Model.cbProceed()


Model.cbProceed()

cbProceed ( )

Generate a request to proceed to the next phase of the computation. This routine can be called from any callback. Note that the request is only accepted in a few phases of the algorithm, and it won't be acted upon immediately.

In the current Gurobi version, this callback allows you to proceed from the NoRel heuristic to the standard MIP search. You can determine the current algorithm phase using MIP_PHASE, MIPNODE_PHASE, or MIPSOL_PHASE queries from a callback.

Example usage:

  def mycallback(model, where):
    if where == GRB.Callback.MIPSOL:
      phase = model.cbGet(GRB.Callback.MIPSOL_PHASE)
      obj = model.cbGet(GRB.Callback.MIPSOL_OBJ)
      if phase == GRB.PHASE_MIP_NOREL and obj < target_obj:
        model.cbProceed()

  model.optimize(mycallback)