Fixed bug running inference from cli.

covid/tasks/inference.py

@@ -355,9 +355,7 @@ if __name__ == "__main__":
     parser.add_argument(
         "-o", "--output", type=str, help="Output file", required=True
     )
-    parser.add_argument(
-        "data_file", type=str, help="Data pickle file", required=True
-    )
+    parser.add_argument("data_file", type=str, help="Data NetCDF file")
     args = parser.parse_args()
 
     with open(args.config, "r") as f: