NETWORK OPTIMIZATION CODES: Misc network optimization codes. for shortest path, max-flow, assignment, and linear single commodity network flow optimization RELAX4 code and RELAX4 documentation for linear single commodity network optimization. C++ Implementation of RELAX4 code from the University of Pisa AUCTION and other algorithms for assignment problems. Muliticommodity Flow algorithm based on gradient projection method and a path flow formulation. Epsilon-Relaxation method (also known as the preflow push method) for solving linear and separable quadratic minimum cost network flow problems.