Originally posted by: fragolka

Hi there...

I am solving a scheduling problem and I want to use the edge-finding algorithm to solve it. I have read that the ILOG CPLEX Studio supports the edge-finder. However, I can't find any option how to set the edge finder. I was told the edge finder had to be set up in the old version. How does it works in the new versions? Is the edge-finder autamatically used whenever I define the scheduling variables and functions (intervals, cummul function, precedence etc.)?

Thanks a lot for answering

Lucie
#CPOptimizer
#DecisionOptimization

Originally posted by: SystemAdmin

Hello Lucie.

Edge-finder is not used by default in CP Optimizer. In order to turn in on it is necessary to set parameters CumulFunctionInferenceLevel and/or NoOverlapInferenceLevel to value Extended or Medium. In OPL can be be done the following way:

execute 
{ cp.param.CumulFunctionInferenceLevel = 
"Extended"; cp.param.NoOverlapInferenceLevel = 
"Extended"; 
}

And in C++, assuming cp is an instance of IloCP:

cp.setParameter(IloCP::CumulFunctionInferenceLevel, IloCP::Extended); cp.setParameter(IloCP::NoOverlapInferenceLevel, IloCP::Extended);

On Extended level you get the maximum filtering power. For cumulative includes timetable edge finding, disjunctive constraint and timetable. For disjunctive it is edge finding, not-first/not-last, detectable precedences and timetable. Medium level is lighter but less powerful.

Best regards, Petr
#CPOptimizer
#DecisionOptimization

Originally posted by: fragolka

Thank you, Peter. Your answer helps a lot.

Lucie
#CPOptimizer
#DecisionOptimization