Print test results only if prog_bar_metrics is not empty (#1411)

* Print test results only if prog_bar_metrics is not empty

* Update evaluation_loop.py

Co-authored-by: vitor-guizilini <[email protected]>
Co-authored-by: Jirka Borovec <[email protected]>

Author: 3 people

pytorch_lightning/trainer/evaluation_loop.py

@@ -377,12 +377,11 @@ def run_evaluation(self, test_mode: bool = False):
         self.add_tqdm_metrics(prog_bar_metrics)
 
         # log results of test
-        if test_mode:
-            if self.proc_rank == 0:
-                print('-' * 100)
-                print('TEST RESULTS')
-                pprint(prog_bar_metrics)
-                print('-' * 100)
+        if test_mode and self.proc_rank == 0 and prog_bar_metrics:
+            print('-' * 80)
+            print('TEST RESULTS')
+            pprint(prog_bar_metrics)
+            print('-' * 80)
 
         # log metrics
         self.log_metrics(log_metrics, {})