Remove self

Signed-off-by: Beat Buesser <[email protected]>

Author: Beat Buesser

art/defences/preprocessor/preprocessor.py

@@ -277,7 +277,7 @@ def __call__(self, x: np.ndarray, y: Optional[np.ndarray] = None) -> Tuple[np.nd
     def estimate_gradient(self, x: np.ndarray, grad: np.ndarray) -> np.ndarray:
         import tensorflow as tf  # lgtm [py/repeated-import]
 
-        def get_gradient(self, x: np.ndarray, grad: np.ndarray) -> np.ndarray:
+        def get_gradient(x: np.ndarray, grad: np.ndarray) -> np.ndarray:
             """
             Helper function for estimate_gradient
             """