where s is the active set of determinants subsequent to taking the action a = (p, q), as defined in Eq. ( ). One advantage of this choice is that the information in Q w (s, a) is completely captured in the weights w. Furthermore, the weights w, which are independent of s and a, can be interpreted as maintaining a global ranking for the set of all possible determinants. The definition of the feature vectors in Eq. ( ) can be interpreted as mapping the expected value of an action a = (p, q) to the anticipated change in energy by removing determinant p and replacing it with determinant q. In other words, this choice for f i (s, a)