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# update(_:with:eventHandler:)

Updates a transformer with a new sequence of examples.

```
func update(_ transformer: inout ColumnSelector<Estimator, UnwrappedInput>.Transformer, with input: DataFrame, eventHandler: EventHandler? = nil) async throws
```

## Parameters

`transformer`

A transformer to update.

`input`

A sequence of examples.

`eventHandler`

An event handler.

---

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