Chess engine: Caissa 1.8

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Caissa - UCI chess engine,  Author: Michał Witanowski
Rating CEDR=3496

v.1.8:
Refactor training data loading in neural net trainer
Experiment with Adam optimizer, different activation functions (both experiments failed)
New neural net and piece-square tables trained on 1.2B positions
Switch back to 1536 accumulator size
Increase last layer bucket count from 4 to 8
Two training sessions, 48 hours in total
Fix 'hashfull' reporting zero
Minor search tweaks

Individual statistics: Caissa 1.6.3 - 213 games (+ 66,= 86,- 61), 51.2  %
Schooner 2.2                  :   2 (+  2,=  0,-  0), 100.0 %
Critter 1.6a                  :   6 (+  4,=  2,-  0), 83.3 %
Xiphos 0.6.1                  :   2 (+  1,=  1,-  0), 75.0 %
Zahak 10.0                    :   2 (+  1,=  0,-  1), 50.0 %
Hiarcs 15.5                   :   2 (+  1,=  0,-  1), 50.0 %
Tucano 10.00                  :   2 (+  0,=  1,-  1), 25.0 %
RofChade 3.0                  :   4 (+  0,=  2,-  2), 25.0 %
Pedone 3.1                    :   2 (+  1,=  1,-  0), 75.0 %
Fisherov chess monk 1.2       :   2 (+  0,=  1,-  1), 25.0 %
Nemorino 6.00                 :   2 (+  0,=  2,-  0), 50.0 %
Blunder 8.5.5                 :   2 (+  2,=  0,-  0), 100.0 %
Fritz 18                      :   2 (+  0,=  2,-  0), 50.0 %
Arasan 23.4                   :   2 (+  0,=  2,-  0), 50.0 %
Revenge 3.0                   :   4 (+  0,=  2,-  2), 25.0 %
Weiss 2.1 dev                 :   2 (+  1,=  1,-  0), 75.0 %
Booot 7.0                     :   4 (+  3,=  0,-  1), 75.0 %
Marvin 6.1.0                  :   2 (+  1,=  1,-  0), 75.0 %
Fire NN 1072022               :   2 (+  0,=  2,-  0), 50.0 %
Seer 2.6                      :   4 (+  0,=  1,-  3), 12.5 %
Kayra 1.7                     :   2 (+  0,=  0,-  2),  0.0 %
Kuma 1.0                      :   2 (+  2,=  0,-  0), 100.0 %
RubiChess 20221203            :   4 (+  0,=  2,-  2), 25.0 %
Kookaburra 1.03a              :   2 (+  0,=  1,-  1), 25.0 %
Little Goliath 3.16           :   2 (+  1,=  1,-  0), 75.0 %
Dragon 3.2                    :   2 (+  0,=  0,-  2),  0.0 %
Minic 3.33                    :   2 (+  0,=  2,-  0), 50.0 %
Uralochka 3.39d               :   4 (+  1,=  3,-  0), 62.5 %
Blue Marlin 15.6              :   2 (+  0,=  1,-  1), 25.0 %
BrainLearn 21.1               :   2 (+  0,=  1,-  1), 25.0 %
Viridithas 7.0.0              :   4 (+  1,=  3,-  0), 62.5 %
Winter 2.0                    :   2 (+  2,=  0,-  0), 100.0 %
Eman 8.70                     :   4 (+  0,=  2,-  2), 25.0 %
Igel 3.4.0                    :   6 (+  0,=  4,-  2), 33.3 %
Polyfish 230202               :   2 (+  0,=  0,-  2),  0.0 %
ShashChess 28                 :   2 (+  0,=  1,-  1), 25.0 %
Mess 0.1.0                    :   2 (+  2,=  0,-  0), 100.0 %
Koivisto 9.2 hotfix           :   4 (+  0,=  3,-  1), 37.5 %
CorChess 20230210             :   2 (+  0,=  1,-  1), 25.0 %
Predator X5                   :   2 (+  0,=  0,-  2),  0.0 %
Svart 1.0.0                   :   1 (+  1,=  0,-  0), 100.0 %
Alexandria 3.5                :   8 (+  0,=  7,-  1), 43.8 %
Renegade 0.8.1                :   4 (+  4,=  0,-  0), 100.0 %
Velvet 5.1.0                  :  10 (+  3,=  4,-  3), 50.0 %
Fat Fritz 2                   :   4 (+  0,=  1,-  3), 12.5 %
4ku 2.0                       :   2 (+  2,=  0,-  0), 100.0 %
Camel 0.3.1 GS                :   4 (+  4,=  0,-  0), 100.0 %
Zagreus 2.1.0                 :   2 (+  2,=  0,-  0), 100.0 %
RukChess 3.0.15               :   2 (+  2,=  0,-  0), 100.0 %
Patzer AI 020223              :   2 (+  0,=  0,-  2),  0.0 %
Berserk 11                    :   8 (+  0,=  3,-  5), 18.8 %
Flounder 0.3.0.0              :   6 (+  6,=  0,-  0), 100.0 %
Booot 6.1                     :   6 (+  5,=  1,-  0), 91.7 %
Clover 3.3.1                  :  12 (+  2,=  7,-  3), 45.8 %
Bagatur 3.7a                  :   4 (+  4,=  0,-  0), 100.0 %
Rebel 16.2                    :   8 (+  1,=  5,-  2), 43.8 %
Stockfish 20230218            :   6 (+  0,=  1,-  5),  8.3 %
Cfish 190223                  :   2 (+  0,=  0,-  2),  0.0 %
CorChess 20230219             :   2 (+  0,=  2,-  0), 50.0 %
SimpleChess 1.3               :   2 (+  2,=  0,-  0), 100.0 %
RapShortCs 2023-02-21         :   2 (+  2,=  0,-  0), 100.0 %
Berserk 11.1                  :   2 (+  0,=  2,-  0), 50.0 %
Koivisto 9.2                  :   4 (+  0,=  3,-  1), 37.5 %
Charisma Blitz                :   2 (+  0,=  1,-  1), 25.0 %
Ethereal 14.00 NNUE           :   4 (+  0,=  3,-  1), 37.5 %



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