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# fitted(to:validateOn:eventHandler:)

Fits a transformer to a data frame.

```
func fitted(to input: DataFrame, validateOn validation: DataFrame?, eventHandler: EventHandler? = nil) async throws -> UpdatableTabularEstimatorToSupervisedAdaptor<Estimator, Annotation>.Transformer
```

## Parameters

`input`

A data frame containing examples used for fitting the transformer.

`validation`

A data frame containing examples used for validating the fitted transformer.

`eventHandler`

An event handler.

## Return Value

The fitted transformer.

---

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