style: apply black formatting to unstable_to_stable_backend.py

Author: Dayuxiaoshui

graph_net/torch/backend/unstable_to_stable_backend.py

@@ -157,8 +157,6 @@ def _impl_unstable_to_stable_special_logit(self, gm):
 
         return gm
 
-   
-
     # replace this line with modification code for task 116 (torch._C._linalg.linalg_vector_norm)
 
     # replace this line with modification code for task 117 (torch._C._linalg.linalg_norm)
@@ -177,7 +175,6 @@ def _impl_unstable_to_stable_special_logit(self, gm):
 
     # replace this line with modification code for task 126 (torch._C._nn.scaled_dot_product_attention)
 
-
     def _impl_unstable_to_stable_linear_to_functional_linear(self, gm):
         """
         Convert torch._C._nn.linear to torch.nn.functional.linear
@@ -231,7 +228,7 @@ def _impl_unstable_to_stable_linear_to_functional_linear(self, gm):
         gm.recompile()
 
         return gm
-    
+
     def unstable_to_stable(self, gm):
         methods = (
             name