Add loss and optimizer as properties

Signed-off-by: abigailt <abigailt@il.ibm.com>

apt/utils/models/pytorch_model.py

@@ -304,8 +304,28 @@ class PyTorchClassifier(PyTorchModel):
                                   queries that can be submitted. Optional, Default is True.
         """
         super().__init__(model, output_type, black_box_access, unlimited_queries, **kwargs)
+        self._loss = loss
+        self._optimizer = optimizer
         self._art_model = PyTorchClassifierWrapper(model, loss, input_shape, nb_classes, optimizer)
 
+    @property
+    def loss(self):
+        """
+        The pytorch model's loss function
+
+        :return: The pytorch model's loss function
+        """
+        return self._loss
+
+    @property
+    def optimizer(self):
+        """
+        The pytorch model's optimizer
+
+        :return: The pytorch model's optimizer
+        """
+        return self._optimizer
+
     def fit(
         self,
         train_data: PytorchData,