Update app.py

app.py

@@ -51,12 +51,12 @@ def preprocess_dataframe(df):
         if df[column].dtype == 'object':  # Checking for string columns
             df[column] = df[column].apply(remove_invalid_unicode)
     return df
-    
-leaderboard_df = None
-# Apply preprocessing right after fetching the DataFrame and before passing it to create_leaderboard_table
+
+# Fetch and preprocess the leaderboard DataFrame
 llm_perf_df = get_llm_perf_df()
-llm_perf_df = preprocess_dataframe(llm_perf_df)  # Make sure your DataFrame is cleaned up
-print(llm_perf_df)
+llm_perf_df = preprocess_dataframe(llm_perf_df)
+
+# Create the leaderboard table
 leaderboard_table = create_leaderboard_table(llm_perf_df)
 
 def display(x, y):
@@ -65,8 +65,9 @@ def display(x, y):
         return leaderboard_table
     else:
         # Handle the case where leaderboard_table is not a DataFrame
-        # This could include logging an error or initializing leaderboard_table as a DataFrame
-        print("leaderboard_table is not a DataFrame.")
+        # Initialize leaderboard_table properly
+        print("leaderboard_table is not a DataFrame. Initializing...")
+        return pd.DataFrame(columns=COLS)  # Initialize as an empty DataFrame with appropriate columns
 
 dummy1 = gr.Textbox(visible=False)