Forum Discussion
Implementation of B&B with python
HI! I'm trying to implement a branc-and-bound solver by using the python interface of Xpress. I implemented a MINLP model, and I am trying to solve the linearization with the B&B algorithm. Even t...
Hi Nicolò,
Is there any reason you aren't using the MINLP solver in Xpress? We offer both a local and a global MINLP solver. What is your specific application?
In any case, here are a few answers (my colleagues will answer the rest)?
The cutoff is updated in several ways, based on incumbents, but also the GCD in the objective coefficients, the relative gap required, etc. We don't provide a message or information about it.
We aren't providing information on the active nodes or the solution logs for all the nodes (whether in serial or parallel mode).
The branching attributes are to be queried after the branching decision has been taken. If I understand you correctly you are trying to make the decision yourself. Note that these are attributes and not controls.
