Function ndarray_linalg::assert::close_l2

pub fn close_l2<A, Tol, S1, S2, D>(
    test: &ArrayBase<S1, D>, 
    truth: &ArrayBase<S2, D>, 
    rtol: Tol
) -> Result<Tol, Tol> where
    A: LinalgScalar + Absolute<Output = Tol>,
    Tol: Float + Sum,
    S1: Data<Elem = A>,
    S2: Data<Elem = A>,
    D: Dimension, 

check two arrays are close in L2 norm