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| <div class="subTitle">org.apache.mahout.cf.taste.impl.recommender</div> |
| <h2 title="Class SamplingCandidateItemsStrategy" class="title">Class SamplingCandidateItemsStrategy</h2> |
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| <li><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html" title="class in org.apache.mahout.cf.taste.impl.recommender">org.apache.mahout.cf.taste.impl.recommender.AbstractCandidateItemsStrategy</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.mahout.cf.taste.impl.recommender.SamplingCandidateItemsStrategy</li> |
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| <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/CandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">CandidateItemsStrategy</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/recommender/MostSimilarItemsCandidateItemsStrategy.html" title="interface in org.apache.mahout.cf.taste.recommender">MostSimilarItemsCandidateItemsStrategy</a></dd> |
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| <pre>public class <span class="typeNameLabel">SamplingCandidateItemsStrategy</span> |
| extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractCandidateItemsStrategy</a></pre> |
| <div class="block"><p>Returns all items that have not been rated by the user <em>(3)</em> and that were preferred by another user |
| <em>(2)</em> that has preferred at least one item <em>(1)</em> that the current user has preferred too.</p> |
| |
| <p>This strategy uses sampling to limit the number of items that are considered, by sampling three different |
| things, noted above:</p> |
| |
| <ol> |
| <li>The items that the user has preferred</li> |
| <li>The users who also prefer each of those items</li> |
| <li>The items those users also prefer</li> |
| </ol> |
| |
| <p>There is a maximum associated with each of these three things; if the number of items or users exceeds |
| that max, it is sampled so that the expected number of items or users actually used in that part of the |
| computation is equal to the max.</p> |
| |
| <p>Three arguments control these three maxima. Each is a "factor" f, which establishes the max at |
| f * log2(n), where n is the number of users or items in the data. For example if factor #2 is 5, |
| which controls the number of users sampled per item, then 5 * log2(# users) is the maximum for this |
| part of the computation.</p> |
| |
| <p>Each can be set to not do any limiting with value <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#NO_LIMIT_FACTOR"><code>NO_LIMIT_FACTOR</code></a>.</p></div> |
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| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#DEFAULT_FACTOR">DEFAULT_FACTOR</a></span></code> |
| <div class="block">Default factor used if not otherwise specified, for all limits.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#NO_LIMIT_FACTOR">NO_LIMIT_FACTOR</a></span></code> |
| <div class="block">Specify this value as a factor to mean no limit.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#SamplingCandidateItemsStrategy-int-int-">SamplingCandidateItemsStrategy</a></span>(int numUsers, |
| int numItems)</code> |
| <div class="block">Defaults to using no limit (<a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#NO_LIMIT_FACTOR"><code>NO_LIMIT_FACTOR</code></a>) for all factors, except |
| <code>candidatesPerUserFactor</code> which defaults to <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#DEFAULT_FACTOR"><code>DEFAULT_FACTOR</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#SamplingCandidateItemsStrategy-int-int-int-int-int-">SamplingCandidateItemsStrategy</a></span>(int itemsFactor, |
| int usersPerItemFactor, |
| int candidatesPerUserFactor, |
| int numUsers, |
| int numItems)</code> </td> |
| </tr> |
| </table> |
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| <td class="colFirst"><code>protected <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/recommender/SamplingCandidateItemsStrategy.html#doGetCandidateItems-long:A-org.apache.mahout.cf.taste.model.DataModel-boolean-">doGetCandidateItems</a></span>(long[] preferredItemIDs, |
| <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| boolean includeKnownItems)</code> </td> |
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| <h3>Methods inherited from class org.apache.mahout.cf.taste.impl.recommender.<a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractCandidateItemsStrategy</a></h3> |
| <code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html#doGetCandidateItems-long:A-org.apache.mahout.cf.taste.model.DataModel-">doGetCandidateItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html#getCandidateItems-long:A-org.apache.mahout.cf.taste.model.DataModel-">getCandidateItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html#getCandidateItems-long-org.apache.mahout.cf.taste.model.PreferenceArray-org.apache.mahout.cf.taste.model.DataModel-boolean-">getCandidateItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html#refresh-java.util.Collection-">refresh</a></code></li> |
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| <h4>DEFAULT_FACTOR</h4> |
| <pre>public static final int DEFAULT_FACTOR</pre> |
| <div class="block">Default factor used if not otherwise specified, for all limits. (30).</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../constant-values.html#org.apache.mahout.cf.taste.impl.recommender.SamplingCandidateItemsStrategy.DEFAULT_FACTOR">Constant Field Values</a></dd> |
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| <h4>NO_LIMIT_FACTOR</h4> |
| <pre>public static final int NO_LIMIT_FACTOR</pre> |
| <div class="block">Specify this value as a factor to mean no limit.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../constant-values.html#org.apache.mahout.cf.taste.impl.recommender.SamplingCandidateItemsStrategy.NO_LIMIT_FACTOR">Constant Field Values</a></dd> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>SamplingCandidateItemsStrategy</h4> |
| <pre>public SamplingCandidateItemsStrategy(int numUsers, |
| int numItems)</pre> |
| <div class="block">Defaults to using no limit (<a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#NO_LIMIT_FACTOR"><code>NO_LIMIT_FACTOR</code></a>) for all factors, except |
| <code>candidatesPerUserFactor</code> which defaults to <a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#DEFAULT_FACTOR"><code>DEFAULT_FACTOR</code></a>.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/SamplingCandidateItemsStrategy.html#SamplingCandidateItemsStrategy-int-int-int-int-int-"><code>SamplingCandidateItemsStrategy(int, int, int, int, int)</code></a></dd> |
| </dl> |
| </li> |
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| <h4>SamplingCandidateItemsStrategy</h4> |
| <pre>public SamplingCandidateItemsStrategy(int itemsFactor, |
| int usersPerItemFactor, |
| int candidatesPerUserFactor, |
| int numUsers, |
| int numItems)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>itemsFactor</code> - factor controlling max items considered for a user</dd> |
| <dd><code>usersPerItemFactor</code> - factor controlling max users considered for each of those items</dd> |
| <dd><code>candidatesPerUserFactor</code> - factor controlling max candidate items considered from each of those users</dd> |
| <dd><code>numUsers</code> - number of users currently in the data</dd> |
| <dd><code>numItems</code> - number of items in the data</dd> |
| </dl> |
| </li> |
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| <a name="doGetCandidateItems-long:A-org.apache.mahout.cf.taste.model.DataModel-boolean-"> |
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| <h4>doGetCandidateItems</h4> |
| <pre>protected <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastIDSet.html" title="class in org.apache.mahout.cf.taste.impl.common">FastIDSet</a> doGetCandidateItems(long[] preferredItemIDs, |
| <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a> dataModel, |
| 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="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html#doGetCandidateItems-long:A-org.apache.mahout.cf.taste.model.DataModel-boolean-">doGetCandidateItems</a></code> in class <code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/recommender/AbstractCandidateItemsStrategy.html" title="class in org.apache.mahout.cf.taste.impl.recommender">AbstractCandidateItemsStrategy</a></code></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></dd> |
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