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| <h2 title="Class AbstractDataModel" class="title">Class AbstractDataModel</h2> |
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| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/file/FileDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model.file">FileDataModel</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericBooleanPrefDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">GenericBooleanPrefDataModel</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/GenericDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">GenericDataModel</a></dd> |
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| <pre>public abstract class <span class="typeNameLabel">AbstractDataModel</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">Contains some features common to all implementations.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../serialized-form.html#org.apache.mahout.cf.taste.impl.model.AbstractDataModel">Serialized Form</a></dd> |
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| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html#AbstractDataModel--">AbstractDataModel</a></span>()</code> </td> |
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| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" 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/AbstractDataModel.html#getMaxPreference--">getMaxPreference</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" 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/AbstractDataModel.html#getMinPreference--">getMinPreference</a></span>()</code> </td> |
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| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html#setMaxPreference-float-">setMaxPreference</a></span>(float maxPreference)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/AbstractDataModel.html#setMinPreference-float-">setMinPreference</a></span>(float minPreference)</code> </td> |
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| <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>Methods inherited from interface org.apache.mahout.cf.taste.model.<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></h3> |
| <code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getItemIDs--">getItemIDs</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumItems--">getNumItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsers--">getNumUsers</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getUserIDs--">getUserIDs</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#hasPreferenceValues--">hasPreferenceValues</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#removePreference-long-long-">removePreference</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#setPreference-long-long-float-">setPreference</a></code></li> |
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| <pre>protected AbstractDataModel()</pre> |
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| <pre>public float 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> in interface <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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| <pre>protected void setMaxPreference(float maxPreference)</pre> |
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| <pre>public float 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> in interface <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> |
| </dl> |
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| <pre>protected void setMinPreference(float minPreference)</pre> |
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