fix: ridge regression, formatting

src/linalg/stats.rs

@@ -69,7 +69,6 @@ pub trait MatrixStats<T: RealNumber>: BaseMatrix<T> {
 
     /// Computes the standard deviation along the specified axis.
     fn std(&self, axis: u8) -> Vec<T> {
-
         let mut x = self.var(axis);
 
         let n = match axis {
@@ -141,10 +140,7 @@ mod tests {
 
     #[test]
     fn var() {
-        let m = DenseMatrix::from_2d_array(&[
-            &[1., 2., 3., 4.],
-            &[5., 6., 7., 8.]
-        ]);
+        let m = DenseMatrix::from_2d_array(&[&[1., 2., 3., 4.], &[5., 6., 7., 8.]]);
         let expected_0 = vec![4., 4., 4., 4.];
         let expected_1 = vec![1.25, 1.25];