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<h2 title="Class CosineDistanceMeasure" class="title">Class CosineDistanceMeasure</h2>
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<pre>public class <span class="typeNameLabel">CosineDistanceMeasure</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="../../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a></pre>
<div class="block">This class implements a cosine distance metric by dividing the dot product of two vectors by the product of their
lengths. That gives the cosine of the angle between the two vectors. To convert this to a usable distance,
1-cos(angle) is what is actually returned.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/common/distance/CosineDistanceMeasure.html#CosineDistanceMeasure--">CosineDistanceMeasure</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/common/distance/CosineDistanceMeasure.html#configure-org.apache.hadoop.conf.Configuration-">configure</a></span>(org.apache.hadoop.conf.Configuration&nbsp;job)</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/common/distance/CosineDistanceMeasure.html#createParameters-java.lang.String-org.apache.hadoop.conf.Configuration-">createParameters</a></span>(<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>&nbsp;prefix,
org.apache.hadoop.conf.Configuration&nbsp;jobConf)</code>
<div class="block">EXPERT: consumers should never have to call this method.</div>
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<td class="colFirst"><code>static double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/common/distance/CosineDistanceMeasure.html#distance-double:A-double:A-">distance</a></span>(double[]&nbsp;p1,
double[]&nbsp;p2)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/common/distance/CosineDistanceMeasure.html#distance-double-org.apache.mahout.math.Vector-org.apache.mahout.math.Vector-">distance</a></span>(double&nbsp;centroidLengthSquare,
<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>&nbsp;centroid,
<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>&nbsp;v)</code>
<div class="block">Optimized version of distance metric for sparse vectors.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/common/distance/CosineDistanceMeasure.html#distance-org.apache.mahout.math.Vector-org.apache.mahout.math.Vector-">distance</a></span>(<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>&nbsp;v1,
<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>&nbsp;v2)</code>
<div class="block">Returns the distance metric applied to the arguments</div>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mahout/common/distance/CosineDistanceMeasure.html#getParameters--">getParameters</a></span>()</code>&nbsp;</td>
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<pre>public&nbsp;CosineDistanceMeasure()</pre>
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<pre>public&nbsp;<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>&lt;<a href="../../../../../org/apache/mahout/common/parameters/Parameter.html" title="interface in org.apache.mahout.common.parameters">Parameter</a>&lt;?&gt;&gt;&nbsp;getParameters()</pre>
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<pre>public&nbsp;void&nbsp;createParameters(<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>&nbsp;prefix,
org.apache.hadoop.conf.Configuration&nbsp;jobConf)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/mahout/common/parameters/Parametered.html#createParameters-java.lang.String-org.apache.hadoop.conf.Configuration-">Parametered</a></code></span></div>
<div class="block">EXPERT: consumers should never have to call this method. It would be friendly visible to
<a href="../../../../../org/apache/mahout/common/parameters/Parametered.ParameteredGeneralizations.html" title="class in org.apache.mahout.common.parameters"><code>Parametered.ParameteredGeneralizations</code></a> if java supported it. Calling this method should create a new list of
parameters and is called</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/mahout/common/parameters/Parametered.html#createParameters-java.lang.String-org.apache.hadoop.conf.Configuration-">createParameters</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/mahout/common/parameters/Parametered.html" title="interface in org.apache.mahout.common.parameters">Parametered</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>prefix</code> - ends with a dot if not empty.</dd>
<dd><code>jobConf</code> - configuration used for retrieving values</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/mahout/common/parameters/Parametered.ParameteredGeneralizations.html#configureParameters-java.lang.String-org.apache.mahout.common.parameters.Parametered-org.apache.hadoop.conf.Configuration-"><code>invoking method</code></a>,
<a href="../../../../../org/apache/mahout/common/parameters/Parametered.ParameteredGeneralizations.html#configureParametersRecursively-org.apache.mahout.common.parameters.Parametered-java.lang.String-org.apache.hadoop.conf.Configuration-"><code>invoking method</code></a></dd>
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<h4>distance</h4>
<pre>public static&nbsp;double&nbsp;distance(double[]&nbsp;p1,
double[]&nbsp;p2)</pre>
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<h4>distance</h4>
<pre>public&nbsp;double&nbsp;distance(<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>&nbsp;v1,
<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>&nbsp;v2)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/mahout/common/distance/DistanceMeasure.html#distance-org.apache.mahout.math.Vector-org.apache.mahout.math.Vector-">DistanceMeasure</a></code></span></div>
<div class="block">Returns the distance metric applied to the arguments</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/mahout/common/distance/DistanceMeasure.html#distance-org.apache.mahout.math.Vector-org.apache.mahout.math.Vector-">distance</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>v1</code> - a Vector defining a multidimensional point in some feature space</dd>
<dd><code>v2</code> - a Vector defining a multidimensional point in some feature space</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a scalar doubles of the distance</dd>
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<h4>distance</h4>
<pre>public&nbsp;double&nbsp;distance(double&nbsp;centroidLengthSquare,
<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>&nbsp;centroid,
<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>&nbsp;v)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/mahout/common/distance/DistanceMeasure.html#distance-double-org.apache.mahout.math.Vector-org.apache.mahout.math.Vector-">DistanceMeasure</a></code></span></div>
<div class="block">Optimized version of distance metric for sparse vectors. This distance computation requires operations
proportional to the number of non-zero elements in the vector instead of the cardinality of the vector.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/mahout/common/distance/DistanceMeasure.html#distance-double-org.apache.mahout.math.Vector-org.apache.mahout.math.Vector-">distance</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/mahout/common/distance/DistanceMeasure.html" title="interface in org.apache.mahout.common.distance">DistanceMeasure</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>centroidLengthSquare</code> - Square of the length of centroid</dd>
<dd><code>centroid</code> - Centroid vector</dd>
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