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## Re: [Bug-gnubg] Questions on pruning net

 From: Joseph Heled Subject: Re: [Bug-gnubg] Questions on pruning net Date: Thu, 25 Nov 2004 09:39:04 +1300 User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040616

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Ian Shaw wrote:
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```-----Original Message-----
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From: Joseph Heled [mailto:address@hidden Sent: 23 November 2004 21:24
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Ian Shaw wrote:

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I think most of you still miss the point of the prune nets. It just pre-filters the options in a move selection *inside a higher ply*. If the move is on it's top 10 list, the error is 0. If not, the error is the equity difference between the top move on the list and the top *0 ply* move.
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So the pruning nets pick the pest 10 moves, then these 10 moves are evaluated
using the main net as before.

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```Exactly.
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2. How strong are the pruning nets in their own right? How do they compare with 0-ply?
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[snip interesting details] Do you equivalent numbers for 1-ply and higher?

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```So, prune error rate per move is ~ three time higher than 0 ply.

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... but about 10 times worse on cube decisions. I don't really understand how
this can be, since you are still looking at play selections to evaluate the
overall cube equity.

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Why not? Cube decisions are more difficult, since you need to get the probabilities right. move selection is about relative numbers. (There is no move selection involved in 0-ply cube actions ..)
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-Joseph

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