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.
（十二）将在办理治安案件过程中获得的个人信息，依法提取、采集的相关信息、样本用于与治安管理、查处犯罪无关的用途，或者出售、提供给其他单位或者个人的；，详情可参考搜狗输入法2026
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Whatever it happens to be, Nava is (so it seems to me) seeing it with a freshness of perception, a joyful richness of observation, that my 40-year-old eyes simply cannot equal.