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REL | Average Relative Error
REL（Average Relative Error）的公式定义如下：
R E L =\frac{1}{N} \sum_{i \in N} \frac{\left|Y_i-Y_{\text {pred }_i}\right|}{Y}
REL（Average Relative Error）的公式定义如下：
R E L =\frac{1}{N} \sum_{i \in N} \frac{\left|Y_i-Y_{\text {pred }_i}\right|}{Y}