fix: multiple bug fixes - remove unused imports, fix typo, fix dataset paths, add ai command fallback

train-on-this-server.sh

@@ -12,8 +12,12 @@ echo ""
 
 # Unload AI model to free VRAM
 echo "=== Unloading AI model ==="
-ai none
-sleep 2
+if command -v ai &> /dev/null; then
+    ai none
+    sleep 2
+else
+    echo "Warning: 'ai' command not found, skipping AI unload"
+fi
 
 # Check Python
 if ! command -v python3 &> /dev/null; then