Extends basic KNN search algorithm

src/math/distance/mod.rs

@@ -2,9 +2,7 @@ pub mod euclidian;
 
 use num_traits::Float;
 
-pub trait Distance<T, A>
-where
-    A: Float
+pub trait Distance<T>
 {
-    fn distance(a: &T, b: &T) -> A;
+    fn distance(a: &T, b: &T) -> f64;
 }