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| <div class="subTitle">org.apache.mahout.cf.taste.impl.recommender</div> |
| <h2 title="Class ItemAverageRecommender" class="title">Class ItemAverageRecommender</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">org.apache.mahout.cf.taste.impl.recommender.AbstractRecommender</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.mahout.cf.taste.impl.recommender.ItemAverageRecommender</li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender">Recommender</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public final class <span class="typeNameLabel">ItemAverageRecommender</span> |
| extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractRecommender</a></pre> |
| <div class="block"><p> |
| A simple recommender that always estimates preference for an item to be the average of all known preference |
| values for that item. No information about users is taken into account. This implementation is provided for |
| experimentation; while simple and fast, it may not produce very good recommendations. |
| </p></div> |
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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/recommender/ItemAverageRecommender.html#ItemAverageRecommender-org.apache.mahout.cf.taste.model.DataModel-">ItemAverageRecommender</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel)</code> </td> |
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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>float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/ItemAverageRecommender.html#estimatePreference-long-long-">estimatePreference</a></span>(long userID, |
| long itemID)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/mahout/cf/taste/recommender/RecommendedItem.html" title="interface in org.apache.mahout.cf.taste.recommender">RecommendedItem</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/ItemAverageRecommender.html#recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-boolean-">recommend</a></span>(long userID, |
| int howMany, |
| <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/IDRescorer.html" title="interface in org.apache.mahout.cf.taste.recommender">IDRescorer</a> rescorer, |
| boolean includeKnownItems)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/ItemAverageRecommender.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="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>> alreadyRefreshed)</code> |
| <div class="block"> |
| Triggers "refresh" -- whatever that means -- of the implementation.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/ItemAverageRecommender.html#removePreference-long-long-">removePreference</a></span>(long userID, |
| long itemID)</code> |
| <div class="block"> |
| Default implementation which just calls <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#removePreference-long-long-"><code>DataModel.removePreference(long, long)</code></a> (Object, Object)}.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/ItemAverageRecommender.html#setPreference-long-long-float-">setPreference</a></span>(long userID, |
| long itemID, |
| float value)</code> |
| <div class="block"> |
| Default implementation which just calls <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#setPreference-long-long-float-"><code>DataModel.setPreference(long, long, float)</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i5" 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/recommender/ItemAverageRecommender.html#toString--">toString</a></span>()</code> </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a name="methods.inherited.from.class.org.apache.mahout.cf.taste.impl.recommender.AbstractRecommender"> |
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| </a> |
| <h3>Methods inherited from class org.apache.mahout.cf.taste.impl.recommender.<a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractRecommender</a></h3> |
| <code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#getAllOtherItems-long-org.apache.mahout.cf.taste.model.PreferenceArray-boolean-">getAllOtherItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#getDataModel--">getDataModel</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#getDefaultCandidateItemsStrategy--">getDefaultCandidateItemsStrategy</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#recommend-long-int-">recommend</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#recommend-long-int-boolean-">recommend</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-">recommend</a></code></li> |
| </ul> |
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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> |
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| <div class="details"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="ItemAverageRecommender-org.apache.mahout.cf.taste.model.DataModel-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>ItemAverageRecommender</h4> |
| <pre>public ItemAverageRecommender(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel) |
| 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="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="recommend-long-int-org.apache.mahout.cf.taste.recommender.IDRescorer-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>recommend</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/mahout/cf/taste/recommender/RecommendedItem.html" title="interface in org.apache.mahout.cf.taste.recommender">RecommendedItem</a>> recommend(long userID, |
| int howMany, |
| <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/IDRescorer.html" title="interface in org.apache.mahout.cf.taste.recommender">IDRescorer</a> rescorer, |
| boolean includeKnownItems) |
| 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="paramLabel">Parameters:</span></dt> |
| <dd><code>userID</code> - user for which recommendations are to be computed</dd> |
| <dd><code>howMany</code> - desired number of recommendations</dd> |
| <dd><code>rescorer</code> - rescoring function to apply before final list of recommendations is determined</dd> |
| <dd><code>includeKnownItems</code> - whether to include items already known by the user in recommendations</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util"><code>List</code></a> of recommended <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/RecommendedItem.html" title="interface in org.apache.mahout.cf.taste.recommender"><code>RecommendedItem</code></a>s, ordered from most strongly recommend to |
| least</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 <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="estimatePreference-long-long-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>estimatePreference</h4> |
| <pre>public float estimatePreference(long userID, |
| long 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="paramLabel">Parameters:</span></dt> |
| <dd><code>userID</code> - user ID whose preference is to be estimated</dd> |
| <dd><code>itemID</code> - item ID to estimate preference for</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an estimated preference if the user has not expressed a preference for the item, or else the |
| user's actual preference for the item. If a preference cannot be estimated, returns |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Double.html?is-external=true#NaN" title="class or interface in java.lang"><code>Double.NaN</code></a></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 <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setPreference-long-long-float-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setPreference</h4> |
| <pre>public void setPreference(long userID, |
| long itemID, |
| float 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 class: <code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#setPreference-long-long-float-">AbstractRecommender</a></code></span></div> |
| <div class="block"><p> |
| Default implementation which just calls <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#setPreference-long-long-float-"><code>DataModel.setPreference(long, long, float)</code></a>. |
| </p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#setPreference-long-long-float-">setPreference</a></code> in interface <code><a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender">Recommender</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#setPreference-long-long-float-">setPreference</a></code> in class <code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractRecommender</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/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code> - if an error occurs while accessing the <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="removePreference-long-long-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>removePreference</h4> |
| <pre>public void removePreference(long userID, |
| long 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 class: <code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#removePreference-long-long-">AbstractRecommender</a></code></span></div> |
| <div class="block"><p> |
| Default implementation which just calls <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#removePreference-long-long-"><code>DataModel.removePreference(long, long)</code></a> (Object, Object)}. |
| </p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html#removePreference-long-long-">removePreference</a></code> in interface <code><a href="../../../../../../../org/apache/mahout/cf/taste/recommender/Recommender.html" title="interface in org.apache.mahout.cf.taste.recommender">Recommender</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html#removePreference-long-long-">removePreference</a></code> in class <code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractRecommender.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractRecommender</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 for which to remove preference</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 <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model"><code>DataModel</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="refresh-java.util.Collection-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>refresh</h4> |
| <pre>public void 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><<a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>> alreadyRefreshed)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <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="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> |
| <a name="toString--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>toString</h4> |
| <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> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><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></code> in class <code><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></code></dd> |
| </dl> |
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