RL-CSP is linear and, for each action, it requires an individual coordinate for each feature and the free term. Since RL-CSP parameterizes the state space by only one feature, the energy per atom ( ), it needs two coordinates in the policy vector for each of the n actions, thus the length of is 2n. When the policy vector is initialised at the beginning of the CSP calculation, all of its coordinates are set to zero. This ensures that all actions are equally likely to be selected independently of the state energy ( ). We refer to such policy as uniform.