try to fix bug

horizon-metrics.py

@@ -179,6 +179,8 @@ class HorizonMetrics(evaluate.Metric):
         # this means that the metric was called using the input field on huggingface website
 
         try:
+            self.ground_truth_det = references
+            self.predictions = predictions
             print(np.asarray(self.ground_truth_det).shape)
             print(np.asarray(self.predictions).shape)
         except: