fix: more refactoring

src/optimization/mod.rs

@@ -1,10 +1,8 @@
 pub mod first_order;
 pub mod line_search;
 
-use crate::linalg::Matrix;
-
-pub type F<'a, X: Matrix> = dyn for<'b> Fn(&'b X) -> f64 + 'a;
-pub type DF<'a, X: Matrix> = dyn for<'b> Fn(&'b mut X, &'b X) + 'a;
+pub type F<'a, X> = dyn for<'b> Fn(&'b X) -> f64 + 'a;
+pub type DF<'a, X> = dyn for<'b> Fn(&'b mut X, &'b X) + 'a;
 
 #[derive(Debug, PartialEq)]
 pub enum FunctionOrder {