[bug#30266] Add FANN

[Ben Woodcroft]

Hi Mark,

Thanks for the patch.

+(define-module (gnu packages ai)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix utils)
+  #:use-module (guix download)
+  #:use-module (guix packages)
+  #:use-module (guix build-system cmake)
+  #:use-module (guix git-download)
+  #:use-module (gnu packages))

I think machine-learning.scm would be a good home for this package, so a new file wouldn't be needed.

+
+(define-public libfann
+  (package
+    (name "libfann")
+    (version "d71d54788b")

The last release is 129 commits behind and it has been some time, so I think you are right - we should package from a git commit.

Usually we package from git using this style though (i.e. reason for not using the release, use of 'file-name', and a version that includes the last release followed by '-1.<commit>').

  ;; There are no recent releases so we package from git.
  (let ((commit "da121155a977197cab9fbb15953ca1b40b11eb87"))
    (package
      (name "newick-utils")
      (version (string-append "1.6-1." (string-take commit 8)))
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "https://github.com/tjunier/newick_utils.git")
                      (commit commit)))
                (file-name (string-append name "-" version "-checkout"))
                (sha256
                 (base32
                  "1hkw21rq1mwf7xp0rmbb2gqc0i6p11108m69i7mr7xcjl268pxnb"))))

+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/libfann/fann.git")
+                    (commit version)))
+              (sha256
+               (base32
+                "0ibwpfrjs6q2lijs8slxjgzb2llcl6rk3v2ski4r6215g5jjhg3x"))))
+    (build-system cmake-build-system)
+    (arguments
+     `(#:tests? #f))

I see from the website:

Once you have installed the library you can test it out by going to the examples directory and type make runtest, which will compile the examples and run a few of them to test that everything is working.

Is that possible? Ideally, since there are tests it would be good to run them.

+    (home-page "http://leenissen.dk/fann/wp/")
+    (synopsis "Fast Artificial Neural Network")
+    (description
+     "FANN is a free open source neural network library, which implements
+multilayer artificial neural networks in C with support for both fully
+connected and sparsely connected networks.")
+    (license license:lgpl2.1)))

Otherwise LGTM. Can you send an updated patch please?

Thanks, ben