From 112c2c010b2e84691302bdc174d9a4825dc6ca24 Mon Sep 17 00:00:00 2001
From: Fis Trivial <ybbs.daans@hotmail.com>
Date: Tue, 12 Jun 2018 10:01:16 +0000
Subject: [PATCH] gnu: Add lightgbm.
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* gnu/packages/machine-learning.scm (lightgbm): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
---
 gnu/packages/machine-learning.scm | 47 +++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/gnu/packages/machine-learning.scm b/gnu/packages/machine-learning.scm
index 15e4d45749..cda5c1e2c8 100644
--- a/gnu/packages/machine-learning.scm
+++ b/gnu/packages/machine-learning.scm
@@ -47,6 +47,7 @@ (define-module (gnu packages machine-learning)
   #:use-module (gnu packages gcc)
   #:use-module (gnu packages image)
   #:use-module (gnu packages maths)
+  #:use-module (gnu packages mpi)
   #:use-module (gnu packages ocaml)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages pkg-config)
@@ -786,3 +787,49 @@ (define-public python-autograd
 
 (define-public python2-autograd
   (package-with-python2 python-autograd))
+
+(define-public lightgbm
+  (package
+    (name "lightgbm")
+    (version "2.0.12")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://github.com/Microsoft/LightGBM/archive/v"
+                    version ".tar.gz"))
+              (sha256
+               (base32
+                "132zf0yk0545mg72hyzxm102g3hpb6ixx9hnf8zd2k55gas6cjj1"))
+              (file-name (string-append name "-" version ".tar.gz"))))
+    (native-inputs
+     `(("python-pytest" ,python-pytest)
+       ("python-nose" ,python-nose)))
+    (inputs
+     `(("openmpi" ,openmpi)))
+    (propagated-inputs
+     `(("python-numpy" ,python-numpy)
+       ("python-scipy" ,python-scipy)))
+    (arguments
+     `(#:configure-flags
+       '("-DUSE_MPI=ON")
+       #:phases
+       (modify-phases %standard-phases
+         (replace 'check
+           (lambda* (#:key outputs #:allow-other-keys)
+             (with-directory-excursion ,(string-append "../LightGBM-" version)
+               (invoke "pytest" "tests/c_api_test/test_.py")))))))
+    (build-system cmake-build-system)
+    (home-page "https://github.com/Microsoft/LightGBM")
+    (synopsis "Gradient boosting framework based on decision tree algorithms")
+    (description "LightGBM is a gradient boosting framework that uses tree
+based learning algorithms.  It is designed to be distributed and efficient with
+the following advantages:
+
+@itemize
+@item Faster training speed and higher efficiency
+@item Lower memory usage
+@item Better accuracy
+@item Parallel and GPU learning supported (not enabled in this package)
+@item Capable of handling large-scale data
+@end itemize\n")
+    (license license:expat)))