Update app.py

app.py

@@ -30,6 +30,9 @@ def generate_combinations(text, word_reduction_factor, stopwords, semantic_embed
     if keep_tokens is None:
         keep_tokens = {"\n", ".", ",", ";", "!", "?"}
 
+    if word_reduction_factor is None:
+        word_reduction_factor = 0.5
+
     words = text.split()
     total_words = len(words)
     num_remove = int(total_words * word_reduction_factor)