New package: libcuml (#19471)

* [libcuml] created template

* [libcuml] set cmake list dir

* [libcuml] added some dependencies

* [libcuml] adding some default cmake args

* [libcuml] depends on nccl

* [libcuml] temporarily disabling cuml prims building

* [libcuml] building internal faiss?

* [libcuml] added dependency treelite

* [libcuml] depends on google_test

* [libcuml] forcing single gpu per: https://github.com/rapidsai/cuml/issues/2528#issuecomment-657675957

* [libcuml] added prims?

* [libcuml] adding libcumlcomms ?

* Revert "[libcuml] adding libcumlcomms ?"

This reverts commit 0e0765b7d4d27bdc01d54d24e8c2f9eac1cb4eb2.

* Revert "[libcuml] added prims?"

This reverts commit d0b1f868ea5e425cc7d1a5ce7adc642258dfc38e.

* [libcuml] added varient single gpu

* [libcuml] removed variant singlegpu

* [libcuml] added homepage and description. removed fixmes

* [libcuml] flake8

* [libcuml] cleaning up leftover commented out code

* [libcuml] updated checksum added ucx dependency

var/spack/repos/builtin/packages/libcuml/package.py

@@ -0,0 +1,45 @@
+# Copyright 2013-2020 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 Libcuml(CMakePackage):
+    """cuML is a suite of libraries that implement machine
+    learning algorithms and mathematical primitives functions
+    that share compatible APIs with other RAPIDS projects."""
+
+    homepage = "https://rapids.ai"
+    url      = "https://github.com/rapidsai/cuml/archive/v0.15.0.tar.gz"
+
+    version('0.15.0',  sha256='5c9c656ae4eaa94a426e07d7385fd5ea0e5dc7abff806af2941aee10d4ca99c7')
+
+    depends_on('cmake@3.14:', type='build')
+    depends_on('zlib')
+    depends_on('libcudf@0.8:')
+    depends_on('cuda@9.2:')
+    depends_on('blas')
+    depends_on('nccl@2.4:')
+    depends_on('treelite')
+    depends_on('googletest')
+    depends_on('libcumlprims')
+    depends_on('mpi')
+    depends_on('ucx')
+
+    root_cmakelists_dir = 'cpp'
+
+    def cmake_args(self):
+        args = []
+
+        args.append("-DNCCL_PATH={0}".format(self.spec['nccl'].prefix))
+        args.append("-DBUILD_CUML_C_LIBRARY=ON")
+        args.append("-DWITH_UCX=ON")
+        args.append("-DNVTX=OFF")
+        args.append("-DBUILD_STATIC_FAISS=ON")
+        args.append("-DSINGLEGPU=OFF")
+        args.append("-DENABLE_CUMLPRIMS_MG=ON")
+        args.append("-DBUILD_CUML_MPI_COMMS=ON")
+
+        return args