Fix LGTM alerts

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

Author: Beat Buesser

art/estimators/certification/randomized_smoothing/numpy.py

@@ -36,7 +36,9 @@
 logger = logging.getLogger(__name__)
 
 
-class NumpyRandomizedSmoothing(RandomizedSmoothingMixin, ClassGradientsMixin, ClassifierMixin, BaseEstimator):
+class NumpyRandomizedSmoothing(
+    RandomizedSmoothingMixin, ClassGradientsMixin, ClassifierMixin, BaseEstimator  # lgtm [py/missing-call-to-init]
+):
     """
     Implementation of Randomized Smoothing applied to classifier predictions and gradients, as introduced
     in Cohen et al. (2019).