try to fix error

horizon-metrics.py

@@ -179,11 +179,14 @@ class HorizonMetrics(evaluate.Metric):
         # this means that the metric was called using the input field on huggingface website
 
         try:
-            print(np.asarray(predictions).shape)
-            print(np.asarray(references).shape)
+            if len(np.asarray(predictions).shape) == 4 and len(
+                    np.asarray(references).shape) == 4:
+                self.ground_truth_det = references[0]
+                self.predictions = predictions[0]
+            print("transformed")
         except:
             # no nothing
-            print("error")
+            print("do nothing")
             pass
 
         # calculate erros and store values in slope_error_list and midpoint_error_list