An example of the convergence behavior with respect to episode for the previous three test cases is given in Fig. , which depicts the difference between the best estimate of the energy at each episode and the lowest energy obtained overall. Each of the molecules (CO, H 8 chain, and N 2 ) was fixed with an interatomic distance of 1.5 Å and otherwise used the same parameters as those given previously. To explore the impact of the the dimension of the external determinant search space |S 2 | was allowed to vary, with |S 2 | = 50, 100, 200.