why quality_weight is set 4 and semantic_weight is set 1?

[chensongkui]

why quality_weight is set 4 and semantic_weight is set 1? why both of them are not set 1? Do you have any particular considerations for this setting?
请问为什么quality_weight和semantic_weight分别设为4和1，而不是都设为1？请问这样子的设置背后是有什么考虑吗？我看论文中并没有解释这一点。望解惑，感谢！