PPCI

Implements recently developed projection pursuit algorithms for finding optimal linear cluster separators. The clustering algorithms use optimal hyperplane separators based on minimum density, Pavlidis et. al (2016) ; minimum normalised cut, Hofmeyr (2017) doi:10.1109/TPAMI.2016.2609929; and maximum variance ratio clusterability, Hofmeyr and Pavlidis (2015) doi:10.1109/SSCI.2015.116.