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# MLImageClassifier.FeatureExtractorType

The underlying base model that extracts image features for image classifier training session.

```
enum FeatureExtractorType
```

## Overview

Create ML has one built-in feature extractor: `scenePrint`. Alternatively, you can provide your own custom
feature extractor from an `.mlmodel` file or a specific layer within a model file.

## Topics

### Selecting a feature extractor type

[`case scenePrint(revision: Int?)`](/documentation/CreateML/MLImageClassifier/FeatureExtractorType/scenePrint(revision:))

A feature extractor trained on millions of images.

[`case custom(MLImageClassifier.CustomFeatureExtractor)`](/documentation/CreateML/MLImageClassifier/FeatureExtractorType/custom(_:))

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

[`struct CustomFeatureExtractor`](/documentation/CreateML/MLImageClassifier/CustomFeatureExtractor)

A custom feature extractor a training session uses to train an image classifier.

### Describing a feature extractor type

[`var description: String`](/documentation/CreateML/MLImageClassifier/FeatureExtractorType/description)

A text representation of the feature extractor.

[`var debugDescription: String`](/documentation/CreateML/MLImageClassifier/FeatureExtractorType/debugDescription)

A text representation of the feature extractor that’s suitable for output during debugging.

[`var playgroundDescription: Any`](/documentation/CreateML/MLImageClassifier/FeatureExtractorType/playgroundDescription)

A description of the feature extractor shown in a playground.

### Default Implementations

[CustomDebugStringConvertible Implementations](/documentation/CreateML/MLImageClassifier/FeatureExtractorType/CustomDebugStringConvertible-Implementations)

[CustomPlaygroundDisplayConvertible Implementations](/documentation/CreateML/MLImageClassifier/FeatureExtractorType/CustomPlaygroundDisplayConvertible-Implementations)

[CustomStringConvertible Implementations](/documentation/CreateML/MLImageClassifier/FeatureExtractorType/CustomStringConvertible-Implementations)

## Relationships

### Conforms To

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`Copyable`](/documentation/Swift/Copyable)

[`Escapable`](/documentation/Swift/Escapable)

[`CustomPlaygroundDisplayConvertible`](/documentation/Swift/CustomPlaygroundDisplayConvertible)

[`Sendable`](/documentation/Swift/Sendable)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

---

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