使用sklearn.metrics中的‘r2’（决定系数R^2）时，
报错：
UndefinedMetricWarning: R^2 score is not well-defined with less than two samples.
说明Y值只有一个（所以R^2不适用于留一法交叉验证）
详细解决方案
R^2 score is not well-defined with less than two samples
热度：68 发布时间：2024-02-28 00:32:32.0
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