A Simple Question of Chemistry

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zoj 1763 A Simple Question of Chemistry

A Simple Question of Chemistry Time Limit: 2 Seconds Memory Limit: 65536 KB Your chemistry lab instructor is a very enthusiastic graduate student who clearly has forgotten what their undergraduate Chemistry 101 lab experience was like. Your inst…

A Simple Question of Chemistry

#include<stdio.h> int main() { int i, l; ]; ]; l = ; ) { l++; } ; a[i]!= && i<l; i++) printf(]); printf("End of Output\n"); ; }…

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Simple Question

一.你会在时间序列数据集上使用什么交叉验证技术?是用k倍? 答:都不是.对于时间序列问题,k倍可能会很麻烦,因为第4年或第5年的一些模式有可能跟第3年的不同,而我们最终可能只是需要对过去几年的进行验证,这就不能用这种方法了.相反,我们可以采用如下所示的5倍正向链接策略: fold 1 : training [1], test [2] fold 2 : training [1 2], test [3] fold 3 : training [1 2 3], test [4] fold 4 : tra…

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