fix(pytorch): resolve critical action rescaling bug (#403)

This commit addresses a critical bug related to action rescaling in
PyTorch, which was preventing the agent from training effectively in
specific environments.

stable_learning_control/algos/pytorch/common/helpers.py

@@ -126,24 +126,17 @@ def rescale(data, min_bound, max_bound):
             the desired range.
 
     Returns:
-        torch.Tensor: Array which has it values scaled between the min and max
-            boundaries.
+        Union[Torch.Tensor, numpy.ndarray]: Array which has it values scaled between
+            the min and max boundaries.
     """
-    data = torch.tensor(data) if not isinstance(data, torch.Tensor) else data
-    min_bound = (
-        torch.tensor(min_bound, device=data.device)
-        if not isinstance(min_bound, torch.Tensor)
-        else min_bound.to(data.device)
-    )
-    max_bound = (
-        torch.tensor(max_bound, device=data.device)
-        if not isinstance(max_bound, torch.Tensor)
-        else max_bound.to(data.device)
-    )
+    was_numpy = isinstance(data, np.ndarray)
+    data = torch.as_tensor(data)
+    min_bound = torch.as_tensor(min_bound, device=data.device)
+    max_bound = torch.as_tensor(max_bound, device=data.device)
 
     # Return rescaled data in the same format as the input data.
     data_rescaled = (data + 1.0) * (max_bound - min_bound) / 2 + min_bound
-    return data_rescaled.astype(data.dtype) if isinstance(data, np.ndarray) else data
+    return data_rescaled.cpu().numpy() if was_numpy else data_rescaled
 
 
 def np_to_torch(input_object, dtype=None, device=None):