Remove unused Python variables in torch/[_-a]* (#133492)

Summary:
X-link: pytorch/pytorch#133492
Approved by: https://github.com/albanD

Reviewed By: clee2000

Differential Revision: D67153461

fbshipit-source-id: 2182ae5048821fd2670dc42e056ebb833986b869

Author: rec

userbenchmark/dynamo/dynamobench/_dynamo/utils.py

@@ -3580,15 +3580,15 @@ def get_torch_function_mode_stack_at(ind):
 
 
 def set_torch_function_mode_stack(stack):
-    for i in range(_len_torch_function_stack()):
+    for _ in range(_len_torch_function_stack()):
         _pop_torch_function_stack()
 
     for mode in stack:
         _push_on_torch_function_stack(mode)
 
 
 def clear_torch_function_mode_stack():
-    for i in range(_len_torch_function_stack()):
+    for _ in range(_len_torch_function_stack()):
         _pop_torch_function_stack()