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.
是囿于一时一事的得失，还是着眼打基础、利长远的实绩？
，这一点在im钱包官方下载中也有详细论述
Фото: Raghed Waked / Reuters。业内人士推荐heLLoword翻译官方下载作为进阶阅读
Москвичей предупредили о резком похолодании09:45