Change return type of Mul output

Co-authored-by: bluss <[email protected]>

Author: emmatyping

src/linalg/impl_linalg.rs

@@ -711,7 +711,7 @@ where
     S1: Data<Elem = A>,
     S2: Data<Elem = A>,
     A: LinalgScalar,
-    A: std::ops::Mul<&'a ArrayBase<S2, Ix2>, Output = ArrayBase<OwnedRepr<A>, Ix2>>,
+    A: std::ops::Mul<&'a ArrayBase<S2, Ix2>, Output = Array<A, Ix2>>,
 {
     let dimar = a.shape()[0];
     let dimac = a.shape()[1];