---
title: "fitted(to:validateOn:eventHandler:)"
framework: createmlcomponents
role: symbol
role_heading: Instance Method
path: "createmlcomponents/updatabletabularestimatortosupervisedadaptor/fitted(to:validateon:eventhandler:)"
---

# fitted(to:validateOn:eventHandler:)

Fits a transformer to a data frame.

## Declaration

```swift
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

Return Value The fitted transformer.

## See Also

### Fitting

- [makeTransformer()](createmlcomponents/updatabletabularestimatortosupervisedadaptor/maketransformer().md)
- [update(_:with:eventHandler:)](createmlcomponents/updatabletabularestimatortosupervisedadaptor/update(_:with:eventhandler:).md)
- [Transformer](createmlcomponents/transformer.md)