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

From: Øystein O Johansen
Subject: Re: [Bug-gnubg] Question about the Hint Window Evals
Date: Wed, 2 Feb 2005 11:35:00 +0100

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.

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.

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.


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