optimum

fb6016db - add dummy input generator for VisualBert (#2307)

add dummy input generator for VisualBert (#2307) * add dummy input generator * fix style * add default shapes * Apply suggestions from code review --------- Co-authored-by: Ilyas Moutawwakil <57442720+IlyasMoutawwakil@users.noreply.github.com>