Fix formatting

Author: ValerianRey

src/torchjd/sparse/_structured_sparse_tensor.py

@@ -279,10 +279,14 @@ def make_sst(physical: Tensor, strides: Tensor) -> StructuredSparseTensor:
 
 
 def fix_zero_stride_columns(physical: Tensor, strides: Tensor) -> tuple[Tensor, Tensor]:
-    """Remove columns of strides that are all 0 and sum the corresponding elements in the physical tensor."""
+    """
+    Remove columns of strides that are all 0 and sum the corresponding elements in the physical
+    tensor.
+    """
+
     are_columns_zero = (strides == 0).all(dim=0)
 
-    if not (are_columns_zero).any():
+    if not are_columns_zero.any():
         return physical, strides
 
     zero_column_indices = torch.arange(len(are_columns_zero))[are_columns_zero].tolist()