How do you set the MIP gap with docplex?
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...
Accepted answer
The mipgap is a tolerance, not a limit. Try
model.parameters.mip.tolerances.mipgap = 0.05
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
Thanks for pointing this out. I have reported the issue to the maintainers.