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problem.addNodecutoffCallback

Purpose
Declares a user node cutoff callback function, called every time a node is cut off as a result of an improved integer solution being found during the branch and bound search. This callback function will be called in addition to any callbacks already added by problem.addNodecutoffCallback.
Topic areas
Callback, Branch and Bound Search
Synopsis
problem.addNodecutoffCallback(nodecutoff, data=None, priority=0)
nodecutoff(cbprob, cbdata, node)
Arguments
nodecutoff 
The callback function, which takes arguments cbprob, cbdata and node, and has no return value. This function is called every time a node is cut off as the result of an improved integer solution being found.
data 
A user-defined data to be passed to the callback function, nodecutoff.
priority 
An integer that determines the order in which multiple node-optimal callbacks will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.
cbprob 
The problem passed to the callback function, nodecutoff.
cbdata 
The user-defined data passed as data when setting up the callback.
node 
The node id of the node that is cut off. This id cannot be queried from the CURRENTNODE attribute as for other callbacks since this callback is not invoked in the context of the node being cutoff.
Further information
1. This function allows the user to keep track of the eligible nodes. Note that the LP solution will not be available from this callback.
2. This callback is invoked only for nodes that are pruned from the active node pool. If the current node gets cut off then the infnode callback is invoked to report this.
Related topics
problem.removeNodecutoffCallback, problem.addOptnodeCallback, problem.addInfnodeCallback, problem.addIntsolCallback.

Parent Topic Methods of the class problem

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