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Consumers are watching warily for trickle-down effects on prices at the pump. The national average for a gallon of regular unleaded gasoline hit a multiyear low of $2.73 per gallon early this year. It’s now back up to $2.96 and rising, so it will cross the $3 threshold any day now, said Patrick De Haan, head of petroleum analysis at GasBuddy.，这一点在WPS官方版本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.