---
title: "MLImageClassifier.FeatureExtractorType.custom(_:)"
framework: createml
role: symbol
role_heading: Case
path: "createml/mlimageclassifier/featureextractortype/custom(_:)"
---

# MLImageClassifier.FeatureExtractorType.custom(_:)

A feature extractor that you provide as a Core ML model file or a layer within that file.

## Declaration

```swift
case custom(MLImageClassifier.CustomFeatureExtractor)
```

## Parameters

- `_`: Custom feature extractor to be used for extracting features.

## Discussion

Discussion A custom feature extractor is a neural network model you provide to an MLImageClassifier. The feature extractor can be a layer within the model or the model itself. In either case, the neural network must take an image as input and output an MLMultiArray.

## See Also

### Selecting a feature extractor type

- [MLImageClassifier.FeatureExtractorType.scenePrint(revision:)](createml/mlimageclassifier/featureextractortype/sceneprint(revision:).md)
- [MLImageClassifier.CustomFeatureExtractor](createml/mlimageclassifier/customfeatureextractor.md)