Search found 1154 matches

by Gian-Carlo Pascutto
Wed Sep 09, 2020 3:21 pm
Forum: Computer Chess Club: General Topics
Topic: AVX-512 and NNUE
Replies: 11
Views: 1489

Re: AVX-512 and NNUE

syzygy wrote:
Tue Sep 08, 2020 11:53 pm
Gian-Carlo Pascutto wrote:
Tue Sep 08, 2020 6:15 pm
Has anyone benchmarked Stockfish NNUE's performance on an AVX-512 system with an AVX-512 build? How does it compare to a Zen2 AVX2 build?
This seems to get close:
https://github.com/official-stockfish/S ... -678426702
Thanks. So no point in getting AVX512 hardware.
by Gian-Carlo Pascutto
Tue Sep 08, 2020 6:15 pm
Forum: Computer Chess Club: General Topics
Topic: AVX-512 and NNUE
Replies: 11
Views: 1489

AVX-512 and NNUE

Has anyone benchmarked Stockfish NNUE's performance on an AVX-512 system with an AVX-512 build? How does it compare to a Zen2 AVX2 build?
by Gian-Carlo Pascutto
Fri Aug 07, 2020 9:16 am
Forum: Computer Chess Club: General Topics
Topic: this will be the merge of a lifetime : SF 80 Elo+
Replies: 121
Views: 20297

Re: this will be the merge of a lifetime : SF 80 Elo+

This makes sense but I don't think this is the optimal way to go about this. Of course in quiet positions 50% less nps is not as critical as in the endgame, but I believe even in the endgame the NN evaluation can have a better evaluation in many positions. They could yes, but clearly overall it's b...
by Gian-Carlo Pascutto
Tue Aug 04, 2020 6:30 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: NNUE accessible explanation
Replies: 12
Views: 5001

Re: NNUE accessible explanation

Notably, my understanding is nodchip also has as input for each square whether a capture occured there. Ha, interesting, there's a lot of tricks one can do here. You can also cheat with piece types. It's not clear to me whether NNUE can distinguish between castling state right now? But you can fix ...
by Gian-Carlo Pascutto
Tue Aug 04, 2020 6:03 pm
Forum: Computer Chess Club: General Topics
Topic: Is this SF NN almost like 20 MB book?
Replies: 30
Views: 2616

Re: Is this SF NN almost like 20 MB book?

... If one engine can use 100M of data files, then so should the others. Doesn't matter what is contained in them. ?? Some tournaments disallow "books" but allow "neural networks", even if this distinction does not exist in reality, because you can train a neural network to remember openings.
by Gian-Carlo Pascutto
Tue Aug 04, 2020 6:01 pm
Forum: Computer Chess Club: General Topics
Topic: this will be the merge of a lifetime : SF 80 Elo+
Replies: 121
Views: 20297

Re: this will be the merge of a lifetime : SF 80 Elo+

There's still so much room for experimentation. And I suspect that trying and training new approaches is quite a bit faster on a 20M NNUE net compared to a Leela one...

Dream situation for computer chess.
by Gian-Carlo Pascutto
Tue Aug 04, 2020 5:59 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: NNUE accessible explanation
Replies: 12
Views: 5001

Re: NNUE accessible explanation

On CPU, LC0 relies on Blas. Afaik Blas backends can be used interchangeably and share the same basic interface. There's an Eigen backend as well, but it is just used for basic matrix/matrix multiplies, i.e. as an alternative BLAS library. Giraffe relies on Eigen. I am not really familiar with Eigen...
by Gian-Carlo Pascutto
Tue Aug 04, 2020 5:51 pm
Forum: Computer Chess Club: General Topics
Topic: Is this SF NN almost like 20 MB book?
Replies: 30
Views: 2616

Re: Is this SF NN almost like 20 MB book?

People should start learning how NN works? If you give a NN a ton of opening positions to learn, it will definitely learn to remember them. But for NNUE it is more complicated. The output does not contain move recommendations, just the evaluation of the position. I don't think the current learning ...
by Gian-Carlo Pascutto
Thu Jun 04, 2020 11:29 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Total noob Leela question
Replies: 12
Views: 2268

Re: Total noob Leela question

So far I have payed zero attention to the LeelaChess Zero project, as I have no good GPU. But now I want to do some testing at ultra-low node count, and I suppose a CPU-only version would be good enough for that. What would I have to do to run a game with LC0-CPU as UCI engine? I downloaded an arch...
by Gian-Carlo Pascutto
Mon Jun 01, 2020 2:50 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Ryzen 2 and BMI2?
Replies: 52
Views: 19910

Re: Ryzen 2 and BMI2?

Gerd Isenberg wrote:
Sat May 30, 2020 4:21 pm
I agree it is a shame, that Zen is so slow with pext. AMD has to spent some transistors for a fast hardware pext in one cycle!
Note that Intel has several patents on the efficient implementation of those instructions.