Check training data

app.py

@@ -59,6 +59,7 @@ def thanks(sentiment):
     global training_df
     # Append training data set
     training_df = training_df.append({'Sentiment': sentiment, 'Headline_string': random_sample['Headline_string'].iloc[0], 'Headline': random_sample['Headline'].iloc[0] }, ignore_index=True)
+    training_df = training_df.drop_duplicates(subset='Headline_string').reset_index(drop=True)
     
     # Upload training data set
     ds = Dataset.from_pandas(training_df)