The best entry on the leaderboard, or null when empty. Single-pass O(n) max (no full sort) using the SAME ordering as rankLeaderboard: higher Metric wins, ties broken by the lexicographically-smaller IterationID.
null
Metric
IterationID
the (unranked or ranked) entries
The best entry on the leaderboard, or
nullwhen empty. Single-pass O(n) max (no full sort) using the SAME ordering as rankLeaderboard: higherMetricwins, ties broken by the lexicographically-smallerIterationID.