Function reduce_all_cpu_serial 

pub fn reduce_all_cpu_serial<TI, TS, TO, D, I, F, FSum, FOut>(
    a: &[TI],
    la: &Layout<D>,
    init: I,
    f: F,
    f_sum: FSum,
    f_out: FOut,
) -> Result<TO, Error>
where
    TI: Clone,
    TS: Clone,
    D: DimAPI,
    I: Fn() -> TS,
    F: Fn(TS, TI) -> TS,
    FSum: Fn(TS, TS) -> TS,
    FOut: Fn(TS) -> TO,