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[pyclustering.cluster.xmeans] MNDL incorrect formula #623

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annoviko opened this issue Aug 18, 2020 · 0 comments
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[pyclustering.cluster.xmeans] MNDL incorrect formula #623

annoviko opened this issue Aug 18, 2020 · 0 comments
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annoviko commented Aug 18, 2020 •
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Introduction
MNDL formula has a mistake in line with the paper Improving X-Means Clustering with MNDL - M.Shahbaba, S.Beheshti.

Incorrect part in the code:

scores = sigma_sqrt * (2 * K)**0.5 * ((2 * K)**0.5 + betta) / N + W - sigma_sqrt + Ks + 2 * alpha**0.5 * sigma_sqrt / N

Description
Scores should be calculated correctly.
@annoviko annoviko added the Bug Tasks related to found bugs label Aug 18, 2020
@annoviko annoviko self-assigned this Aug 18, 2020
annoviko added a commit that referenced this issue Aug 18, 2020
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#619, #623: Distance metric for X-Means. Correction for MNDL.
221b027
annoviko added a commit that referenced this issue Aug 20, 2020
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#623, #624: Correction for the formula of the MNDL splitting criteria…
cdb0ca9 
…. Introduced new parameters 'alpha' and 'beta' in order to control MNDL.
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