title: Gurobi: Save model after presolve for reuse
body: <p>I'm looking for a way to save a presolved model in gurobi, so that I can save the time necessary for presolving the next time I'm running the model.</p>
  
  <p>I have tried to write the model to a .mps/.lp file using a callback function after presolve, but when I load the file it starts to presolve again.</p>
  
  <p>I'd also be thankful for negative answers, if what I'm looking for isn't possible.</p>
  
  <p>PS.: I'm using Gurobi 7.5.2 with python 3.6</p>