Clean up dependencies

src/kernel/exponential.rs

@@ -62,7 +62,6 @@ impl Kernel for Exponential {
 
 #[cfg(test)]
 mod tests {
-    extern crate blis_src;
     extern crate intel_mkl_src;
 
     use approx::assert_abs_diff_eq;
@@ -133,18 +132,4 @@ mod tests {
 
         assert_abs_diff_eq!(Array::from(vars), kernel.k_diag(&ts));
     }
-
-    #[test]
-    fn test_ssm_matrices() {
-        let kernel = Exponential::new(1.1, 2.2);
-
-        let deltas = [0.01, 1.0, 10.0];
-
-        for delta in &deltas {
-            assert_abs_diff_eq!(
-                crate::kernel::transition(0.0, *delta, kernel.feedback()),
-                kernel.transition(0.0, *delta)
-            );
-        }
-    }
 }