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.
每天放学，我都会跟她聊当天幼儿园发生的事，都做了什么，交到朋友了吗？喜欢跟谁一起玩。整体来说，她的适应能力很快，老师也很喜欢她，她每天挺开心，她开心，我就很开心。
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