Methods inherited from class 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#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> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="CassandraDataModel--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>CassandraDataModel</h4> |
| <pre>public CassandraDataModel()</pre> |
| <div class="block">Uses the standard Cassandra host and port (localhost:9160), and keyspace name ("recommender").</div> |
| </li> |
| </ul> |
| <a name="CassandraDataModel-java.lang.String-int-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>CassandraDataModel</h4> |
| <pre>public CassandraDataModel(<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> host, |
| int port, |
| <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> keyspaceName)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>host</code> - Cassandra server host name</dd> |
| <dd><code>port</code> - Cassandra server port</dd> |
| <dd><code>keyspaceName</code> - name of Cassandra keyspace to use</dd> |
| </dl> |
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| <pre>public <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> getPreferencesFromUser(long 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/model/DataModel.html?is-external=true#getPreferencesFromUser-long-" title="class or interface in org.apache.mahout.cf.taste.model">getPreferencesFromUser</a></code> in interface <code><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></code></dd> |
| <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 <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> getItemIDsFromUser(long 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/model/DataModel.html?is-external=true#getItemIDsFromUser-long-" title="class or interface in org.apache.mahout.cf.taste.model">getItemIDsFromUser</a></code> in interface <code><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></code></dd> |
| <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 <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> getItemIDs()</pre> |
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| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#getItemIDs--" title="class or interface in org.apache.mahout.cf.taste.model">getItemIDs</a></code> in interface <code><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></code></dd> |
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| <pre>public <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> getPreferencesForItem(long 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="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#getPreferencesForItem-long-" title="class or interface in org.apache.mahout.cf.taste.model">getPreferencesForItem</a></code> in interface <code><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></code></dd> |
| <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 <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> getPreferenceValue(long userID, |
| long itemID)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#getPreferenceValue-long-long-" title="class or interface in org.apache.mahout.cf.taste.model">getPreferenceValue</a></code> in interface <code><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></code></dd> |
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| long itemID)</pre> |
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| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#getPreferenceTime-long-long-" title="class or interface in org.apache.mahout.cf.taste.model">getPreferenceTime</a></code> in interface <code><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></code></dd> |
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| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#getNumItems--" title="class or interface in org.apache.mahout.cf.taste.model">getNumItems</a></code> in interface <code><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></code></dd> |
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| <pre>public int getNumUsers()</pre> |
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| <pre>public int getNumUsersWithPreferenceFor(long 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="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#getNumUsersWithPreferenceFor-long-" title="class or interface in org.apache.mahout.cf.taste.model">getNumUsersWithPreferenceFor</a></code> in interface <code><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></code></dd> |
| <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 int getNumUsersWithPreferenceFor(long itemID1, |
| long 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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| <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 void setPreference(long userID, |
| long itemID, |
| float value)</pre> |
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| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#setPreference-long-long-float-" title="class or interface in org.apache.mahout.cf.taste.model">setPreference</a></code> in interface <code><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></code></dd> |
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| <pre>public void removePreference(long userID, |
| long itemID)</pre> |
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| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#removePreference-long-long-" title="class or interface in org.apache.mahout.cf.taste.model">removePreference</a></code> in interface <code><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></code></dd> |
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| <pre>public boolean hasPreferenceValues()</pre> |
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| <dd><code><a href="http://mahout.apache.org/mahout-mr/apidocs/org/apache/mahout/cf/taste/model/DataModel.html?is-external=true#hasPreferenceValues--" title="class or interface in org.apache.mahout.cf.taste.model">hasPreferenceValues</a></code> in interface <code><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></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true</dd> |
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| <pre>public float getMaxPreference()</pre> |
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| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Float#NaN</dd> |
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| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Float#NaN</dd> |
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| <pre>public <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> toString()</pre> |
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| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code> in interface <code><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></code></dd> |
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