NNUE

[Krzysztof Grzelak]

I interrupted the match because Scan_nnue lost all of them in 5 games. Bert, please share everything you need for in one folder Scan 3.1_nnue.

[BertTuyt]

First try to put the .gnn file in the scan data folder.
And in the same folder where you have scan, put the nnue .exe version and the modified ini file, then all should work.

Please let me know if you still have issues.

Bert

[BertTuyt]

Next it could be that your Threadripper (which was the 1st generation) has a very slow AVX2 implementation.
We have seen the same with pext.
Unfortunately there is no bypass for avx2, which was the case with pext.

To test this, please start scan nnue, and type the next commands:
hub
init
pos start
level depth=26
go

This will start a base search ply 26 from the start position.
If you make a screenshot from the result, i can compare if the number of nodes match with my version, and how the timing compares with my processor (note, please do the test with only 1 thread).

Thanks for your support,

Bert

[Sidiki]

Thanks Bert for this release and test.

I have a problem, the first Scan nnue's version work very well on my computer.

The newer don't work when i open it, it says Scan31_nnue.exe stop working. I have a Windows 8 Intel Celeron with 16 Go of Ram.

I don't know if the problem come from the compilation that's isn't compatible with my computer. Thanks to help me.

Friendly, Sidiki.

[BertTuyt]

Sidiki,

the scan_nnue (exe) version should be installed in the same directory as scan.exe
The network file (.gnn) should be included in the data folder.
In the ini file the name of the network file should be included (see example in the dropbox folder containing the modified .ini file).

Bert

[Sidiki]

Bert,

Thanks for your answer, i tried the process. But still the same. My Windows 8, seem to not run. BMI2 exe.

A question, this release it's simple 64 bits exe or compiled to 64 bits BMI2.

Thanks, because I have some chess engines in BMI2 that still stopping when i launch them.

Thanks to see an issue for me.

Friendly, Sidiki.

[BertTuyt]

Sidiki, yes the compile is 64bits with BMI2, and AVX2.

Can you give the exact name and number of you Celeron processor, so i can check if it has the right capabilities?

Bert

[BertTuyt]

Sidiki,

with the tool cpu-z you can check the instruction sets of your processor.
AVX2 should be included, otherwise the program does not run.

Basically i should include a check at program start, and then message if the processor is capable/incapable.
But i did not want to modify the original scan source code too much.

Bert

[Sidiki]

Hi Bert,

This's the scrennshot

cpu.PNG (27.96 KiB) Viewed 7758 times

Thanks

Friendly, Sidiki.

[BertTuyt]

Sidiki,

apparently your processor does not seem to support avx2, in which case it wont run my implementation of nnue.

Bert

[Krzysztof Grzelak]

Dear Bert,
can you share the entire Scan 3.1 nnue folder.

[Krzysztof Grzelak]

For me, this new version also does not work.

[BertTuyt]

To test scan nnue in hub mode, add hub on the target line (rightclick the shortcut on the desktop), see screenshot.

When you test with:
hub
init
pos start
level depth=26
go

The result should be:

Code: Select all

info depth=26 mean-depth=24.4 score=-0.06 nodes=157826728 time=29.519 nps=5.3 pv="32-28 20-25 37-32 14-20 41-37 10-14 31-26 17-21 26x17x21 12x21x17 34-30 25x34x30 40x29x34 21-26 45-40 7-12 40-34 1-7 50-45 5-10 46-41 16-21 36-31 21-27 31x22x27 18x27x22 32x21x27 26x17x21 44-40 19-23 29x18x23 12x32x18x28 37x28x32"
done move=32-28 ponder=20-25

nps is on every machine different.

Bert

Capture.PNG (14.61 KiB) Viewed 7644 times

[Krzysztof Grzelak]

I did the test - there was no problem.

[Joost Buijs]

It looks as if the network file is not loaded. Scan-NNUE doesn't seem to check if the file is present or not.
The file nn_20210328.gnn should be in the data folder. I had the same issue here too.