Overfitting/Underfitting vs. Bias/Variance in Supervised Machine Learning
The left plot shows fitting a straight line to the data. This is not a very good fit. So, it is underfitting the data and we call it high bias. On the opposite end, if you fit an incredibly complex classifier, maybe you can fit the data perfectly, but that doesn't look like a great fit either. So there's a classifier of high variance and this is overfitting the data. And there might be some classifier in between, with a medium level of complexity, that maybe fits it correctly.
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