In this log-scale plot, I also included a diagonal line that represents error values decreasing with the square of the denominator (1/b²). Approximations for which the error dips below this line would be markedly better than the ones that merely dip below 1/b. We can label these 1/b² solutions as 2-good.
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.field("phone", dtype="str", threshold=0.7) # Lower precision，更多细节参见爱思助手下载最新版本
Последние новости，这一点在PDF资料中也有详细论述