svm-sigmoid-kernel-valid-only-some-params

IN premise — entries/2026/06/21/wiki-Support_vector_machine-chunk-2.md

Created 2026-06-21T09:55:54+00:00

The sigmoid kernel k(x,y) = tanh(kappa*x·y + c) is only a valid Mercer kernel for certain parameter values (kappa > 0, c < 0), not universally.