Do not explicitly set device in curve cosntructor as it follows from the other input arguments

Author: sorenhauberg

stochman/curves.py

@@ -13,6 +13,7 @@ def __init__(
         end: torch.Tensor,
         num_nodes: int = 5,
         requires_grad: bool = True,
+        device = None,
         *args,
         **kwargs,
     ) -> None: