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+(define-module (px packages machine-learning)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix packages)
+  #:use-module (guix utils)
+  #:use-module (guix download)
+  #:use-module (guix svn-download)
+  #:use-module (guix build-system cmake)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix build-system ocaml)
+  #:use-module (guix build-system python)
+  #:use-module (guix build-system r)
+  #:use-module (guix git-download)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages adns)
+  #:use-module (gnu packages algebra)
+  #:use-module (gnu packages audio)
+  #:use-module (gnu packages autotools)
+  #:use-module (gnu packages base)
+  #:use-module (gnu packages bash)
+  #:use-module (gnu packages boost)
+  #:use-module (gnu packages check)
+  #:use-module (gnu packages compression)
+  #:use-module (gnu packages cran)
+  #:use-module (gnu packages databases)
+  #:use-module (gnu packages dejagnu)
+  #:use-module (gnu packages gcc)
+  #:use-module (gnu packages glib)
+  #:use-module (gnu packages graphviz)
+  #:use-module (gnu packages gstreamer)
+  #:use-module (gnu packages image)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages maths)
+  #:use-module (gnu packages mpi)
+  #:use-module (gnu packages ocaml)
+  #:use-module (gnu packages onc-rpc)
+  #:use-module (gnu packages perl)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages protobuf)
+  #:use-module (gnu packages python)
+  #:use-module (gnu packages python-science)
+  #:use-module (gnu packages python-web)
+  #:use-module (gnu packages python-xyz)
+  #:use-module (gnu packages rpc)
+  #:use-module (gnu packages serialization)
+  #:use-module (gnu packages sphinx)
+  #:use-module (gnu packages statistics)
+  #:use-module (gnu packages sqlite)
+  #:use-module (gnu packages swig)
+  #:use-module (gnu packages web)
+  #:use-module (gnu packages xml)
+  #:use-module (gnu packages xorg)
+  #:use-module (ice-9 match))
+
+(define-public dlib
+  (package
+    (name "dlib")
+    (version "19.21")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "http://dlib.net/files/dlib-" version ".tar.bz2"))
+              (sha256
+               (base32
+                "0g7mgm6l6nw9hlw2zckf59jcd2y2lf907n88hjschkccmq1qlwmy"))
+              (modules '((guix build utils)))
+              (snippet
+               '(begin
+                  ;; Delete ~13MB of bundled dependencies.
+                  (delete-file-recursively "dlib/external")
+                  (delete-file-recursively "docs/dlib/external")
+                  #t))))
+    (build-system cmake-build-system)
+    (arguments
+     `(#:configure-flags '("-DBUILD_SHARED_LIBS=ON")
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'disable-asserts
+           (lambda _
+             ;; config.h recommends explicitly enabling or disabling asserts
+             ;; when building as a shared library. By default neither is set.
+             (substitute* "dlib/config.h"
+               (("^//#define DLIB_DISABLE_ASSERTS") "#define DLIB_DISABLE_ASSERTS"))
+             #t))
+         (add-after 'disable-asserts 'disable-failing-tests
+           (lambda _
+             ;; One test times out on MIPS, so we need to disable it.
+             ;; Others are flaky on some platforms.
+             (let* ((system ,(or (%current-target-system)
+                                 (%current-system)))
+                    (disabled-tests (cond
+                                     ((string-prefix? "mips64" system)
+                                      '("object_detector" ; timeout
+                                        "data_io"))
+                                     ((string-prefix? "armhf" system)
+                                      '("learning_to_track"))
+                                     ((string-prefix? "i686" system)
+                                      '("optimization"))
+                                     (else '()))))
+               (for-each
+                (lambda (test)
+                  (substitute* "dlib/test/makefile"
+                    (((string-append "SRC \\+= " test "\\.cpp")) "")))
+                disabled-tests)
+               #t)))
+         (replace 'check
+           (lambda _
+             ;; No test target, so we build and run the unit tests here.
+             (let ((test-dir (string-append "../dlib-" ,version "/dlib/test")))
+               (with-directory-excursion test-dir
+                 (invoke "make" "-j" (number->string (parallel-job-count)))
+                 (invoke "./dtest" "--runall"))
+               #t))))))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)
+       ;; For tests.
+       ("libnsl" ,libnsl)))
+    (inputs
+     `(("giflib" ,giflib)
+       ("lapack" ,lapack)
+       ("libjpeg" ,libjpeg-turbo)
+       ("libpng" ,libpng)
+       ("libx11" ,libx11)
+       ("openblas" ,openblas)
+       ("zlib" ,zlib)))
+    (synopsis
+     "Toolkit for making machine learning and data analysis applications in C++")
+    (description
+     "Dlib is a modern C++ toolkit containing machine learning algorithms and
+tools.  It is used in both industry and academia in a wide range of domains
+including robotics, embedded devices, mobile phones, and large high performance
+computing environments.")
+    (home-page "http://dlib.net")
+    (license license:boost1.0)))