Function slice 

pub fn slice<R, T, B, D, I>(
    tensor: &TensorBase<Storage<R, T, B>, D>,
    index: I,
) -> TensorBase<Storage<DataRef<'_, <B as DeviceRawAPI<T>>::Raw>, T, B>, Vec<usize>>
where
    D: DimAPI,
    I: TryInto<AxesIndex<Indexer>, Error = Error>,
    R: DataAPI<Data = <B as DeviceRawAPI<T>>::Raw>,
    B: DeviceAPI<T>,