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pytorch_lightning/trainer/trainer.py

@@ -1335,7 +1335,7 @@ class Trainer(TrainerIOMixin):
             log_output = output['log']
 
             # reduce progress metrics for tqdm when using dp
-            if train and(self.use_dp or self.use_ddp2):
+            if train and (self.use_dp or self.use_ddp2):
                 nb_gpus = self.num_gpus
                 log_output = reduce_distributed_output(log_output, nb_gpus)