Amnon Balanov

A Geometric Analysis of Initialization Bias in Spherical $K$-means in the Weak Signal Regime

We study initialization bias in spherical $K$-means for weakly informative directional mixtures. We model the observations by a $K$-component von Mises-Fisher mixture with a small concentration parameter $\kappa$, corresponding to a high-dispersion regime in which the data provide limited information about the underlyi...