chore: change TorchAlgo._device to property

Signed-off-by: SdgJlbl <[email protected]>

substrafl/algorithms/pytorch/torch_base_algo.py

@@ -63,7 +63,7 @@ def __init__(
             np.random.seed(seed)
             torch.manual_seed(seed)
 
-        self._device = self._get_torch_device(use_gpu=use_gpu)
+        self.use_gpu = use_gpu
 
         self._model = model.to(self._device)
         self._optimizer = optimizer
@@ -212,7 +212,8 @@ def _local_train(
             if self._scheduler is not None:
                 self._scheduler.step()
 
-    def _get_torch_device(self, use_gpu: bool) -> torch.device:
+    @property
+    def _device(self) -> torch.device:
         """Get the torch device, CPU or GPU, depending
         on availability and user input.
 
@@ -223,7 +224,7 @@ def _get_torch_device(self, use_gpu: bool) -> torch.device:
             torch.device: Torch device
         """
         device = torch.device("cpu")
-        if use_gpu and torch.cuda.is_available():
+        if self.use_gpu and torch.cuda.is_available():
             device = torch.device("cuda")
         return device