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java.lang.Objectorg.apache.mahout.cf.taste.impl.recommender.knn.ConjugateGradientOptimizer
public final class ConjugateGradientOptimizer
Constructor Summary | |
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ConjugateGradientOptimizer()
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Method Summary | |
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double[] |
optimize(double[][] matrix,
double[] b)
Conjugate gradient optimization. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ConjugateGradientOptimizer()
Method Detail |
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public double[] optimize(double[][] matrix, double[] b)
Conjugate gradient optimization. Matlab code:
function [x] = conjgrad(A,b,x0) x = x0; r = b - A*x0; w = -r; for i = 1:size(A); z = A*w; a = (r'*w)/(w'*z); x = x + a*w; r = r - a*z; if( norm(r) < 1e-10 ) break; end B = (r'*z)/(w'*z); w = -r + B*w; end end
optimize
in interface Optimizer
matrix
- matrix nxn positionsb
- vector b, n positions
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