Update gptzero_free.py

gptzero_free.py

@@ -33,7 +33,10 @@ class GPT2PPL:
         # else:
         #     label = 1
         #     return "The Text is written by Human.", label
-        return {"HUMAN": threshold/100, "AI": 1 - (threshold/100)}
+        normalized_score = (score - 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}
 
     def __call__(self, sentence):
         """