Maths for ML / Notation

y^\hat{y}

hat

FunctionsBeginner

Say it “y hat”

An estimate or prediction of the un-hatted quantity.

Example

y^=f(x)\hat{y} = f(\mathbf{x})

The model's prediction, to compare against the true y.

In code

y_hat = model(x)
y_hat = model(x)

Where you’ll see it in ML

Predictions, estimated parameters, normalized vectors.

Don’t confuse it with

Lessons that use it

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