Update switch_cuda.sh

switch_cuda.sh

@@ -28,14 +28,8 @@
 set -e
 
 
-# ensure that the script has been sourced rather than just executed
-if [[ "${BASH_SOURCE[0]}" = "${0}" ]]; then
-    echo "Please use 'source' to execute switch-cuda.sh!"
-    exit 1
-fi
-
 INSTALL_FOLDER="/usr/local"  # the location to look for CUDA installations at
-TARGET_VERSION=${1}          # the target CUDA version to switch to (if provided)
+TARGET_VERSION=12.3        # the target CUDA version to switch to (if provided)
 
 # if no version to switch to has been provided, then just print all available CUDA installations
 if [[ -z ${TARGET_VERSION} ]]; then