GNU logs - #63088, boring messages

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Subject: [bug#63088] [PATCH 0/3] Add Lc0
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This patch series adds Lc0 “Leela Chess Zero” (a chess engine), alongside a few other optional dependencies that help improve its runtime performance.

zamfofex (3):
  gnu: Add ISPC. * gnu/packages/c.scm (ispc): New variable.
  gnu: Add oneDNN. * gnu/packages/machine-learning.scm (oneapi-dnnl):
    New variable.
  gnu: Add Lc0. * gnu/packages/games.scm (lc0): New variable.

 gnu/packages/c.scm                | 63 +++++++++++++++++++++++++++++++
 gnu/packages/games.scm            | 60 ++++++++++++++++++++++++++++-
 gnu/packages/machine-learning.scm | 21 +++++++++++
 3 files changed, 143 insertions(+), 1 deletion(-)


base-commit: 380faf265b0c3b231ab8b69597d161be5e704e18
-- 
2.39.2

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To: zamfofex <zamfofex@HIDDEN>
Subject: bug#63088: Acknowledgement ([PATCH 0/3] Add Lc0)
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Subject: [bug#63088] [PATCH 1/3] gnu: Add ISPC. * gnu/packages/c.scm (ispc): New variable.
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Date: Wed, 26 Apr 2023 10:17:37 -0300
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---
 gnu/packages/c.scm | 63 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/gnu/packages/c.scm b/gnu/packages/c.scm
index b2f16613dd..28438f56c8 100644
--- a/gnu/packages/c.scm
+++ b/gnu/packages/c.scm
@@ -17,6 +17,7 @@
 ;;; Copyright © 2022 Artyom V. Poptsov <poptsov.artyom@HIDDEN>
 ;;; Copyright © 2022 Ekaitz Zarraga <ekaitz@HIDDEN>
 ;;; Copyright © 2022 ( <paren@HIDDEN>
+;;; Copyright © 2023 zamfofex <zamfofex@HIDDEN>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -57,7 +58,9 @@ (define-module (gnu packages c)
   #:use-module (gnu packages guile)
   #:use-module (gnu packages llvm)
   #:use-module (gnu packages lua)
+  #:use-module (gnu packages m4)
   #:use-module (gnu packages multiprecision)
+  #:use-module (gnu packages ncurses)
   #:use-module (gnu packages pcre)
   #:use-module (gnu packages python)
   #:use-module (gnu packages python-xyz)
@@ -1375,3 +1378,63 @@ (define-public utest-h
       (description
        "This package provides a header-only unit testing library for C/C++.")
       (license license:unlicense))))
+
+(define-public ispc
+  (package
+    (name "ispc")
+    (version "1.19.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/ispc/ispc")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "0yhcgyzjlrgs920lm0l6kygj2skanfb6qkxbdgm69r8c2xkzkaa3"))))
+    (inputs (list ncurses))
+    (native-inputs (list bison clang flex m4 python))
+    (build-system cmake-build-system)
+    (supported-systems '("x86_64-linux" "i686-linux" "aarch64-linux" "armhf-linux"))
+    (arguments `(#:tests? #f
+                 #:configure-flags
+                   `(,,(string-append "-DCMAKE_C_COMPILER=" (cc-for-target))
+                     ,,(string-append "-DCMAKE_CXX_COMPILER=" (cxx-for-target))
+                     ,(string-append "-DCLANG_EXECUTABLE="
+                                     (assoc-ref %build-inputs "clang")
+                                     "/bin/clang")
+                     ,(string-append "-DCLANGPP_EXECUTABLE="
+                                     (assoc-ref %build-inputs "clang")
+                                     "/bin/clang++"))
+                 #:phases
+                   (modify-phases %standard-phases
+                     (add-before 'configure 'patch-curses-requirement
+                       (lambda _
+                         (substitute* "CMakeLists.txt"
+                                      (("\\bCURSES_CURSES_LIBRARY\\b")
+                                        "CURSES_LIBRARY"))))
+                     ; Note: This works around the following issue:
+                     ; <https://github.com/ispc/ispc/issues/1865>
+                     ; Because GCC in Guix does not have multilib support.
+                     (add-before 'configure 'patch-target-archs
+                       (lambda _
+                         (substitute* "cmake/GenerateBuiltins.cmake"
+                                      (("\\bforeach \\(bit 32 64\\)")
+                                        ,(if (target-64bit?)
+                                             "foreach (bit 64)"
+                                             "foreach (bit 32)"))
+                                      (("\\bforeach \\(arch .*?\\)")
+                                        ,(if (target-x86?)
+                                             "foreach (arch \"x86\")"
+                                             "foreach (arch \"arm\")"))
+                                      (("\\bforeach \\(os_name \"windows\" .*?\\)")
+                                        "foreach (os_name \"linux\")")))))))
+    (synopsis "Implicit SPMD Program Compiler")
+    (description
+     "ISPC is a compiler for a variant of the C programming language, with
+extensions for single program, multiple data programming.  Under the SPMD
+model, the programmer writes a program that generally appears to be a regular
+serial program, though the execution model is actually that a number of program
+instances execute in parallel on the hardware.")
+    (home-page "https://github.com/ispc/ispc")
+    (license license:bsd-3)))
-- 
2.39.2

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Subject: [bug#63088] [PATCH 2/3] gnu: Add oneDNN. * gnu/packages/machine-learning.scm (oneapi-dnnl): New variable.
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---
 gnu/packages/machine-learning.scm | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/gnu/packages/machine-learning.scm b/gnu/packages/machine-learning.scm
index 37d4ef78ad..a29bb312e6 100644
--- a/gnu/packages/machine-learning.scm
+++ b/gnu/packages/machine-learning.scm
@@ -17,6 +17,7 @@
 ;;; Copyright © 2020 Edouard Klein <edk@HIDDEN>
 ;;; Copyright © 2020, 2021, 2022, 2023 Vinicius Monego <monego@HIDDEN>
 ;;; Copyright © 2020, 2021, 2022, 2023 Maxim Cournoyer <maxim.cournoyer@HIDDEN>
+;;; Copyright © 2023 zamfofex <zamfofex@HIDDEN>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -3868,3 +3869,23 @@ (define-public python-brian2tools
 Brian 2 simulator.")
     (license license:cecill)))

+(define-public oneapi-dnnl
+  (package
+    (name "oneapi-dnnl")
+    (version "3.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/oneapi-src/oneDNN")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "1jgmb5kl0bf4a2zfn94zlb117672r9lvvkkmwl86ihlyr1mpr3d0"))))
+    (build-system cmake-build-system)
+    (home-page "https://github.com/oneapi-src/oneDNN")
+    (synopsis "Deep Neural Network Library")
+    (description
+     "OneAPI Deep Neural Network Library (oneDNN) is a cross-platform
+performance library of basic building blocks for deep learning applications.")
+    (license license:asl2.0)))
-- 
2.39.2

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---
 gnu/packages/games.scm | 60 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 59 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index 23b6c39c46..9350c9224c 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -70,7 +70,7 @@
 ;;; Copyright © 2021 Foo Chuan Wei <chuanwei.foo@HIDDEN>
 ;;; Copyright © 2022, 2023 Yovan Naumovski <yovan@HIDDEN>
 ;;; Copyright © 2022 Roman Riabenko <roman@HIDDEN>
-;;; Copyright © 2022 zamfofex <zamfofex@HIDDEN>
+;;; Copyright © 2022, 2023 zamfofex <zamfofex@HIDDEN>
 ;;; Copyright © 2022 Gabriel Arazas <foo.dogsquared@HIDDEN>
 ;;; Copyright © 2022 Maxim Cournoyer <maxim.cournoyer@HIDDEN>
 ;;; Copyright © 2022 Hendursaga <hendursaga@HIDDEN>
@@ -114,6 +114,7 @@ (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)
@@ -166,6 +167,7 @@ (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)
@@ -10395,6 +10397,62 @@ (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 "0.29.0")
+    (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 "1yn91738wd8zlbvrcw0dszy7hqjpkml0wi5xhh36j4zgid6x8i2m"))))
+    (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")
+    (description "Lc0 is a chess engine based on neural networks")
+    (home-page "https://lczero.org")
+    (license license:gpl3+)))
+
 (define-public barrage
   (package
     (name "barrage")
-- 
2.39.2

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Hello, I have pushed ispc and oneapi-dnnl, thank you!


zamfofex <zamfofex@HIDDEN> writes:
> +(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"))))

Will we able to train a model from source?  And how much will it cost?

As far as I know, guix haven't decided to accept pre-trained models:

https://yhetil.org/guix/xanfHBZT3lYlyrr_OqHHMWkunLeZZlcxzY37_T3TeZo7mfJClD5-OTbkXDH2f3lMTkn94YIFVUj-Z31BP2Wj0W2rISNP6glC2PzXcPdb560=@protonmail.com/

Message sent to guix-patches@HIDDEN:

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> Will we able to train a model from source?  And how much will it cost?
>=20
> As far as I know, guix haven't decided to accept pre-trained models:
>=20
> https://yhetil.org/guix/xanfHBZT3lYlyrr_OqHHMWkunLeZZlcxzY37_T3TeZo7mfJCl=
D5-OTbkXDH2f3lMTkn94YIFVUj-Z31BP2Wj0W2rISNP6glC2PzXcPdb560=3D@HIDDEN=
m/

I don=E2=80=99t think it is feasible. Lc0=E2=80=99s approach is based on se=
lf=E2=80=90play reinforcement=E2=80=90learning, which in effect means that =
training starts with no knowledge about chess except for its rules (playing=
 seemingly random moves), and going from there to learn increasingly more a=
bout it. So, in practice, this means it would take multiple months or at le=
ast several weeks to attain a neural network model that is anywhere close t=
o as effective as the ones provided and pre=E2=80=90trained. Besides, I bel=
ieve training requires a (reasonably decent) GPU.

But the network isn=E2=80=99t prohibitively large and its license is not pr=
oprietary. I=E2=80=99ll also note that Stockfish (packaged immediately abov=
e my Lc0 package) *does* itself include a provided pre=E2=80=90trained netw=
ork and no=E2=80=90one has really complained about it, so I think it should=
 be fine here too.

Message sent to guix-patches@HIDDEN:

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Hi,

On Thu, 11 May 2023 at 18:25, zamfofex <zamfofex@HIDDEN> wrote:
>> Will we able to train a model from source?  And how much will it cost?
>>=20
>> As far as I know, guix haven't decided to accept pre-trained models:
>>=20
>> https://yhetil.org/guix/xanfHBZT3lYlyrr_OqHHMWkunLeZZlcxzY37_T3TeZo7mfJC=
lD5-OTbkXDH2f3lMTkn94YIFVUj-Z31BP2Wj0W2rISNP6glC2PzXcPdb560=3D@HIDDEN=
om/
>
> I don=E2=80=99t think it is feasible. Lc0=E2=80=99s approach is based on =
self=E2=80=90play
> reinforcement=E2=80=90learning, which in effect means that training starts
> with no knowledge about chess except for its rules (playing seemingly
> random moves), and going from there to learn increasingly more about
> it. So, in practice, this means it would take multiple months or at
> least several weeks to attain a neural network model that is anywhere
> close to as effective as the ones provided and pre=E2=80=90trained. Besid=
es, I
> believe training requires a (reasonably decent) GPU.

I concur.


> But the network isn=E2=80=99t prohibitively large and its license is not
> proprietary. I=E2=80=99ll also note that Stockfish (packaged immediately =
above
> my Lc0 package) *does* itself include a provided pre=E2=80=90trained netw=
ork
> and no=E2=80=90one has really complained about it, so I think it should be
> fine here too.

I will try to dedicate some time for reviewing this patch set.


Cheers,
simon

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From: zamfofex <zamfofex@HIDDEN>
Date: Thu, 27 Jul 2023 20:34:05 -0300
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Lc0 recently released version 0.30.0, so here is a patch with the updates version (in case the issue regarding the network’s inclusion is ever resolved).

Also, I wanted to say: Is it reasonable to include Lc0 without the networks in? People can still download and use them, they just wouldn’t be included in Guix itself.

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. 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.

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")
+    (description "Lc0 is a chess engine based on neural networks")
+    (home-page "https://lczero.org")
+    (license license:gpl3+)))
+
 (define-public barrage
   (package
     (name "barrage")

base-commit: c7e45139faa27b60f2c7d0a4bc140f9793d97d47
-- 
2.40.1

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> Note that, unlike Stockfish, Lc0 does run without the neural networks

Sorry, I meant to say =E2=80=9CLc0 does *not* run without the neural networ=
ks=E2=80=9D. (=E2=80=9CNot=E2=80=9D is a fairly important word to have forg=
otten!)

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Message sent to guix-patches@HIDDEN:

X-Loop: help-debbugs@HIDDEN
Subject: [bug#63088] [PATCH] Add Lc0.
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X-GNU-PR-Message: followup 63088
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To: Liliana Marie Prikler <liliana.prikler@HIDDEN>, 63088 <at> debbugs.gnu.org
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Date: Fri, 28 Jul 2023 15:14:24 -0300 (BRT)
From: zamfofex <zamfofex@HIDDEN>
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> This sentence looks semantically incorrect.

Yes, sorry! I guess you didn=E2=80=99t receive my correction email. (I=E2=
=80=99m still bad at sending emails properly, it seems.) See: <https://issu=
es.guix.gnu.org/63088#8> I had meant =E2=80=9CLc0 does *not* run without th=
e neural networks=E2=80=9D.

> Providing a default, if it can be bootstrapped, but allowing the user to =
choose would be the best option.

I don=E2=80=99t think a default can be easily bootstrapped. When I first su=
bmitted the patch, I talked with some of the Lc0 developers, and they said =
it might be possible to bootstrap one by using Stockfish in several minutes=
, but there is no code that does that currrently (it would have to be writt=
en and is nontrivial). And it wouldn=E2=80=99t be as effective as the exist=
ing networks, because Stockfish=E2=80=99s evaluation provides less informat=
ion than Lc0=E2=80=99s is able to use.

In any case, that feels entirely redundant, because Stockfish=E2=80=99s NNU=
E networks were trained on Lc0=E2=80=99s anyway, so it seems to be only add=
ing a layer of complexity for no seemingly good reason.

If this concern can be addressed somehow, I can submit a followup patch. (E=
ither just fixing the wording, or also removing the networks.)

Message sent to liliana.prikler@HIDDEN, iyzsong@HIDDEN, guix-patches@HIDDEN:

X-Loop: help-debbugs@HIDDEN
Subject: [bug#63088] [PATCH v2] gnu: Add Lc0.
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Cc: zamfofex <zamfofex@HIDDEN>, =?UTF-8?Q?=E5=AE=8B=E6=96=87=E6=AD=A6?= <iyzsong@HIDDEN>, Liliana Marie Prikler <liliana.prikler@HIDDEN>, =?UTF-8?Q?=E5=AE=8B=E6=96=87=E6=AD=A6?= <iyzsong@HIDDEN>
X-Debbugs-Original-Xcc: Liliana Marie Prikler <liliana.prikler@HIDDEN>, =?UTF-8?Q?=E5=AE=8B=E6=96=87=E6=AD=A6?= <iyzsong@HIDDEN>
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From: zamfofex <zamfofex@HIDDEN>

* gnu/packages/games.scm (lc0): New variable.

Signed-off-by: 宋文武 <iyzsong@HIDDEN>
---
 gnu/packages/games.scm | 59 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index 760234b031..f82f1dcc52 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)
@@ -10409,6 +10411,63 @@ (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 '("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 "Chess engine using neural networks")
+    (description "Lc0 is a UCI-compliant chess engine designed to play chess
+via neural network, specifically those of the LeelaChessZero project.")
+    (home-page "https://lczero.org")
+    (license license:gpl3+)))
+
 (define-public barrage
   (package
     (name "barrage")

base-commit: 5ef28595e9dff8b88ec3fcb4d887fbc380c9a8b8
prerequisite-patch-id: 8cee4be3d25dba0dde5c2d0e317f31741c010f50
-- 
2.41.0

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Subject: [bug#63088] [PATCH v2] gnu: Add Lc0.
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> recursive? #t is meh ._.
> Can we work around that?

Yes, presumably easily, but I don=E2=80=99t think it would be a good idea i=
n this case, because it isn=E2=80=99t used to build bundled software, but r=
ather just for a small project=E2=80=90specific pair of source files (that =
are in a separate repo just because they are used by other repos of the pro=
ject too).

> Can we use search-input-file or the like here?

Probably. Though would it be reasonable to package the network separately i=
nstead? Note that Lc0 is able to load various networks, and there is no can=
onical network, so maybe it would be useful to have it in a different packa=
ge so that more can be potentially added in the future.

Then people could use them with something like =E2=80=98guix shell lc0 lc0-=
NETWORK_NAME=E2=80=99.

> Is Lc0 =3D Leela Chess Zero?  What's the connection?

=E2=80=9CLc0=E2=80=9D, =E2=80=9CLeela Chess Zero=E2=80=9D, =E2=80=9CLCZero=
=E2=80=9D, and sometimes just =E2=80=9CLeela Chess=E2=80=9D can be used rou=
ghly interchangeably to refer to the project as a whole. Though, occasional=
ly, people will use the term =E2=80=9CLc0=E2=80=9D (sometimes capitalised a=
s =E2=80=9Clc0=E2=80=9D) to refer specifically to the =E2=80=98lc0=E2=80=99=
 executable, which can use the networks from the Leela Chess Zero project, =
but networks created by other people too, including those of e.g. the Maia =
project, see <https://github.com/CSSLab/maia-chess> and <https://maiachess.=
com>

At some point (very early on), the code for the executable was rewritten or=
 otherwise largely refactored, and at the same time renamed from =E2=80=98l=
czero=E2=80=99 to the current =E2=80=98lc0=E2=80=99, so sometimes (very rar=
ely nowadays), people will use the term =E2=80=9Clc0=E2=80=9D (or =E2=80=9C=
Lc0=E2=80=9D) to refer specifically to this new executable and code base, c=
ontrasting with the former =E2=80=98lczero=E2=80=99 executable and its code=
 base.

Honestly, this all feels convoluted to me, so I usually like to use the ter=
ms interchangeably, and I don=E2=80=99t think using them differently in the=
 package description is a good choice.

- - - - -

Hopefully this helps clarify things well enough! If there is interest, I ca=
n submit another patch with the requested changes and the appropriate path =
taken regarding the packaging for the networks.

Message sent to guix-patches@HIDDEN:

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Am Montag, dem 11.09.2023 um 07:22 -0300 schrieb zamfofex:
> > recursive? #t is meh ._.
> > Can we work around that?
>=20
> Yes, presumably easily, but I don=E2=80=99t think it would be a good idea=
 in
> this case, because it isn=E2=80=99t used to build bundled software, but
> rather just for a small project=E2=80=90specific pair of source files (th=
at
> are in a separate repo just because they are used by other repos of
> the project too).
In that case, a comment explaining this in 1-2 lines would probably be
fine.

> > Can we use search-input-file or the like here?
>=20
> Probably. Though would it be reasonable to package the network
> separately instead? Note that Lc0 is able to load various networks,
> and there is no canonical network, so maybe it would be useful to
> have it in a different package so that more can be potentially added
> in the future.
>=20
> Then people could use them with something like =E2=80=98guix shell lc0 lc=
0-
> NETWORK_NAME=E2=80=99.
Sounds reasonable to me.  Do add a phrase or two about this to the lc0
description though if it doesn't even ship a basic network.

>=20
> > Is Lc0 =3D Leela Chess Zero?=C2=A0 What's the connection?
>=20
> =E2=80=9CLc0=E2=80=9D, =E2=80=9CLeela Chess Zero=E2=80=9D, =E2=80=9CLCZer=
o=E2=80=9D, and sometimes just =E2=80=9CLeela Chess=E2=80=9D
> can be used roughly interchangeably to refer to the project as a
> whole. Though, occasionally, people will use the term =E2=80=9CLc0=E2=80=
=9D
> (sometimes capitalised as =E2=80=9Clc0=E2=80=9D) to refer specifically to=
 the =E2=80=98lc0=E2=80=99
> executable, which can use the networks from the Leela Chess Zero
> project, but networks created by other people too, including those of
> e.g. the Maia project, see <https://github.com/CSSLab/maia-chess> and
> <https://maiachess.com>
>=20
> At some point (very early on), the code for the executable was
> rewritten or otherwise largely refactored, and at the same time
> renamed from =E2=80=98lczero=E2=80=99 to the current =E2=80=98lc0=E2=80=
=99, so sometimes (very rarely
> nowadays), people will use the term =E2=80=9Clc0=E2=80=9D (or =E2=80=9CLc=
0=E2=80=9D) to refer
> specifically to this new executable and code base, contrasting with
> the former =E2=80=98lczero=E2=80=99 executable and its code base.
>=20
> Honestly, this all feels convoluted to me, so I usually like to use
> the terms interchangeably, and I don=E2=80=99t think using them different=
ly
> in the package description is a good choice.
In that case, for the description we should probably go with "Leela
Chess Zero" or "@acronym{lc0, Leela Chess Zero}"

Cheers

Last modified: Mon, 11 Sep 2023 18:15:01 UTC

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