perClass Documentation
version 5.1 (31-May-2017)

kb14: How to train a two-stage algorithm?

Keywords: custom algorithms

Problem: How to train an algorithm that performs fature extraction followed by classifier training

Solution: Use the algorithm sda_featex.

Let us assume a problem where we want to build a two-stage algorithm performing a feature extraction step and then training a classifier in the resulting feature space. Very common example of two-stage algorithm is a PCA dimensionality reduction followed by a classifier.