Decision Optimization

Decision Optimization

Delivers prescriptive analytics capabilities and decision intelligence to improve decision-making.


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  • 1.  How to generate smaller set of infeasible constraints using conflict option

    Posted 12/06/17 01:51 AM

    Originally posted by: abhikgiri


    Hi, 

    Using 12.6.2, I get a CLP file with 1655 constraints. I suspect that it is possible to generate a much smaller set of infeasible constraints. 

    I am OK if CPLEX takes some more time and reduces this minimal set. What is the option that I need to try for this?

    I am running CPLEX from command prompt.

    Thank you!

     


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  • 2.  Re: How to generate smaller set of infeasible constraints using conflict option

    Posted 12/06/17 05:39 AM

    Did you let the conflict refiner run to the bitter end or did you stop it prematurely?


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  • 3.  Re: How to generate smaller set of infeasible constraints using conflict option

    Posted 12/07/17 09:10 AM

    Originally posted by: abhikgiri


    I didn't stop prematurely. I did some experimentation: with default mode, CPLEX takes 0.03 sec and finds 1655 constraints as IIS. With mode = 1, CPLEX takes 0.42 sec and finds 1605 constraints as IIS (just 50 less :( )

    Also, I have another MILP problem where CPLEX does not generate CLP even in 3-4 hours. Anything can be done here?


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