diff --git a/kws/model/max_pooling_RHE.py b/kws/model/max_pooling_RHE.py
index 39a2774..b78568f 100644
--- a/kws/model/max_pooling_RHE.py
+++ b/kws/model/max_pooling_RHE.py
@@ -15,8 +15,6 @@
 import torch
 
 import numpy as np
-import torch
-
 
 def RHE(indice: torch.Tensor, k: int):
     """Regional hard example mining from 'Mining effective negative training samples for keyword spotting'