exception

ecqa.py

@@ -137,6 +137,9 @@ class ecqa(evaluate.Metric):
 
         true_positive = Counter(predictied_chars) & Counter(referenced_chars)
         n_true_positive = sum(true_positive.values())
+        if n_true_positive == 0:
+            return 0, 0, 0
+
         precision = 1.0 * n_true_positive / len(predictied_chars)
         recall = 1.0 * n_true_positive / len(referenced_chars)
         f1 = (2 * precision * recall) / (precision + recall)