To answer one other question: we were told that Mogo scales linearly. The
supercomputer has a very high-bandwidth interconnect. The Mogo team was unable
to release more architectural details at this time.
To reiterate on another question, from what the team said, no book, no joseki,
just raw search using billions and billions of galloping CPU cycles. Some of
the plays were described by the pro as "5 dan level" -- effectively, Mogo
generated joseki from whole cloth. I was impressed.
Check out the KGS records. If my memory is correct, the userid was MogoTitan.
I'd love to hear feedback from stronger players, but it seemed to me that, as
Mogo was given more time, its opening and middlegame play was markedly better.
I have a question: Is the allocation of time front-weighted, to take advantage
of the fact that much less effort is required to calculate end-game plays,
since the playouts are so much shorter? The playouts are shorter, the search
tree has fewer branches; the time needed should decay rapidly.
I still have this theory that when the level of the program is in the high-dan
reaches, it can take proper advantage of an opening book. Alas, it may be a few
years before enough processoring power is routinely available to test this
hypothesis. I know that we duffers can always ruin a perfectly good joseki just
as soon as we leave the memorized sequence.
----- Original Message ----
From: Darren Cook <[EMAIL PROTECTED]>
> I do have to ask -- if 1.7 million playouts per second and an hour of playing
> time are required to reach this level, ...
Can Olivier give us more details. A few questions that come to mind: how
many playouts per *move* was it using in each of the opening, middle
game and endgame? Was it using a fuseki book, and how many moves did the
game stay in that book? And once it was out of the book was it all UCT
(*) search, or were there any joseki libraries, etc.?
I'd also be interested to hear how inefficient the cluster was (e.g.
1000 CPUs won't be doing 1000 times the number of playouts, there must
be some overhead).
Darren
*: Sorry, I've forgotten the new term we are supposed to use.
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