Re: [Bug-gnubg] Question about the Hint Window Evals

[Pablo Sangster]

Firstly my apologies for remaining anonymous.
My name is Pablo Sangster
Thanks you for your quick response.

Øystein O Johansen wrote:
> Hi Mr. X
>
> I must say I don't like replying to anonymous posters and I usually
> never reply to anyone that doesn't even state their name. I generally
> find it rude and I can't see any good reason for hiding ones identity.
>
> However I will make this one exception from not replying to anonymous
> posters, simply because I was the one who made the user interface
> changes to fit the pruning net evaluations.
>
> > In the Hint window (for checker play) there are buttons marked
> > Eval ... 0 1 2 3 4
> > Where can I toggle the pruning on/off  for the 2-ply button?
>
> The evaluation context for these buttons are (unfortunately) hard
> coded. It's therefore not possible to turn the pruning off for these
> buttons without recompiling. Sorry!
>
> > Occasionally when the filters are not wide enough to catch a move
> > I want evaluated at 2 ply in the hint window, I select the move and
> > hit the 2 button. But this seems to give me a PRUNED eval.
>
> You can of course press the "..." button and turn off the pruning
> neural nets for the evaluations done with the "Eval" button. If I
> coded the cache key calculation correctly to take the prune net
> setting into account, the evaluation will be redone without use of
> the pruning nets.

Yes thank you for this tip. It didn't occur to me.

> To smart folks reading: Did I get the cache key calculation right?
> If someone can take a look at the cache key code I modified, and
> then confirm it's good, I will be thankful.
>
> By the way Mr. X: Are you sure you understand the consept of the
> pruning neural nets? It's importatant to understand that the
> pruning nets are only used when selecting moves inside the deeper
> plies, and then only to prune away bad candidates. Using the pruning
> nets does really seldom makes a big difference to an evaluation.

Yes I fully understand how the pruning neural nets work.
However my speciality is backgames and I am finding that there are enough
differences between the prune and full nets to matter.
BTW I think GNU could do with some more training in developing backgames...

> This is also why we've choosen to use the pruning nets for the
> predefined buttons in hint windows. It's really not much lost, but
> the speed increased is really something. That's why it's set to
> default on for all deeper ply searches.
>
> -Øystein
>
>
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