pub fn new(
        orientations: usize,
        signed: bool,
        cell_side: usize,
        block_side: usize,
        block_stride: usize,
    ) -> HogOptions {
        HogOptions {
            orientations,
            signed,
            cell_side,
            block_side,
            block_stride,
        }
    }
User-provided options, prior to validation.
src/hog.rs