Merge pull request #1223 from inesvalentim/fix_issue_1221

Fix device_type of default preprocessor of PyTorchEstimator

Author: beat-buesser

art/estimators/pytorch.py

@@ -66,7 +66,9 @@ def __init__(self, device_type: str = "gpu", **kwargs) -> None:
         if isinstance(preprocessing, tuple):
             from art.preprocessing.standardisation_mean_std.pytorch import StandardisationMeanStdPyTorch
 
-            kwargs["preprocessing"] = StandardisationMeanStdPyTorch(mean=preprocessing[0], std=preprocessing[1])
+            kwargs["preprocessing"] = StandardisationMeanStdPyTorch(
+                mean=preprocessing[0], std=preprocessing[1], device_type=device_type
+            )
 
         super().__init__(**kwargs)