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How do you set the MIP gap with docplex?

3100029SVY gravatar image
Question by pcacioppi  (89) | Jun 07, 2016 at 12:58 AM pythoncplexdocplex

Your __doc__ suggests the following.

 model.parameters.mip.limits.mipgap = 0.05

But that results in the following.

 DOcplexException: No parameter with name mipgap in parameters.mip.limits

This is a common parameter, no? There must be a way to do it with docplex...

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Answer by DanielJunglas (2796) | Jun 07, 2016 at 01:14 AM

The mipgap is a tolerance, not a limit. Try

 model.parameters.mip.tolerances.mipgap = 0.05
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pcacioppi

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3100029SVY gravatar image pcacioppi (89)   Jun 07, 2016 at 01:29 AM 0
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hooray!

BTW, the model.parameters.mip.limits.mipgap = 0.05 is in your code.

From within ipython i try ? m.paramters and get the following.

This property returns the root parameter group of the model.

The root parameter group models the parameter hirerachy. It is the way to access any CPLEX parameter and get or set its value.

Examples:

 model.parameters.mip.limits.mipgap

 Returns the parameter itself, an instance of the Parameter class.

 To get the value of the parameter, use the get() method, as in:

 model.parameters.mip.limits.mipgap.get()
 >>> 0.0001

 To change the value of the parameter, use a plain Python assignment:

 model.parameters.mip.limits.mipgap = 0.05
 model.parameters.mip.limits.mipgap.get()
 >>> 0.05

 Assigment is a snynonym for the set() method:

 model.parameters.mip.limits.mipgap.set(0.02)
 model.parameters.mip.limits.mipgap.get()
 >>> 0.02


Returns: the root parameter group, instance of ParameterGroup class.

PROOFREAD

270002S4SX gravatar image DanielJunglas (2796) ♦ pcacioppi (89)   Jun 07, 2016 at 11:09 AM 0
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Thanks for pointing this out. I have reported the issue to the maintainers.

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