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<div class="subTitle">org.apache.mahout.clustering.streaming.cluster</div>
<h2 title="Class BallKMeans" class="title">Class BallKMeans</h2>
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<pre>public class <span class="typeNameLabel">BallKMeans</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>&lt;<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>&gt;</pre>
<div class="block">Implements a ball k-means algorithm for weighted vectors with probabilistic seeding similar to k-means++.
The idea is that k-means++ gives good starting clusters and ball k-means can tune up the final result very nicely
in only a few passes (or even in a single iteration for well-clusterable data).
A good reference for this class of algorithms is "The Effectiveness of Lloyd-Type Methods for the k-Means Problem"
by Rafail Ostrovsky, Yuval Rabani, Leonard J. Schulman and Chaitanya Swamy. The code here uses the seeding strategy
as described in section 4.1.1 of that paper and the ball k-means step as described in section 4.2. We support
multiple iterations in contrast to the algorithm described in the paper.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/BallKMeans.html#BallKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-int-">BallKMeans</a></span>(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a>&nbsp;searcher,
int&nbsp;numClusters,
int&nbsp;maxNumIterations)</code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/BallKMeans.html#BallKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-int-boolean-int-">BallKMeans</a></span>(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a>&nbsp;searcher,
int&nbsp;numClusters,
int&nbsp;maxNumIterations,
boolean&nbsp;kMeansPlusPlusInit,
int&nbsp;numRuns)</code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/BallKMeans.html#BallKMeans-org.apache.mahout.math.neighborhood.UpdatableSearcher-int-int-double-boolean-boolean-double-int-">BallKMeans</a></span>(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a>&nbsp;searcher,
int&nbsp;numClusters,
int&nbsp;maxNumIterations,
double&nbsp;trimFraction,
boolean&nbsp;kMeansPlusPlusInit,
boolean&nbsp;correctWeights,
double&nbsp;testProbability,
int&nbsp;numRuns)</code>&nbsp;</td>
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<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/BallKMeans.html#cluster-java.util.List-">cluster</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>&lt;? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/WeightedVector.html?is-external=true" title="class or interface in org.apache.mahout.math">WeightedVector</a>&gt;&nbsp;datapoints)</code>
<div class="block">Clusters the datapoints in the list doing either random seeding of the centroids or k-means++.</div>
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<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>&lt;<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>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/BallKMeans.html#iterator--">iterator</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../../../../org/apache/mahout/common/Pair.html" title="class in org.apache.mahout.common">Pair</a>&lt;<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>&lt;? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/WeightedVector.html?is-external=true" title="class or interface in org.apache.mahout.math">WeightedVector</a>&gt;,<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>&lt;? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/WeightedVector.html?is-external=true" title="class or interface in org.apache.mahout.math">WeightedVector</a>&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/clustering/streaming/cluster/BallKMeans.html#splitTrainTest-java.util.List-">splitTrainTest</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>&lt;? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/WeightedVector.html?is-external=true" title="class or interface in org.apache.mahout.math">WeightedVector</a>&gt;&nbsp;datapoints)</code>&nbsp;</td>
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<h4>BallKMeans</h4>
<pre>public&nbsp;BallKMeans(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a>&nbsp;searcher,
int&nbsp;numClusters,
int&nbsp;maxNumIterations)</pre>
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<h4>BallKMeans</h4>
<pre>public&nbsp;BallKMeans(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a>&nbsp;searcher,
int&nbsp;numClusters,
int&nbsp;maxNumIterations,
boolean&nbsp;kMeansPlusPlusInit,
int&nbsp;numRuns)</pre>
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<h4>BallKMeans</h4>
<pre>public&nbsp;BallKMeans(<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a>&nbsp;searcher,
int&nbsp;numClusters,
int&nbsp;maxNumIterations,
double&nbsp;trimFraction,
boolean&nbsp;kMeansPlusPlusInit,
boolean&nbsp;correctWeights,
double&nbsp;testProbability,
int&nbsp;numRuns)</pre>
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<h4>splitTrainTest</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/mahout/common/Pair.html" title="class in org.apache.mahout.common">Pair</a>&lt;<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>&lt;? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/WeightedVector.html?is-external=true" title="class or interface in org.apache.mahout.math">WeightedVector</a>&gt;,<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>&lt;? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/WeightedVector.html?is-external=true" title="class or interface in org.apache.mahout.math">WeightedVector</a>&gt;&gt;&nbsp;splitTrainTest(<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>&lt;? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/WeightedVector.html?is-external=true" title="class or interface in org.apache.mahout.math">WeightedVector</a>&gt;&nbsp;datapoints)</pre>
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<h4>cluster</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/mahout/math/neighborhood/UpdatableSearcher.html" title="class in org.apache.mahout.math.neighborhood">UpdatableSearcher</a>&nbsp;cluster(<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>&lt;? extends <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/WeightedVector.html?is-external=true" title="class or interface in org.apache.mahout.math">WeightedVector</a>&gt;&nbsp;datapoints)</pre>
<div class="block">Clusters the datapoints in the list doing either random seeding of the centroids or k-means++.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>datapoints</code> - the points to be clustered.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an UpdatableSearcher with the resulting clusters.</dd>
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<h4>iterator</h4>
<pre>public&nbsp;<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>&lt;<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>&gt;&nbsp;iterator()</pre>
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