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** Minimizing the [https://en.wikipedia.org/wiki/Cross_entropy cross entropy] loss of a [[Automated Tuning#LogisticRegression|Logistic Regression]] model for each phase
** Training converges fast due to [https://en.wikipedia.org/wiki/Linear_model linear model] at the heart
* As of '''Winter 0.6.2''', the evaluation function relies on a [[Neural Networks|neural network]] with two main parts. The first part is a non-standard [[Neural Networks#Convolutional|convolutional neural network]] which uses sparsity similarly to [[NNUE]]. This convolutional network is used to calculate [[Pawn Structure|pawn structure]] features, so the output can be reused very often as it gets stored in a separate [[Pawn Hash Table|hash table]] with a high hitrate. The second part is a fully connected network which has as input the output of the convolutional network as well as a set of handcrafted features standard to classical engines, mostly a subset of the features from before neural networks were added to Winter <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74531&start=5 Re: NNUE accessible explanation] by [[Jonathan Rosenthal]], [[CCC]], July 24, 2020</ref>
==Misc==
* [[Perft]]
=Forum Posts=
==2017 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=65466&start=4 Re: Tapered Eval between 4 phases] by [[Jonathan Rosenthal]], [[CCC]], October 16, 2017 » [[Tapered Eval]]
* [http://www.talkchess.com/forum/viewtopic.php?t=66266 Winter Released] by [[Jonathan Rosenthal]], [[CCC]], January 08, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68266 Winter 0.2 Release Overview and Select Games] by [[Jonathan Rosenthal]], [[CCC]], August 20, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=69288 Winter 0.3 Release Overview and Select Games] by [[Jonathan Rosenthal]], [[CCC]], December 16, 2018 » [[TCEC Season 14]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72284 Winter NN Training Script] by [[Jonathan Rosenthal]], [[CCC]], November 09, 2019
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74531&start=5 Re: NNUE accessible explanation] by [[Jonathan Rosenthal]], [[CCC]], July 24, 2020 » [[NNUE]]
=External Links=
[[Category:Open Source]]
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[[Category:NN]]
[[Category:Johnny Winter]]
[[Category:Tommy Shannon]]
