Update gptzero_free.py

gptzero_free.py

@@ -33,7 +33,7 @@ class GPT2PPL:
         # else:
         #     label = 1
         #     return "The Text is written by Human.", label
-        normalized_score = (score - 60) / 2
+        normalized_score = (threshold - 60) / 2
         # Cap the values at 0 and 100
         human_score = max(0, min(1, normalized_score))
         return {"HUMAN": human_score, "AI": 1 - human_score}