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| <div class="subTitle">org.apache.mahout.clustering.streaming.cluster</div> |
| <h2 title="Class StreamingKMeans" class="title">Class StreamingKMeans</h2> |
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| <li>org.apache.mahout.clustering.streaming.cluster.StreamingKMeans</li> |
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| <pre>public class <span class="typeNameLabel">StreamingKMeans</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://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Centroid.html?is-external=true" title="class or interface in org.apache.mahout.math">Centroid</a>></pre> |
| <div class="block">Implements a streaming k-means algorithm for weighted vectors. |
| The goal clustering points one at a time, especially useful for MapReduce mappers that get inputs one at a time. |
| |
| A rough description of the algorithm: |
| Suppose there are l clusters at one point and a new point p is added. |
| The new point can either be added to one of the existing l clusters or become a new cluster. To decide: |
| - let c be the closest cluster to point p; |
| - let d be the distance between c and p; |
| - if d > distanceCutoff, create a new cluster from p (p is too far away from the clusters to be part of them; |
| distanceCutoff represents the largest distance from a point its assigned cluster's centroid); |
| - else (d <= distanceCutoff), create a new cluster with probability d / distanceCutoff (the probability of creating |
| a new cluster increases as d increases). |
| There will be either l points or l + 1 points after processing a new point. |
| |
| As the number of clusters increases, it will go over the numClusters limit (numClusters represents a recommendation |
| for the number of clusters that there should be at the end). To decrease the number of clusters the existing clusters |
| are treated as data points and are re-clustered (collapsed). This tends to make the number of clusters go down. |
| If the number of clusters is still too high, distanceCutoff is increased. |
| |
| For more details, see: |
| - "Streaming k-means approximation" by N. Ailon, R. Jaiswal, C. Monteleoni |
| http://books.nips.cc/papers/files/nips22/NIPS2009_1085.pdf |
| - "Fast and Accurate k-means for Large Datasets" by M. Shindler, A. Wong, A. Meyerson, |
| http://books.nips.cc/papers/files/nips24/NIPS2011_1271.pdf</div> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#StreamingKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-">StreamingKMeans</a></span>(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> searcher, |
| int numClusters)</code> |
| <div class="block">Calls StreamingKMeans(searcher, numClusters, 1.3, 10, 2).</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#StreamingKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-double-">StreamingKMeans</a></span>(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> searcher, |
| int numClusters, |
| double distanceCutoff)</code> |
| <div class="block">Calls StreamingKMeans(searcher, numClusters, distanceCutoff, 1.3, 10, 2).</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#StreamingKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-double-double-double-double-">StreamingKMeans</a></span>(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> searcher, |
| int numClusters, |
| double distanceCutoff, |
| double beta, |
| double clusterLogFactor, |
| double clusterOvershoot)</code> |
| <div class="block">Creates a new StreamingKMeans class given a searcher and the number of clusters to generate.</div> |
| </td> |
| </tr> |
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| <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><a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#cluster-org.apache.mahout.math.Centroid-">cluster</a></span>(<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Centroid.html?is-external=true" title="class or interface in org.apache.mahout.math">Centroid</a> datapoint)</code> |
| <div class="block">Cluster one data point.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#cluster-java.lang.Iterable-">cluster</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><<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Centroid.html?is-external=true" title="class or interface in org.apache.mahout.math">Centroid</a>> datapoints)</code> |
| <div class="block">Cluster the data points in an Iterable<Centroid>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#cluster-org.apache.mahout.math.Matrix-">cluster</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> data)</code> |
| <div class="block">Cluster the rows of a matrix, treating them as Centroids with weight 1.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#getDistanceCutoff--">getDistanceCutoff</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#getDistanceMeasure--">getDistanceMeasure</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/clustering/streaming/cluster/StreamingKMeans.html#getNumClusters--">getNumClusters</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Centroid.html?is-external=true" title="class or interface in org.apache.mahout.math">Centroid</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#iterator--">iterator</a></span>()</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#reindexCentroids--">reindexCentroids</a></span>()</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#setDistanceCutoff-double-">setDistanceCutoff</a></span>(double distanceCutoff)</code> </td> |
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| <h3>Methods inherited from interface java.lang.<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></h3> |
| <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true#forEach-java.util.function.Consumer-" title="class or interface in java.lang">forEach</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true#spliterator--" title="class or interface in java.lang">spliterator</a></code></li> |
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| <h3>Constructor Detail</h3> |
| <a name="StreamingKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>StreamingKMeans</h4> |
| <pre>public StreamingKMeans(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> searcher, |
| int numClusters)</pre> |
| <div class="block">Calls StreamingKMeans(searcher, numClusters, 1.3, 10, 2).</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#StreamingKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-double-double-double-double-"><code>StreamingKMeans(org.apache.mahout.math.neighborhood.UpdatableSearcher, int, |
| double, double, double, double)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="StreamingKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-double-"> |
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| <h4>StreamingKMeans</h4> |
| <pre>public StreamingKMeans(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> searcher, |
| int numClusters, |
| double distanceCutoff)</pre> |
| <div class="block">Calls StreamingKMeans(searcher, numClusters, distanceCutoff, 1.3, 10, 2).</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/StreamingKMeans.html#StreamingKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-double-double-double-double-"><code>StreamingKMeans(org.apache.mahout.math.neighborhood.UpdatableSearcher, int, |
| double, double, double, double)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="StreamingKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-double-double-double-double-"> |
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| <h4>StreamingKMeans</h4> |
| <pre>public StreamingKMeans(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> searcher, |
| int numClusters, |
| double distanceCutoff, |
| double beta, |
| double clusterLogFactor, |
| double clusterOvershoot)</pre> |
| <div class="block">Creates a new StreamingKMeans class given a searcher and the number of clusters to generate.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>searcher</code> - A Searcher that is used for performing nearest neighbor search. It MUST BE |
| EMPTY initially because it will be used to keep track of the cluster |
| centroids.</dd> |
| <dd><code>numClusters</code> - An estimated number of clusters to generate for the data points. |
| This can adjusted, but the actual number will depend on the data. The</dd> |
| <dd><code>distanceCutoff</code> - The initial distance cutoff representing the value of the |
| distance between a point and its closest centroid after which |
| the new point will definitely be assigned to a new cluster.</dd> |
| <dd><code>beta</code> - Ratio of geometric progression to use when increasing distanceCutoff. After n increases, distanceCutoff |
| becomes distanceCutoff * beta^n. A smaller value increases the distanceCutoff less aggressively.</dd> |
| <dd><code>clusterLogFactor</code> - Value multiplied with the number of points counted so far estimating the number of clusters |
| to aim for. If the final number of clusters is known and this clustering is only for a |
| sketch of the data, this can be the final number of clusters, k.</dd> |
| <dd><code>clusterOvershoot</code> - Multiplicative slack factor for slowing down the collapse of the clusters.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <h4>iterator</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Centroid.html?is-external=true" title="class or interface in org.apache.mahout.math">Centroid</a>> iterator()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true#iterator--" title="class or interface in java.lang">iterator</a></code> in interface <code><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><<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Centroid.html?is-external=true" title="class or interface in org.apache.mahout.math">Centroid</a>></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an Iterator to the Centroids contained in this clusterer.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="cluster-org.apache.mahout.math.Matrix-"> |
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| </a> |
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| <h4>cluster</h4> |
| <pre>public <a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> cluster(<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> data)</pre> |
| <div class="block">Cluster the rows of a matrix, treating them as Centroids with weight 1.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - matrix whose rows are to be clustered.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the UpdatableSearcher containing the resulting centroids.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="cluster-java.lang.Iterable-"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>cluster</h4> |
| <pre>public <a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> cluster(<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><<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Centroid.html?is-external=true" title="class or interface in org.apache.mahout.math">Centroid</a>> datapoints)</pre> |
| <div class="block">Cluster the data points in an Iterable<Centroid>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>datapoints</code> - Iterable whose elements are to be clustered.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the UpdatableSearcher containing the resulting centroids.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="cluster-org.apache.mahout.math.Centroid-"> |
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| </a> |
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| <h4>cluster</h4> |
| <pre>public <a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a> cluster(<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/Centroid.html?is-external=true" title="class or interface in org.apache.mahout.math">Centroid</a> datapoint)</pre> |
| <div class="block">Cluster one data point.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>datapoint</code> - to be clustered.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the UpdatableSearcher containing the resulting centroids.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getNumClusters--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getNumClusters</h4> |
| <pre>public int getNumClusters()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of clusters computed from the points until now.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="reindexCentroids--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>reindexCentroids</h4> |
| <pre>public void reindexCentroids()</pre> |
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| <ul class="blockList"> |
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| <h4>getDistanceCutoff</h4> |
| <pre>public double getDistanceCutoff()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the distanceCutoff (an upper bound for the maximum distance within a cluster).</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setDistanceCutoff-double-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setDistanceCutoff</h4> |
| <pre>public void setDistanceCutoff(double distanceCutoff)</pre> |
| </li> |
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| <a name="getDistanceMeasure--"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getDistanceMeasure</h4> |
| <pre>public <a href="../../../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a> getDistanceMeasure()</pre> |
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