[computer-go] greenpeep

[Yamato]

Christopher Rosin wrote:
>greenpeep's patterns include the local 3x3 neighborhood.  In addition,
>for each of the four nearest neighbors, it includes liberty count info if
>that neighbor is occupied, or otherwise info about 2-away point just
>beyond that neighbor if the neighbor itself is empty.

Liberty information in patterns is a good idea.
That might contribute to improve the quality of playouts.

>1) basic UCT with self-play patterns in the MC playouts.  This had no other
>MC
>biases for locality, captures, etc., and did not use patterns to bias UCT
>choices,
>and did not use all-moves-as-first: 24%
>2) like (1), but replacing self-play patterns by an implementation of MoGo's
>full scheme for MC playouts (as described in the MoGo report RR-6062);
>this doesn't use the self-play patterns at all: 47%
>3) like (2), but using the self-play patterns to bias the MoGo MC scheme's
>final fallback to random global moves: 54%
>4) to (3), add self-play pattern bias in UCT tree, and all-moves-as-first:
>77%
>5) Like (4), but replacing MoGo's local-move patterns by locally restricted
>self-play patterns (so this is no longer using MoGo's hand-coded patterns,
>but still uses the explicit preference for captures/saves and local moves):
>84%

Thanks for interesting results.

--
Yamato