// Hypothetical compression API...
(logging all transactions) or filling in pre-printed forms such as receipts，推荐阅读同城约会获取更多信息
，这一点在safew官方下载中也有详细论述
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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.