fixed cudatoolkit version

tools/generate_conda_file.py

@@ -49,7 +49,8 @@ CONDA_BASE = {
 CONDA_GPU = {
     "numba": "numba>=0.38.1",
     "pytorch": "pytorch>=1.0.0",
-    "tensorflow": "tensorflow-gpu==1.12.0",    
+    "tensorflow": "tensorflow-gpu==1.12.0",
+    "cudatoolkit": "cudatoolkit==9",
 }
 
 PIP_BASE = {