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Hands-On Machine Learning with C# by Matt R. Cole

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Bias-variance trade-off

Before we talk about the bias-variance trade-off, it only makes sense that we would first make sure you are familiar with the individual terms themselves.

When we talk about bias-variance trade-off, bias refers to an error from incorrect assumptions in the learning algorithm. High bias causes what is known as under-fitting, a phenomenon which causes the algorithm to miss relevant feature-output layer relationships in the data.

Variance, on the other hand, is a sensitivity error to small fluctuations in the training set. High variance can cause your algorithm to model random noise rather than the actual intended outputs, a phenomenon known as over-fitting.

There is a trade-off between bias and variance that every machine ...

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