Subject: [bug#63088] [PATCH] Add Lc0.

From: Liliana Marie Prikler <[email-masked]>
Date: Fri, 28 Jul 2023 06:23:53 +0200

Am Donnerstag, dem 27.07.2023 um 20:34 -0300 schrieb zamfofex:
> Note that, unlike Stockfish, Lc0 does run without the neural
> networks, so it would be necessary for the user to download or
> otherwise acquire one by themself in order to use Lc0.
This sentence looks semantically incorrect.

> The user can choose an appropriate network in their chess GUI program
> when configuring Lc0 in it.
> 
> If this is more desireable, I can submit a patch without the trained
> neural network, which would allow the user to choose whichever one
> they might want.
Providing a default, if it can be bootstrapped, but allowing the user
to choose would be the best option.

> Thanks in advance!
> 
> * gnu/packages/games.scm (lc0): New variable.
> ---
>  gnu/packages/games.scm | 58
> ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 58 insertions(+)
> 
> diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
> index cc6bef1114..21aa370701 100644
> --- a/gnu/packages/games.scm
> +++ b/gnu/packages/games.scm
> @@ -118,6 +118,7 @@ (define-module (gnu packages games)
>    #:use-module (gnu packages bash)
>    #:use-module (gnu packages bison)
>    #:use-module (gnu packages boost)
> +  #:use-module (gnu packages c)
>    #:use-module (gnu packages check)
>    #:use-module (gnu packages cmake)
>    #:use-module (gnu packages compression)
> @@ -171,6 +172,7 @@ (define-module (gnu packages games)
>    #:use-module (gnu packages linux)
>    #:use-module (gnu packages llvm)
>    #:use-module (gnu packages lua)
> +  #:use-module (gnu packages machine-learning)
>    #:use-module (gnu packages man)
>    #:use-module (gnu packages maths)
>    #:use-module (gnu packages messaging)
> @@ -10285,6 +10287,62 @@ (define-public stockfish
>        (home-page "https://stockfishchess.org/")
>        (license license:gpl3+))))
>  
> +(define lc0-neural-network
> +  (let ((hash
> +        
> "f404e156ceb2882470fd8c032b8754af0fa0b71168328912eaef14671a256e34"))
> +      (origin
> +        (method url-fetch)
> +        (uri (string-append
> "https://storage.lczero.org/files/networks/"
> +                            hash))
> +        (sha256
> +         (base32
> +          "03b9xl9vkiihdilz5dzcpg6g4inb6n4k5gs911i3gbd8h9sh9ixi"))
> +        (file-name "lc0-neural-network"))))
> +
> +(define-public lc0
> +  (package
> +    (name "lc0")
> +    (version "0.30.0")
> +    (source
> +     (origin
> +       (method git-fetch)
> +       (uri (git-reference
> +             (url "https://github.com/LeelaChessZero/lc0")
> +             (commit (string-append "v" version))
> +             (recursive? #t)))
> +       (file-name (git-file-name name version))
> +       (sha256
> +        (base32
> "1m7k8m8iz4pxv3h9g2j1dkgryi4k9c1bcg3fx5j7ii4ysif63kj3"))))
> +    (build-system meson-build-system)
> +    (native-search-paths
> +       (list (search-path-specification
> +              (variable "XDG_DATA_DIRS")
> +              (files (list "share")))))
> +    (inputs
> +     `(("neural-network" ,lc0-neural-network)
> +       ("eigen" ,eigen)
> +       ("oneapi-dnnl" ,oneapi-dnnl)
> +       ("zlib" ,zlib)))
> +    (native-inputs
> +     (list googletest ispc pkg-config python))
> +    (arguments
> +     '(#:phases (modify-phases %standard-phases
> +                  (add-after 'install 'copy-net
> +                    (lambda* (#:key outputs inputs #:allow-other-
> keys)
> +                      (mkdir-p (string-append (assoc-ref outputs
> "out")
> +                                              "/share/lc0"))
> +                      (copy-file (assoc-ref inputs "neural-network")
> +                                 (string-append (assoc-ref outputs
> "out")
> +                                                "/share/lc0/neural-
> network")))))
> +       #:configure-flags (list "-Ddnnl=true"
> +                               (string-append
> +                                 "-Ddnnl_dir="
> +                                 (assoc-ref %build-inputs "oneapi-
> dnnl")))))
> +    (synopsis "Neural network based chess engine")
I think the postfix "based", which typically requires a dash is not
easily applied here.  Simply write "Chess engine using neural networks"
or something like that.
> +    (description "Lc0 is a chess engine based on neural networks")
Not a full sentence without period
> +    (home-page "https://lczero.org")
> +    (license license:gpl3+)))
> +
>  (define-public barrage
>    (package
>      (name "barrage")
> 
> base-commit: c7e45139faa27b60f2c7d0a4bc140f9793d97d47

Cheers