Update preprocessor.py

preprocessor.py

@@ -62,6 +62,7 @@ def preprocess_whatsapp_messages(file_path, file_type):
     # Additional preprocessing steps:
     # Remove URLs and convert text to lowercase
     df['text'] = df['text'].apply(lambda x: re.sub(r'https?:\/\/\S+', '', x))  # Remove URLs
+    df['text'] = df['text'].apply(lambda x: x.lower())
 
     # Remove emojis, images, stickers, documents while preserving colons after sender names
     df['text'] = df['text'].apply(lambda x: re.sub(r'(?<!\w)(:\s|\s:\s|\s:)', '', x))  # Remove colons that are not part of sender's name