Update app.py

app.py

@@ -20,7 +20,6 @@ from sklearn.ensemble import RandomForestClassifier
 from sklearn.naive_bayes import GaussianNB
 from sklearn.metrics import accuracy_score
 
-
 # Suppress TensorFlow warnings
 os.environ["CUDA_VISIBLE_DEVICES"] = "-1"
 os.environ["TF_CPP_MIN_LOG_LEVEL"] = "3"
@@ -274,17 +273,16 @@ with gr.Blocks() as app:
 
     # Theme changing logic
     theme_dropdown.change(
-        None,
-        None,
-        app,
-        _js=f"""
-        (theme) => {{
-            let themeElem = document.createElement('link');
+        lambda theme: f"""
+        () => {{
+            const themeElem = document.createElement('link');
             themeElem.rel = 'stylesheet';
-            themeElem.href = '/themes/' + theme + '.css';  // Path to the theme CSS files
+            themeElem.href = '/themes/' + theme + '.css'; // Path to the theme CSS files
             document.head.appendChild(themeElem);
         }}
-        """
+        """,
+        inputs=theme_dropdown,
+        outputs=[]
     )
 
     toggle_dark.click(None, _js="""