根据表格序列H，回答问题Q。
问题Q：What is the percentage improvement of R@1 achieved by Cross-VAEs compared to BERTQA?
表格序列H：Method MRR R@1 R@5 SSE
BERTQA 37.90 30.81 45.24 0.23
Cross-VAEs 48.52 44.55 53.52 0.09
 Do not include the following keywords: vaes, 。, 表格序列h：method, 根据表格序列h，回答问题q
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