Magnus Ekdahl.'s Approximations of Bayes classifiers for statistical learning PDF

By Magnus Ekdahl.

ISBN-10: 9185497215

ISBN-13: 9789185497218

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With visited cells marked gray and the light edge as bold in the cache. 31 95 61 84 95 61 84 95 61 0 50 0 50 186 50 38 38 38 cache: 31 95 61 cache: 31 0 50 cache: 31 0 38 In the first step all edges to and from vertex 0 is checked. Those with the smallest weight to each remaining vertex are stored in the cache and the smallest (31) is added to F. In step 2 and 3 the cache is updated with new lower weights from and to vertex {1, 2}. The smallest in the remaining cache is added to F. 1 Running time FindMin needs to check all outgoing and in-going edges to vertex 0, taking O(2(d − 1)) = O(d) time.

Runs in time polynomial in n. 1 [5] Given independent observations of (ξ, cB (ξ)), where cB (ξ) needs n2 bits to be represented, an Occam-algorithm with parameters c 1 and 0 α < 1 produces a cˆ ξ|x(n) such that P P cˆ ξ|x(n) = cB (ξ) 1−δ ε (25) using sample size O 1 δ ln ε + nc2 ε 1 1−α February 13, 2006 (13:19) . (26) 31 Thus for fixed α, c and n a reduction in the bits needed to represent cˆ ξ|x(n) from l1 = nc2 (l1 )nα to l2 = nc2 (l2 )nα bits implies that nc2 (l1 ) > nc2 (l2 ), essentially we are reducing the bound on nc2 , thus through equation (26) that the performance in the sense of equation (25) can be increased (ε or δ can be reduced).

Now we continue with how to actually reduce SC for the whole classification. No optimal algorithm for unsupervised classification is known to us, thus we will try a greedy algorithm. In other words we will calculate the difference in SC when moving a vector from one class to another and stop when no movement gives us a reduction in SC. This will in general only give us a local optimum, but it will be reasonably efficient to implement. Since the algorithm will only evaluate the difference when moving an element from one class to another we will have to evaluate an expression for the effect of inserting the element into a class.

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Approximations of Bayes classifiers for statistical learning of clusters by Magnus Ekdahl.


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