Function simple_ml::element_wise_operation

pub fn element_wise_operation<T>(
    a: &Vec<T>, 
    b: &Vec<T>, 
    operation: &str
) -> Vec<T> where
    T: Copy + Debug + Mul<Output = T> + Add<Output = T> + Sub<Output = T> + Div<Output = T> + PartialEq + FromStr,
    <T as FromStr>::Err: Debug,