Correcting bug

keywords_evaluate.py

@@ -104,7 +104,7 @@ class Keywords_evaluate(evaluate.Metric):
             f_gold = set(gold)
             if strict:
                 f_ans = set(find)
-                if len(f_ans.difference(f_gold)) == 0:
+                if f_ans == f_gold:
                     correct += 1
             else:
                 f_ans = find[0]