64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/*
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----
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This file is NOT part of SECONDO.
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* Authors: Greg Hamerly and Jonathan Drake
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* Feedback: hamerly@cs.baylor.edu
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* See: http://cs.baylor.edu/~hamerly/software/kmeans.php
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* Copyright 2014
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*
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* A kernelized version of Elkan's algorithm. It would be nice to make this
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* inherit from both KernelKmeans and ElkanKmeans, but for now we basically
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* replicate code.
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----
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//paragraph [1] Title: [{\Large \bf \begin{center}] [\end{center}}]
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//[TOC] [\tableofcontents]
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[1] Declarations for the Eklan's' kmeans algorithm
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1 Declarations for the Elkan's kmeans algorithm
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*/
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#ifndef ELKAN_KMEANS_H
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#define ELKAN_KMEANS_H
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/* Authors: Greg Hamerly and Jonathan Drake
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* Feedback: hamerly@cs.baylor.edu
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* See: http://cs.baylor.edu/~hamerly/software/kmeans.php
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* Copyright 2014
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*
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* Elkan's k-means algorithm that uses k lower bounds per point to prune
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* distance calculations.
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*/
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#include "triangle_inequality_base_kmeans.h"
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class ElkanKmeans : public TriangleInequalityBaseKmeans {
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public:
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ElkanKmeans() : centerCenterDistDiv2(NULL) {}
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virtual ~ElkanKmeans() { free(); }
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virtual void free();
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virtual void initialize(Dataset const *aX, unsigned short aK,
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unsigned short *initialAssignment, int aNumThreads);
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virtual std::string getName() const { return "elkan"; }
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protected:
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virtual int runThread(int threadId, int maxIterations);
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// Update the distances between each pair of centers.
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void update_center_dists(int threadId);
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// Update the upper and lower bounds for the range of points given.
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void update_bounds(int startNdx, int endNdx);
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// Keep track of the distance (divided by 2) between each pair of
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// points.
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double *centerCenterDistDiv2;
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};
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#endif
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