New package: py-lightgbm (#21649)

* [py-lightgbm] created template

* [py-lightgbm] added homepage and description

* [py-lightgbm] added dependencies

* [py-lightgbm] build requires cmake

* [py-lightgbm] added mpi variant

* [py-lightgbm] removed fixmes

* [py-lightgbm] removed more fixmes

var/spack/repos/builtin/packages/py-lightgbm/package.py

@@ -0,0 +1,36 @@
+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyLightgbm(PythonPackage):
+    """LightGBM is a gradient boosting framework that uses tree
+    based learning algorithms."""
+
+    homepage = "https://github.com/microsoft/LightGBM"
+    pypi     = "lightgbm/lightgbm-3.1.1.tar.gz"
+
+    version('3.1.1', sha256='babece2e3613e97748a67ed45387bb0e984bdb1f4126e39f010fbfe7503c7b20')
+
+    variant('mpi', default=False, description="Build with mpi support")
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-wheel', type=('build', 'run'))
+    depends_on('py-numpy', type=('build', 'run'))
+    depends_on('py-scipy', type=('build', 'run'))
+    depends_on('py-scikit-learn@:0.21.999,0.22.1:', type=('build', 'run'))
+
+    depends_on('cmake@3.8:', type='build')
+
+    depends_on('mpi', when='+mpi')
+
+    def install_args(self, spec, prefix):
+        args = []
+
+        if spec.satisfies('+mpi'):
+            args.append('--mpi')
+
+        return args