Update app.py

app.py

@@ -71,7 +71,7 @@ def extract_text_from_file(file):
 
     return file_text
     
-def preprocess_plain_text(text,window_size=window_size):
+def preprocess_plain_text(text,window_size=3):
 
     text = text.encode("ascii", "ignore").decode()  # unicode
     text = re.sub(r"https*\S+", " ", text)  # url