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| <h2 title="Class ClusteringUtils" class="title">Class ClusteringUtils</h2> |
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| <pre>public final class <span class="typeNameLabel">ClusteringUtils</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></pre> |
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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="t1" class="tableTab"><span><a href="javascript:show(1);">Static 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> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#choose2-double-">choose2</a></span>(double n)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#daviesBouldinIndex-java.util.List-org.apache.mahout.common.distance.DistanceMeasure-java.util.List-">daviesBouldinIndex</a></span>(<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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> centroids, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure, |
| <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="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/stats/OnlineSummarizer.html?is-external=true" title="class or interface in org.apache.mahout.math.stats">OnlineSummarizer</a>> clusterDistanceSummaries)</code> |
| <div class="block">Computes the Davies-Bouldin Index for a given clustering.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#dunnIndex-java.util.List-org.apache.mahout.common.distance.DistanceMeasure-java.util.List-">dunnIndex</a></span>(<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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> centroids, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure, |
| <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="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/stats/OnlineSummarizer.html?is-external=true" title="class or interface in org.apache.mahout.math.stats">OnlineSummarizer</a>> clusterDistanceSummaries)</code> |
| <div class="block">Computes the Dunn Index of a given clustering.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <T extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>><br>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#estimateDistanceCutoff-java.lang.Iterable-org.apache.mahout.common.distance.DistanceMeasure-int-">estimateDistanceCutoff</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><T> data, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure, |
| int sampleLimit)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#estimateDistanceCutoff-java.util.List-org.apache.mahout.common.distance.DistanceMeasure-">estimateDistanceCutoff</a></span>(<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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> data, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure)</code> |
| <div class="block">Estimates the distance cutoff.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#getAdjustedRandIndex-org.apache.mahout.math.Matrix-">getAdjustedRandIndex</a></span>(<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Matrix.html?is-external=true" title="class or interface in org.apache.mahout.math">Matrix</a> confusionMatrix)</code> |
| <div class="block">Computes the Adjusted Rand Index for a given confusion matrix.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Matrix.html?is-external=true" title="class or interface in org.apache.mahout.math">Matrix</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#getConfusionMatrix-java.util.List-java.util.List-java.lang.Iterable-org.apache.mahout.common.distance.DistanceMeasure-">getConfusionMatrix</a></span>(<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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> rowCentroids, |
| <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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> columnCentroids, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> datapoints, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure)</code> |
| <div class="block">Creates a confusion matrix by searching for the closest cluster of both the row clustering and column clustering |
| of a point and adding its weight to that cell of the matrix.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static <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="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/stats/OnlineSummarizer.html?is-external=true" title="class or interface in org.apache.mahout.math.stats">OnlineSummarizer</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#summarizeClusterDistances-java.lang.Iterable-java.lang.Iterable-org.apache.mahout.common.distance.DistanceMeasure-">summarizeClusterDistances</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> datapoints, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> centroids, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure)</code> |
| <div class="block">Computes the summaries for the distances in each cluster.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#totalClusterCost-java.lang.Iterable-java.lang.Iterable-">totalClusterCost</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> datapoints, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> centroids)</code> |
| <div class="block">Adds up the distances from each point to its closest cluster and returns the sum.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#totalClusterCost-java.lang.Iterable-org.apache.mahout.math.neighborhood.Searcher-">totalClusterCost</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> datapoints, |
| <a href="../../../../org/apache/mahout/math/neighborhood/Searcher.html" title="class in org.apache.mahout.math.neighborhood">Searcher</a> centroids)</code> |
| <div class="block">Adds up the distances from each point to its closest cluster and returns the sum.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html#totalWeight-java.lang.Iterable-">totalWeight</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> data)</code> |
| <div class="block">Computes the total weight of the points in the given Vector iterable.</div> |
| </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> |
| </ul> |
| </li> |
| </ul> |
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| <a name="summarizeClusterDistances-java.lang.Iterable-java.lang.Iterable-org.apache.mahout.common.distance.DistanceMeasure-"> |
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| </a> |
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| <h4>summarizeClusterDistances</h4> |
| <pre>public static <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="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/stats/OnlineSummarizer.html?is-external=true" title="class or interface in org.apache.mahout.math.stats">OnlineSummarizer</a>> summarizeClusterDistances(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> datapoints, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> centroids, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure)</pre> |
| <div class="block">Computes the summaries for the distances in each cluster.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>datapoints</code> - iterable of datapoints.</dd> |
| <dd><code>centroids</code> - iterable of Centroids.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a list of OnlineSummarizers where the i-th element is the summarizer corresponding to the cluster whose |
| index is i.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>totalClusterCost</h4> |
| <pre>public static double totalClusterCost(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> datapoints, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> centroids)</pre> |
| <div class="block">Adds up the distances from each point to its closest cluster and returns the sum.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>datapoints</code> - iterable of datapoints.</dd> |
| <dd><code>centroids</code> - iterable of Centroids.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the total cost described above.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="totalClusterCost-java.lang.Iterable-org.apache.mahout.math.neighborhood.Searcher-"> |
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| <h4>totalClusterCost</h4> |
| <pre>public static double totalClusterCost(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> datapoints, |
| <a href="../../../../org/apache/mahout/math/neighborhood/Searcher.html" title="class in org.apache.mahout.math.neighborhood">Searcher</a> centroids)</pre> |
| <div class="block">Adds up the distances from each point to its closest cluster and returns the sum.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>datapoints</code> - iterable of datapoints.</dd> |
| <dd><code>centroids</code> - searcher of Centroids.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the total cost described above.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="estimateDistanceCutoff-java.util.List-org.apache.mahout.common.distance.DistanceMeasure-"> |
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| <h4>estimateDistanceCutoff</h4> |
| <pre>public static double estimateDistanceCutoff(<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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> data, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure)</pre> |
| <div class="block">Estimates the distance cutoff. In StreamingKMeans, the distance between two vectors divided |
| by this value is used as a probability threshold when deciding whether to form a new cluster |
| or not. |
| Small values (comparable to the minimum distance between two points) are preferred as they |
| guarantee with high likelihood that all but very close points are put in separate clusters |
| initially. The clusters themselves are actually collapsed periodically when their number goes |
| over the maximum number of clusters and the distanceCutoff is increased. |
| So, the returned value is only an initial estimate.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - the datapoints whose distance is to be estimated.</dd> |
| <dd><code>distanceMeasure</code> - the distance measure used to compute the distance between two points.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the minimum distance between the first sampleLimit points</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#clusterInternal-java.lang.Iterable-boolean-"><code>StreamingKMeans.clusterInternal(Iterable, boolean)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="estimateDistanceCutoff-java.lang.Iterable-org.apache.mahout.common.distance.DistanceMeasure-int-"> |
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| <ul class="blockList"> |
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| <h4>estimateDistanceCutoff</h4> |
| <pre>public static <T extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> double estimateDistanceCutoff(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><T> data, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure, |
| int sampleLimit)</pre> |
| </li> |
| </ul> |
| <a name="daviesBouldinIndex-java.util.List-org.apache.mahout.common.distance.DistanceMeasure-java.util.List-"> |
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| <h4>daviesBouldinIndex</h4> |
| <pre>public static double daviesBouldinIndex(<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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> centroids, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure, |
| <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="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/stats/OnlineSummarizer.html?is-external=true" title="class or interface in org.apache.mahout.math.stats">OnlineSummarizer</a>> clusterDistanceSummaries)</pre> |
| <div class="block">Computes the Davies-Bouldin Index for a given clustering. |
| See http://en.wikipedia.org/wiki/Clustering_algorithm#Internal_evaluation</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>centroids</code> - list of centroids</dd> |
| <dd><code>distanceMeasure</code> - distance measure for inter-cluster distances</dd> |
| <dd><code>clusterDistanceSummaries</code> - summaries of the clusters; See summarizeClusterDistances</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the Davies-Bouldin Index</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="dunnIndex-java.util.List-org.apache.mahout.common.distance.DistanceMeasure-java.util.List-"> |
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| <h4>dunnIndex</h4> |
| <pre>public static double dunnIndex(<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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> centroids, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure, |
| <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="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/stats/OnlineSummarizer.html?is-external=true" title="class or interface in org.apache.mahout.math.stats">OnlineSummarizer</a>> clusterDistanceSummaries)</pre> |
| <div class="block">Computes the Dunn Index of a given clustering. See http://en.wikipedia.org/wiki/Dunn_index</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>centroids</code> - list of centroids</dd> |
| <dd><code>distanceMeasure</code> - distance measure to compute inter-centroid distance with</dd> |
| <dd><code>clusterDistanceSummaries</code> - summaries of the clusters; See summarizeClusterDistances</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the Dunn Index</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>choose2</h4> |
| <pre>public static double choose2(double n)</pre> |
| </li> |
| </ul> |
| <a name="getConfusionMatrix-java.util.List-java.util.List-java.lang.Iterable-org.apache.mahout.common.distance.DistanceMeasure-"> |
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| <h4>getConfusionMatrix</h4> |
| <pre>public static <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Matrix.html?is-external=true" title="class or interface in org.apache.mahout.math">Matrix</a> getConfusionMatrix(<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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> rowCentroids, |
| <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><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> columnCentroids, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> datapoints, |
| <a href="../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> distanceMeasure)</pre> |
| <div class="block">Creates a confusion matrix by searching for the closest cluster of both the row clustering and column clustering |
| of a point and adding its weight to that cell of the matrix. |
| It doesn't matter which clustering is the row clustering and which is the column clustering. If they're |
| interchanged, the resulting matrix is the transpose of the original one.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>rowCentroids</code> - clustering one</dd> |
| <dd><code>columnCentroids</code> - clustering two</dd> |
| <dd><code>datapoints</code> - datapoints whose closest cluster we need to find</dd> |
| <dd><code>distanceMeasure</code> - distance measure to use</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the confusion matrix</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getAdjustedRandIndex-org.apache.mahout.math.Matrix-"> |
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| <h4>getAdjustedRandIndex</h4> |
| <pre>public static double getAdjustedRandIndex(<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Matrix.html?is-external=true" title="class or interface in org.apache.mahout.math">Matrix</a> confusionMatrix)</pre> |
| <div class="block">Computes the Adjusted Rand Index for a given confusion matrix.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>confusionMatrix</code> - confusion matrix; not to be confused with the more restrictive ConfusionMatrix class</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the Adjusted Rand Index</dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>totalWeight</h4> |
| <pre>public static double totalWeight(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Vector.html?is-external=true" title="class or interface in org.apache.mahout.math">Vector</a>> data)</pre> |
| <div class="block">Computes the total weight of the points in the given Vector iterable.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - iterable of points</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>total weight</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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