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.
不僅是過去年，如今「家庭平均食物籃」成本是五年前的8倍，是2016年的30倍以上。，推荐阅读heLLoword翻译官方下载获取更多信息
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The number of female rough sleepers rose by 8% to 733, while there were 3,938 men and another 122 cases where the gender was not recorded.
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