diff --git a/app/service/image2sketch/server.py b/app/service/image2sketch/server.py
index ebd363e..7a15b55 100644
--- a/app/service/image2sketch/server.py
+++ b/app/service/image2sketch/server.py
@@ -55,6 +55,9 @@ class Image2SketchServer:
         self.data['A'] = transform(A)
         self.data['A'] = self.data['A'].unsqueeze(0).to(device)
 
+    def __del__(self):
+        torch.cuda.empty_cache()
+
     def get_result(self):
         self.model.set_input(self.data)
         self.model.test()  # run inference