One challenge is having enough training data. Another is that the training data needs to be free of contamination. For a model trained up till 1900, there needs to be no information from after 1900 that leaks into the data. Some metadata might have that kind of leakage. While it’s not possible to have zero leakage - there’s a shadow of the future on past data because what we store is a function of what we care about - it’s possible to have a very low level of leakage, sufficient for this to be interesting.
香港餐飲聯業協會主席楊振年本身是一家知名中菜酒樓集團的負責人，旗下酒樓自然有火鍋提供，但集團也有經營多家韓式燒烤餐廳。他覺得這方面規定「頗合理」，畢竟火鍋、燒烤餐廳有生肉，寵物犬看見有何反應難以預料，明火也有其危險性。
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没错，它和我们熟悉的防窥贴膜看起来是一样的效果，但传统的防窥贴膜主要依靠内部排列极其细密的黑色光栅，只有正对着手机时，眼睛才能接收到垂直透出的光线，但这种方案的缺点也很明显——透光率和亮度都会急剧变低、有细密条纹干扰的屏幕容易让眼睛疲劳。