---
title: "update(_:with:eventHandler:)"
framework: createmlcomponents
role: symbol
role_heading: Instance Method
path: "createmlcomponents/boostedtreeregressor/update(_:with:eventhandler:)"
---

# update(_:with:eventHandler:)

Updates a transformer with a new sequence of examples.

## Declaration

```swift
func update(_ transformer: inout TreeRegressorModel, with input: DataFrame, eventHandler: EventHandler?) async throws
```

## Parameters

- `transformer`: A transformer to update.
- `input`: A data frame containing examples.
- `eventHandler`: An event handler.