今天天气-7℃至6℃，晴 北风2级左右转3、4级（阵风7级左右）明天天气晴间多云 北风2、3间4级(阵风6级)，-4℃至3℃后天天气晴间多云 北风3级左右（阵风6级），-5℃至3℃气象信息由北京市专业气象台、中国气象网12月24日18时提供SourcePh" style="display:none"
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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.