Using the Callback Functions

The user's main avenues for customization of SYMPHONY are the tuning of parameters and the implementation of one or more of over 50 user callback functions. The callback functions allow the user to override SYMPHONY's default behavior for many of the functions performed as part of its algorithm. The user has complete control over branching, cutting plane generation, management of the cut pool and the LP relaxation, search and diving strategies, etc. More detailed information about using the callback functions to develop custom applications is provided in Chapter 5.

Ted Ralphs