blockquote, div.yahoo_quoted { margin-left: 0 !important; border-left:1px
#715FFA solid !important; padding-left:1ex !important; background-color:white
!important; } During its training, AlphaGo played many handicap games against a
previous version of itself, so the team and the program are acquainted with
handicap play. I don't recall reading any discussion of komi experiments.
Google's advantage is that they can dynamically spin up bunches of processors
to try all sorts of experiments, including tournaments designed to test various
versions, theories, and tweaks. There was some discussion about what to do if
one could spin up thousands of processr cores on demand.
There are surely large businesses in China which could do the same. They have
similar reasons to pursue deep learning and other creative uses of big data and
supercomputing.
Sent from Yahoo Mail for iPad
On Thursday, January 5, 2017, 9:36 PM, David Ongaro <[email protected]>
wrote:This discussion reminds me of an incident which happened at the EGC in
Tuchola 2004 (maybe someone can find a source for this). I don’t remember all
details but it was about like this:
Two amateur players where analyzing a Game and a professional player happened
to come by. So they asked him how he would assess the position. After a quick
look he said “White is leading by two points”. The two players where wondering:
“You can count that quickly?”, but the pro answered “No, I just asked myself if
I would like to have black in this position. The answer is no. But with two
extra Komi for Black it would feel ok.”
So it seems professionals already acquired some kind of “value network” due to
their hard training, but they also can modify its assessments by taking Komi
into account. Maybe that's something we also should do, i.e. not only train the
value network by taking go positions and results into account but also add the
Komi as an input (the output would still be a simple win/lose result). In that
way we don’t have to train a different network for each Komi, even though the
problem getting enough training data for all Komi values still remains.
On Jan 5, 2017, at 11:44 AM, David Ongaro <[email protected]> wrote:
On Jan 5, 2017, at 2:37 AM, Detlef Schmicker <[email protected]> wrote:
Hi,
what makes you think the opening theory with reverse komi would be the
same as with standard komi?
I would be afraid to invest an enormous amount of time just to learn,
that you have to open differently in reverse komi games :)
Thats why I used the comparative adjective “less”. It might not be ideal, but
still much better than changing the fundamental structure of the opening with
an extra stone. Furthermore the effect might not as big as you think:
1. The stronger player doesn’t have to play overplays when the handicap is
correct. If the handicap is correct and if AlphaGo “knows” that is another
question though… Of course the weaker player might play differently (i.e. more
safely) but at least that is something he or she can control
2. One could even argue the other way around: we might see more sound
(theoretically correct) moves from AlphaGo with reverse Komi. If it's seeing
itself ahead already during the opening it might resort to slack but safe
moves. Since it’s still winning we can be left wondering if it was actually a
good move. But if it does an unusual looking move which it can’t be considered
an overplay but it’s still winning in the end with reverse Komi there should be
a real insight to gain.
Still, a reverse Komi handicap is rather big, but it might be the next best
thing we have without retraining the value network from scratch. Furthermore
retraining the value network will probably affect the playing style even more.
Thanks,
David O.
Am 05.01.2017 um 10:50 schrieb Paweł Morawiecki:
2017-01-04 21:07 GMT+01:00 David Ongaro <[email protected]>:
[...]So my question is: is it possible to have reverse Komi games
by feeding the value network with reverse colors?
In the paper from Nature (subsection "Features for policy/value
network"), authors state:
*the stone colour at each intersection was represented as either
player or opponent rather than black or white. *
Then, I think the AlphaGo algorithm would be fine with a reverse
komi. Namely, a human player takes black and has 7.5 komi. The next
step is that AlphaGo gives 2 stones of handicap but keeps 7.5 komi
(normally you have 0.5).
Aja, can you confirm this?
Also having 2 stone games is not so interesting since it would
reveal less insights for even game opening Theory.
I agree with David here, most insights we would get from even
games. But we can imagine the following show. Some games are played
with a reverse komi, some games would be played with 2 stones (yet,
white keeps 7.5 komi) and eventually the main event with normal
even games to debunk our myths on the game. Wouldn't be super
exciting!?
Best regards, Paweł
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