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| <h1 title="Package" class="title">Package org.apache.mahout.clustering</h1> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/Cluster.html" title="interface in org.apache.mahout.clustering">Cluster</a></td> |
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| <div class="block">Implementations of this interface have a printable representation and certain |
| attributes that are common across all clustering implementations</div> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/GaussianAccumulator.html" title="interface in org.apache.mahout.clustering">GaussianAccumulator</a></td> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/Model.html" title="interface in org.apache.mahout.clustering">Model</a><O></td> |
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| <div class="block">A model is a probability distribution over observed data points and allows |
| the probability of any data point to be computed.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/ModelDistribution.html" title="interface in org.apache.mahout.clustering">ModelDistribution</a><O></td> |
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| <div class="block">A model distribution allows us to sample a model from its prior distribution.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/AbstractCluster.html" title="class in org.apache.mahout.clustering">AbstractCluster</a></td> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/ClusteringUtils.html" title="class in org.apache.mahout.clustering">ClusteringUtils</a></td> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/OnlineGaussianAccumulator.html" title="class in org.apache.mahout.clustering">OnlineGaussianAccumulator</a></td> |
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| <div class="block">An online Gaussian statistics accumulator based upon Knuth (who cites Welford) which is declared to be |
| numerically-stable.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/RunningSumsGaussianAccumulator.html" title="class in org.apache.mahout.clustering">RunningSumsGaussianAccumulator</a></td> |
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| <div class="block">An online Gaussian accumulator that uses a running power sums approach as reported |
| on http://en.wikipedia.org/wiki/Standard_deviation |
| Suffers from overflow, underflow and roundoff error but has minimal observe-time overhead</div> |
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| <td class="colFirst"><a href="../../../../org/apache/mahout/clustering/UncommonDistributions.html" title="class in org.apache.mahout.clustering">UncommonDistributions</a></td> |
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| <h2 title="Package org.apache.mahout.clustering Description">Package org.apache.mahout.clustering Description</h2> |
| <div class="block"><p></p>This package provides several clustering algorithm implementations. Clustering usually groups a set of |
| objects into groups of similar items. The definition of similarity usually is up to you - for text documents, |
| cosine-distance/-similarity is recommended. Mahout also features other types of distance measure like |
| Euclidean distance.</p> |
| |
| <p></p>Input of each clustering algorithm is a set of vectors representing your items. For texts in general these are |
| <a href="http://en.wikipedia.org/wiki/TFIDF">TFIDF</a> or |
| <a href="http://en.wikipedia.org/wiki/Bag_of_words">Bag of words</a> representations of the documents.</p> |
| |
| <p>Output of each clustering algorithm is either a hard or soft assignment of items to clusters.</p></div> |
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