Definition. Update proposal [ftip-006C]
Definition. Update proposal [ftip-006C]
Given a current parameter--optimizer state \((\theta _n,z_n)\), selected records, their attempt annotations, and credit targets, an update proposal is a candidate next state
\[(\widetilde \theta _{n+1},\widetilde z_{n+1}, \delta _n^{\rm diag}).\]The diagnostic record \(\delta _n^{\rm diag}\) contains the quantities required by the declared acceptance rule. It is distinct from the accept--reject decision \(d_n\) recorded for the proposal. Constructing the proposal incurs update cost even if the proposal is later rejected.