metricChoices is a function returning the names of all
(semi-)metrics that are currently implemented in the
link{classiFunc}-package and can be used for the argument
method in computeDistMat or the argument
metric in classiKnn and classiKernel
respectively.
metricChoices(proxy.only = FALSE)[logical(1)]
should only the metrics of the proxy package be returned? Defaults to
FALSE, which results in returning the names of all allowed metrics
for computeDistMat.