Implement SVR and SVR kernels with Enum. Add tests for argsort_mut (#303)

* Add tests for argsort_mut
* Add formatting and cleaning up .github directory
* fix clippy error. suggestion to use .contains()
* define type explicitly for variable jstack
* Implement kernel as enumerator
* basic svr and svr_params implementation
* Complete enum implementation for Kernels. Implement search grid for SVR. Add documentation.
* Fix serde configuration in cargo clippy
*  Implement search parameters (#304)
* Implement SVR kernels as enumerator
* basic svr and svr_params implementation
* Implement search grid for SVR. Add documentation.
* Fix serde configuration in cargo clippy
* Fix wasm32 typetag
* fix typetag
* Bump to version 0.4.2

src/linalg/basic/arrays.rs

@@ -619,7 +619,7 @@ pub trait MutArrayView1<T: Debug + Display + Copy + Sized>:
         T: Number + PartialOrd,
     {
         let stack_size = 64;
-        let mut jstack = -1;
+        let mut jstack: i32 = -1;
         let mut l = 0;
         let mut istack = vec![0; stack_size];
         let mut ir = self.shape() - 1;
@@ -2190,4 +2190,29 @@ mod tests {
 
         assert_eq!(result, [65, 581, 30])
     }
+
+    #[test]
+    fn test_argsort_mut_exact_boundary() {
+        // Test index == length - 1 case
+        let boundary =
+            DenseMatrix::from_2d_array(&[&[1.0, 2.0, 3.0, f64::MAX], &[3.0, f64::MAX, 0.0, 2.0]])
+                .unwrap();
+        let mut view0: Vec<f64> = boundary.get_col(0).iterator(0).copied().collect();
+        let indices = view0.argsort_mut();
+        assert_eq!(indices.last(), Some(&1));
+        assert_eq!(indices.first(), Some(&0));
+
+        let mut view1: Vec<f64> = boundary.get_col(3).iterator(0).copied().collect();
+        let indices = view1.argsort_mut();
+        assert_eq!(indices.last(), Some(&0));
+        assert_eq!(indices.first(), Some(&1));
+    }
+
+    #[test]
+    fn test_argsort_mut_filled_array() {
+        let matrix = DenseMatrix::<f64>::rand(1000, 1000);
+        let mut view: Vec<f64> = matrix.get_col(0).iterator(0).copied().collect();
+        let sorted = view.argsort_mut();
+        assert_eq!(sorted.len(), 1000);
+    }
 }