The run is taking shape: EER {value_pct} at epoch {epoch} — down at least 40% from its first reading.
Epoch {epoch}: EER {value_pct}, a change of {delta_pct} points since the previous reading. The run has reached its understanding phase.
Understanding: EER {value_pct} at epoch {epoch} — holding at, or within 1% of, the best this run has reached.
