diff --git a/pytorch_lightning/pt_overrides/override_data_parallel.py b/pytorch_lightning/pt_overrides/override_data_parallel.py
index 89b550fdbb..f06f8030ad 100644
--- a/pytorch_lightning/pt_overrides/override_data_parallel.py
+++ b/pytorch_lightning/pt_overrides/override_data_parallel.py
@@ -6,7 +6,6 @@ from itertools import chain
 import threading
 import torch
 from torch.cuda._utils import _get_device_index
-import pdb
 
 
 def _find_tensors(obj):  # pragma: no cover
diff --git a/pytorch_lightning/root_module/grads.py b/pytorch_lightning/root_module/grads.py
index 8ed17a3eec..e368bb5f50 100644
--- a/pytorch_lightning/root_module/grads.py
+++ b/pytorch_lightning/root_module/grads.py
@@ -1,4 +1,3 @@
-import numpy as np
 from torch import nn
 
 """