diff --git a/codes/data/__init__.py b/codes/data/__init__.py
index ac426ba1..81a915ad 100644
--- a/codes/data/__init__.py
+++ b/codes/data/__init__.py
@@ -20,7 +20,7 @@ def create_dataloader(dataset, dataset_opt, opt=None, sampler=None, collate_fn=N
             batch_size = dataset_opt['batch_size']
         return torch.utils.data.DataLoader(dataset, batch_size=batch_size, shuffle=shuffle,
                                            num_workers=num_workers, sampler=sampler, drop_last=True,
-                                           pin_memory=pin_memory, collate_fn=collate_fn)
+                                           pin_memory=pin_memory, collate_fn=collate_fn, persistent_workers=True)
     else:
         batch_size = dataset_opt['batch_size'] or 1
         return torch.utils.data.DataLoader(dataset, batch_size=batch_size, shuffle=False, num_workers=0,