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the value of db_min #4

@xujinchang

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@xujinchang

"double db_min = std::max(log10(totle) * 10 - 60, -99.0);" 能帮忙解释一下这个db_min的取值吗,为什么用rms减去60呢,很好奇这个超参数是怎么选取的,如果我改大些,指纹数减少,会对性能损失影响大吗?

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