Drwebb/gpu doc (#386)

* Add mention of blob ref of original file from caffe2

* Mention location of source listing originally from LLVM project

cmake/Modules/FindCUDNN.cmake

@@ -11,6 +11,10 @@
 # See the License for the specific language governing permissions and
 #
 
+# The remaining code in this file was included from the Caffe 2 project,
+# which was made available under the terms of the Apache 2.0 License.
+# [link] (https://github.com/caffe2/caffe2/blob/f69232c9237174f8e272c0fc59d3e28af52842f2/cmake/Modules/FindCuDNN.cmake)
+
 # - Try to find cuDNN
 #
 # The following variables are optionally searched for defaults

test/cudnn.cpp

@@ -40,6 +40,8 @@ TEST(cudnn, loadTest)
 TEST(cudnn, compileTest)
 {
     const auto source = R"###(
+// Example developed from LLVM documentation https://llvm.org/docs/NVPTXUsage.html
+
 #include <cassert>
 #include <fstream>
 #include <iostream>