machine learning - How to know if model is overfitting or

I understand that using cross validation we can validate our model, but it is also possible that maybe our model is underfitting; hence, providing wrong results. One possibility that I can think of

Overfitting and Underfitting

machine learning - How to know if model is overfitting or

machine learning - How to know if model is overfitting or

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python - How to know if underfitting or overfitting is occuring

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