solution file and rew as input

Answered

Matthew Galati

• March 03, 2024 23:33

I want to share my solution file (warm-start) and MPS file with support. However, I want to remove col/row names. I have a .sol and .mps file that work together fine, but when I try to input .sol and .rew, it obviously can't match up the input solution. 

To generate the files I used:

            grbModel.write("test.rew");
            grbModel.write("test.mps");
            grbModel.set(GRB.StringParam.SolFiles, "test");

What is the best way to share with support an MPS file (obfuscated) and a starting solution (since by default, the solver struggles to find a first solution)?

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• 

  Gurobot (AI-generated response)

  Gurobi Staff

  • March 04, 2024 15:52

  To share an obfuscated MPS file and a compatible warm-start solution file with Gurobi support:

  1. Obfuscate MPS File: Replace column and row names in the MPS file with generic identifiers (e.g., COL001, ROW001).

  2. Update Solution File: Modify the .sol file to match the new names in the obfuscated MPS file.

  3. Check Consistency: Ensure the obfuscated MPS and updated solution file are consistent by loading them in Gurobi.

  4. Share with Support: Send the consistent obfuscated MPS and solution files to Gurobi support, explaining the obfuscation for context.

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• 

  Ahmed Azab

  Gurobi Staff

  • March 05, 2024 02:00

  Hi Matthew,

  The following Python code can also do what you are looking for.

  import gurobipy as gp
  
  m1 = gp.read("test.mps")
  m1.read("test.sol")
  m1.params.SolutionLimit=1
  m1.optimize()
  m1.write("test.rew")
  
  m2= gp.read("test.rew")
  A = m2.getAttr("VarName", m2.getVars()) #Get variables names from rew file
  
  m1.setAttr("VarName", m1.getVars(), A) #Replace variable names in m1 with names from rew 
  m1.write("test1.sol") 

  The variables names in test1.sol should match the names in the rew file 

  I hope this can help

   

  Thanks 

  - Ahmed

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