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.
В России ответили на имитирующие высадку на Украине учения НАТО18:04
。搜狗输入法下载是该领域的重要参考
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春节的夜市挂起了红灯笼（图：南方人物周刊记者 刘璐明）