I imagine that at low visits at least, "ACT" behaves similarly to Leela Zero's "LCB" move selection, which also has the effect of sometimes selecting a move that is not the max-visits move, if its value estimate has recently been found to be sufficiently larger to balance the fact that it is lower prior and lower visits (at least, typically, this is why the move wouldn't have been the max visits move in the first place). It also scales in an interesting way with empirical observed playout-by-playout variance of moves, but I think by far the important part is that it can use sufficiently confident high value to override max-visits.
The gain from "LCB" in match play I recall is on the very very rough order of 100 Elo, although it could be less or more depending on match conditions and what neural net is used and other things. So for LZ at least, "ACT"-like behavior at low visits is not new. On Sun, Jul 19, 2020 at 5:39 AM Kensuke Matsuzaki <knsk.m...@gmail.com> wrote: > Hi, > > I couldn't improve leela zero's strength by implementing SEARCH and ACT. > https://github.com/zakki/leela-zero/commits/regularized_policy > > 2020年7月17日(金) 2:47 Rémi Coulom <remi.cou...@gmail.com>: > > > > This looks very interesting. > > > > From a quick glance, it seems the improvement is mainly when the number > of playouts is small. Also they don't test on the game of Go. Has anybody > tried it? > > > > I will take a deeper look later. > > > > On Thu, Jul 16, 2020 at 9:49 AM Ray Tayek <rta...@ca.rr.com> wrote: > >> > >> > https://old.reddit.com/r/MachineLearning/comments/hrzooh/r_montecarlo_tree_search_as_regularized_policy/ > >> > >> > >> -- > >> Honesty is a very expensive gift. So, don't expect it from cheap people > - Warren Buffett > >> http://tayek.com/ > >> > >> _______________________________________________ > >> Computer-go mailing list > >> Computer-go@computer-go.org > >> http://computer-go.org/mailman/listinfo/computer-go > > > > _______________________________________________ > > Computer-go mailing list > > Computer-go@computer-go.org > > http://computer-go.org/mailman/listinfo/computer-go > > > > -- > Kensuke Matsuzaki > _______________________________________________ > Computer-go mailing list > Computer-go@computer-go.org > http://computer-go.org/mailman/listinfo/computer-go >
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