Initializing help system before first use

problem.setcbslpnode

Purpose
Set a user callback to be called during MISLP after the SLP optimization at each node.
Synopsis

problem.setcbslpnode(callback, data)

(retval, infeas) = callback(my_prob, my_object)
Arguments
callback 
The function to be called after the set-up of the SLP problem to be solved at a node. callback returns an integer value. If the return value is nonzero, or if the feasibility flag is set nonzero, then further processing of the node will be terminated (it is declared infeasible).
my_prob 
The problem passed to the callback function.
my_object 
The user-defined object passed as data to setcbslpnode.
infeas 
An integer containing the feasibility flag. If callback sets the flag nonzero, the node is declared infeasible.
data 
A user-defined object, which can be used for any purpose by the function. data is passed to callback as my_object.
Example
The following example sets up a callback function to be executed at each node after the SLP optimization finishes. If the solution value is worse than a target value (referenced through the user object), the node is cut off (it is declared infeasible). 
objtarget = []
p.setcbslpnode(CBSLPNode, objtarget)
A suitable callback function might resemble the following: 
def CBSLPNode(my_prob, my_obj):
  lpval = my_prob.attributes.lpobjval
  return (0, (lpval < my_obj))
Further information

If a node can be cut off by the callback function, then further exploration of the node is avoided.



Parent Topic Xpress problem methods

© 2001-2025 Fair Isaac Corporation. All rights reserved. This documentation is the property of Fair Isaac Corporation (“FICO”). Receipt or possession of this documentation does not convey rights to disclose, reproduce, make derivative works, use, or allow others to use it except solely for internal evaluation purposes to determine whether to purchase a license to the software described in this documentation, or as otherwise set forth in a written software license agreement between you and FICO (or a FICO affiliate). Use of this documentation and the software described in it must conform strictly to the foregoing permitted uses, and no other use is permitted.