Can I add enforce cblazy at MIPNODE?

Answered

Kaijiang Wu

April 18, 2025 20:40

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Hi 

I just want to ask, if  I am allowed to check the  relaxzation solution of a MIP and enforce a lazy constraint there that would cut  off some feasible solution. Because I am trying to remove some non-optimal feasible  region and check at the relaxzation part. 

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  Riley Clement

  • Gurobi Staff

  April 23, 2025 00:15

  Hi Kaijiang,

  Can I add enforce cblazy at MIPNODE?

  Yes you can.  From the cbLazy docs:

  Add a new lazy constraint to a MIP model from within a callback function. Note that this method can only be invoked when the where value on the callback function is GRB.Callback.MIPNODE or GRB.Callback.MIPSOL (see the Callback Codes section for more information).

  The callback examples will also help with your implementation.

  - Riley

   

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