Well, you can simply do the following:
Start with top 3 models named top1, top2, top3 Keep all 3 in disk cache during run Build logic to rate new model during run depending on it's standing compared to top 3 Decide on new standing of top 3 Perform update_weights_package on the relevant "new" top 3 models once per modelThis is only from the top of my head. I'm sure you could create something better without even the need to cache 3 models during the run