jirayu_sri/stockfish
1
0
Fork 0
mirror of https://github.com/official-stockfish/Stockfish.git synced 2026-07-22 12:47:08 +00:00
Code Issues Packages Projects Releases Wiki Activity

Remove small net

Browse Source 
Failed VVLTC non-regression
https://tests.stockfishchess.org/tests/view/69d562b84088e069540a2288
LLR: -2.96 (-2.94,2.94) <-1.75,0.25>
Total: 386998 W: 99181 L: 99760 D: 188057
Ptnml(0-2): 35, 35792, 122429, 35203, 40

Failed STC non-regression
https://tests.stockfishchess.org/tests/view/69f3c6601e5788938e86a99e
LLR: -2.93 (-2.94,2.94) <-1.75,0.25>
Total: 33696 W: 8492 L: 8795 D: 16409
Ptnml(0-2): 124, 4209, 8504, 3868, 143

Many thanks to Dubslow, Torom, ces42, Shawn, vondele, Disservin and others for discussion.

## Summary

The venerable small net has been around for quite some time now, and while the big net architecture has substantially advanced with TI, the small net has stayed with plain HalfKA. It therefore presents a few burdens: multiple net architectures to maintain, multiple nets to train, and a whole lot of templates to deal with the variable L1 size.

Locally I measure a slowdown of -2.5% in NPS with this branch – and it's probably more on non-AVX512 architectures – but a pure slowdown of that magnitude would lead to more dramatic losses (even at VVLTC) than exhibited in the above tests, suggesting that the small net's lower eval quality is deleterious.

Bonus: Shawn found this interesting PGN among the VVLTC games: https://lichess.org/study/hvo8jflc/OeTOityv  `master` seems to misevaluate the fortress because all positions go to small net (the material difference is larger than the threshold).

closes https://github.com/official-stockfish/Stockfish/pull/6796

Bench: 2877007
This commit is contained in:
anematode
2026-05-04 08:32:42 +02:00
committed by Joost VandeVondele
parent dc1686345c
commit ab8f901d25
18 changed files with 365 additions and 695 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/universal/nnue_embed.cpp
+3 -11
View File
@@ -2,15 +2,7 @@
#include "../evaluate.h"
extern const unsigned char gEmbeddedNNUEBigData[] = {
#embed EvalFileDefaultNameBig
extern const unsigned char gEmbeddedNNUEData[] = {
#embed EvalFileDefaultName
};
extern const unsigned int gEmbeddedNNUEBigSize = sizeof(gEmbeddedNNUEBigData);
extern const unsigned char* const gEmbeddedNNUEBigEnd = gEmbeddedNNUEBigData + gEmbeddedNNUEBigSize;
extern const unsigned char gEmbeddedNNUESmallData[] = {
#embed EvalFileDefaultNameSmall
};
extern const unsigned int gEmbeddedNNUESmallSize = sizeof(gEmbeddedNNUESmallData);
extern const unsigned char* const gEmbeddedNNUESmallEnd =
gEmbeddedNNUESmallData + gEmbeddedNNUESmallSize;
extern const unsigned int gEmbeddedNNUESize = sizeof(gEmbeddedNNUEData);