However, coding multi-class logistic regression from scratch has least four advantages over using a library. Your code can be small and efficient, you can avoid licensing and copyright issues, you ...

The CATMOD procedure can perform linear regression and logistic regression of response functions for data that can be represented in a contingency table. See Chapter 5, "Introduction to Categorical ...

James McCaffrey of Microsoft Research uses a full code program, examples and graphics to explain multi-class logistic regression ... means that it's possible to separate the data using hyperplanes.