When unspecified always assume the natural logarithm. For UCT this does not really matter; only a different tuning constant.
log10(x) == ln(x) / ln(10) Erik On Mon, Dec 1, 2008 at 3:22 PM, Mark Boon <[EMAIL PROTECTED]> wrote: > Just now I realized that I'm using the standard Java Math.log() function in > places where it computes the log(visits). In Java, this log() function is > actually the logarithm of base e, which I suppose is normally actually > written as ln(). When I read articles about UCT and it says log(), does that > actually mean log base e, or log base 10? > > I figured it probably won't make an awful lot of difference. But there > should be some difference. Just to make sure I replaced Math.log() by > Math.log10(). Now I'm seeing a slight degradation of play, so I suppose that > should answer the question. That doesn't surprise my an awful lot, somehow > intuitively it seems to make more sense to use log base e. But maybe > adjusting the exploration-factor a little would bring them closer still. I > just wanted to make sure... > > Another thing I tried was replacing log(virtual-parent-visits) by > log(parent-visits) in the RAVE calculation. I see no effect on the level of > play, so apparently it's a wash. But using the latter saves a little memory > and / or (depending on your implementation) a little performance since the > log() function is expensive. > > Mark > > > > _______________________________________________ > computer-go mailing list > computer-go@computer-go.org > http://www.computer-go.org/mailman/listinfo/computer-go/ > _______________________________________________ computer-go mailing list computer-go@computer-go.org http://www.computer-go.org/mailman/listinfo/computer-go/
