Update tfidf_model.py

tfidf_model.py

@@ -217,7 +217,7 @@ class NLPModel:
                 answers.extend(similarities_max.keys())
                 similarities_per_sentence = similarities_max
             else:
-                for answer, similarity in similarities_max:
+                for answer, similarity in similarities_max.items():
                     similarities_per_sentence[answer] += similarity
             
             similarities_max = {}