Small changes.

src/lib.rs

@@ -326,27 +326,29 @@ impl TrueSkill {
 
             for n in t..t + current.len() {
                 rotated_a_matrix[(row, n)] = flatten_weights[n];
+
                 t += 1;
                 x += 1;
             }
 
             for n in x..x + next.len() {
                 rotated_a_matrix[(row, n)] = -flatten_weights[n];
+
                 x += 1;
             }
         }
 
         let a_matrix = rotated_a_matrix.transpose();
 
-        let _ata = self.beta.powi(2) * &rotated_a_matrix * &a_matrix;
-        let _atsa = &rotated_a_matrix * &variance_matrix * &a_matrix;
+        let ata = self.beta.powi(2) * &rotated_a_matrix * &a_matrix;
+        let atsa = &rotated_a_matrix * &variance_matrix * &a_matrix;
 
         let start = mean_matrix.transpose() * &a_matrix;
-        let middle = &_ata + &_atsa;
+        let middle = &ata + &atsa;
         let end = &rotated_a_matrix * &mean_matrix;
 
         let e_arg = (-0.5 * &start * &middle.inverse() * &end).determinant();
-        let s_arg = _ata.determinant() / middle.determinant();
+        let s_arg = ata.determinant() / middle.determinant();
 
         e_arg.exp() * s_arg.sqrt()
     }
@@ -423,7 +425,7 @@ mod tests {
 
         assert_relative_eq!(
             ts.quality(&[&[alice], &[bob]]),
-            0.447_213_595_499_957_9,
+            0.4472135954999579,
             epsilon = EPSILON
         );
     }