Three main approaches for L2O (IMAGE) Science China Press Caption The top figure illustrates training performance prediction models, which can be used to predict the best-performing algorithm on unseen problem instances. The middle figure shows training a single solver, which is directly applied to any unseen problem instance. The bottom figure represents training a portfolio of solvers, which is directly applied to any unseen problem instance. Credit ©Science China Press Usage Restrictions Use with credit. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.