diff --git a/tests/test_layers/test_3d/test_3d.py b/tests/test_layers/test_3d/test_3d.py
index 9d74c8a57..c79dde2a1 100644
--- a/tests/test_layers/test_3d/test_3d.py
+++ b/tests/test_layers/test_3d/test_3d.py
@@ -38,6 +38,7 @@ def check_layer():
     check_loss()
     check_vocab_parallel_loss()
 
+
 def check_layer_and_operation(rank, world_size, port):
     disable_existing_loggers()
     launch(config=CONFIG, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')