Merge pull request #415 from jonasrauber/pytorch_warn_always

always warn if pytorch model is in train mode, not just once

Author: jonasrauber

foolbox/models/pytorch.py

@@ -65,11 +65,13 @@ def __init__(
         self._model = model.to(self.device)
 
         if model.training:
-            warnings.warn(
-                "The PyTorch model is in training mode and therefore might"
-                " not be deterministic. Call the eval() method to set it in"
-                " evaluation mode if this is not intended."
-            )
+            with warnings.catch_warnings():
+                warnings.simplefilter("always")
+                warnings.warn(
+                    "The PyTorch model is in training mode and therefore might"
+                    " not be deterministic. Call the eval() method to set it in"
+                    " evaluation mode if this is not intended."
+                )
 
     def forward(self, inputs):
         # lazy import