Overfitting Problem in the Approximate Bayesian Computation Method Based on Maxima Weighted Isolation Kernel

Abstract

Recently we designed the heuristic approximate Bayesian computation method based on maxima weighted isolation kernel. The method showed good results on parameter estimation for the branching processes model that has unevenly stochastically distributed data. This work is devoted to the problem of the fitting and overfitting of the internal parameters for the method such as a number of Voronoi sites and a number of trees of isolation forest. Here, we discuss the reasons for overfitting and how to fit parameters properly with an example of a two-dimension task.