---
title: preprocessor
framework: createmlcomponents
role: symbol
role_heading: Instance Property
path: createmlcomponents/preprocessingsupervisedtabularestimator/preprocessor
---

# preprocessor

The preprocessing transformer.

## Declaration

```swift
var preprocessor: Preprocessor
```

## See Also

### Getting the properties

- [annotationColumnID](createmlcomponents/preprocessingsupervisedtabularestimator/annotationcolumnid.md)
- [estimator](createmlcomponents/preprocessingsupervisedtabularestimator/estimator.md)