Xpress Update 8.4.7

Document created by Michael.Perr on Apr 6, 2018
Version 1Show Document
  • View in full screen mode

Xpress Update 8.4.7 is now available on Box.com for Windows, Linux and Mac, from

 

               https://fico.box.com/v/xpress-8-4-7

 

This is the latest update for the Xpress 8.4 release branch. Please note that it must be installed over a prior installation of FICO Xpress 8.4 and requires a valid Xpress 8.4 license.

 

Release Notes:

 

Xpress Optimizer 32.01.10:

 

  • Fixed an issue that could result in an infeasible solution from the barrier algorithm.
  • Fixed an issue that might trigger a failure in the Dot product of the Python interface when handling nonlinear expressions.
  • The Sum and Prod methods of the Python interface now accept None as its neutral element.
  • Fixed a potential deadlock when Mosel callbacks are used to add cuts in parallel MIP solves
  • Fixed some issues in the Python interface in the way it handles controls and attributes, parameters to callbacks, and various API functions.
  • Fixed issue with xpress.problem.storecuts() in the Python interface.
  • Fixed some issues in the dot product implementation of the Python interface that may affect its result.
  • Fixed a performance issue with long reoptimization loops in diving heuristics.
  • Fixed issue when calling XPRSgetdualray and a factorization is not present.
  • Relaxed some tolerances around user solutions, to prevent minor numerical issues from causing solutions to be rejected.
  • Setting PREBASISRED=1 will now ignore density checks when deciding whether to apply basis reduction.

 

Xpress Nonlinear 32.01.10:

 

  • * XSLP_STATUS will now have XSLP_STATUS_INTEGERINFEASIBLE set if the SLP-MIP-SLP method is infeasible in the MIP search.
  • * XSLP_STATUS will now have XSLP_STATUS_ENFORCED set if XSLP_MAXERRORCOST is hit and all error variables are removed.
  • * XSLP_BARSTARTOPS is now independent of XSLP_BARCROSSOVERSTART.
1 person found this helpful

Attachments

    Outcomes