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並前往https://stackoverflow.com/questions/43162506/undefinedmetricwarning-f-score-is-ill-defined-and-being-set-to-0-0-in-labels-wi

F-score is ill-defined and being set to 0.0 in labels with no ...

As mentioned in the comments, some labels in y_test don't appear in y_pred . Specifically in this case, label '2' is never predicted: >>> set(y_test) ...

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