Iteration
One point of a cell's iteration trace: the solver's progress at the end of an iteration, recorded when the experiment captures traces. Iteration 0 is the initialized state before the first main iteration.
Parameters
the solver's iteration counter at the snapshot
the solver's cumulative requested replications at the snapshot — the x-axis for budget-normalized convergence plots
the penalized objective (minimization-oriented) of the best solution found so far
the solver's algorithm-specific state at the snapshot, keyed by the names the solver chose — a swarm's diameter, a population's diversity, a reference distribution's coefficient of variation. These are the direct measurements of premature convergence, and the solvers emit them every iteration whether or not anyone records them. Empty unless the experiment captured solver state, and for solvers that publish none.