new package: py-scikit-learn-extra (#27439)

* new package: py-scikit-learn-extra

* Remove extra blank line

* Add missing py-cython dependency

var/spack/repos/builtin/packages/py-scikit-learn-extra/package.py

@@ -0,0 +1,27 @@
+# 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 PyScikitLearnExtra(PythonPackage):
+    """A set of useful tools compatible with scikit-learn
+
+    scikit-learn-extra is a Python module for machine learning that extends
+    scikit-learn. It includes algorithms that are useful but do not satisfy the
+    scikit-learn inclusion criteria, for instance due to their novelty or lower
+    citation number."""
+
+    homepage = "https://github.com/scikit-learn-contrib/scikit-learn-extra"
+    pypi     = "scikit-learn-extra/scikit-learn-extra-0.2.0.tar.gz"
+
+    version('0.2.0', sha256='3b1bb5fedde47920eb4b3fa0a0c18f80cc7359d9d0496720178788c6153b8019')
+
+    depends_on('python@3.6:', type=('build', 'run'))
+    depends_on('py-setuptools', type='build')
+    depends_on('py-cython@0.28.5:', type='build')
+    depends_on('py-numpy@1.13.3:', type=('build', 'run'))
+    depends_on('py-scipy@0.19.1:', type=('build', 'run'))
+    depends_on('py-scikit-learn@0.23:', type=('build', 'run'))