Partition Heuristic

Answered

Gerwin Gamrath

• April 24, 2019 14:12

I want to test the new "Partition Heuristic".

When setting the parameter Partition (http://www.gurobi.com/documentation/8.1/refman/partition.html#attr:Partition) the following was not clear to me:

Short question: What is the default value for the Partition parameter?

Longer question: Let's say i have 7 different days. I also have a class of variables Y(i) for each day... Monday has variables Y(1), Tuesday has variables Y(2) and so on...
Then all vars in Y(1) will get Partition=1, all vars in Y(2) will get Partition 2, and so on...
But I also have some global / day-independent variables. When I don't set a Partition parameter for these variables, will they be excluded (Partition = -1) or included (Partition = 0) for every sub-MIP?

What I want is more the second: For example: Only focus on monday (and all global) variables and "ignore" the other days for this moment. 
Would be nice (for me) if this is the default and I don't have to care for the other variables and yet-to-come variables...

 

Thanks,
Gerwin

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  Daniel Espinoza

  • April 25, 2019 13:06

  Hi Gerwin,

   

  The default value for the partition attribute is -1, so any variable for which its partition attribute is not set will be excluded in all sub-problems. Thanks for pointing out the gap in the docs.

   

  Best,

  Daniel

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  Gerwin Gamrath

  • April 25, 2019 13:14

  

  

  

  Hello Daniel,

  thanks for the clear answer.
  
  Best,
  Gerwin

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