What Are Overfitting and Underfitting in Machine Learning?

Anas Al-Masri
Towards Data Science
6 min readJun 21, 2019

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As you enter the realm of Machine Learning, several ambiguous terms will introduce themselves. Terms like Overfitting, Underfitting, and bias-variance trade-off. These concepts lie at the core of the field of Machine Learning in general. In this post, I explain those terms with an example.

Why should we even care?

Arguably, Machine Learning models have one sole purpose; to generalize well. I have mentioned this in several previous posts, but it never hurts to emphasize on it.

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