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# update(_:withPreprocessed:eventHandler:)

Updates a transformer with a new data frame of preprocessed features.

```
func update(_ transformer: inout PreprocessingUpdatableTabularEstimator<Preprocessor, Estimator>.Transformer, withPreprocessed preprocessed: DataFrame, eventHandler: EventHandler? = nil) async throws
```

## Parameters

`transformer`

A transformer to update.

`preprocessed`

A data frame of preprocessed features.

`eventHandler`

An event handler.

---

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