---
title: "init(validation:maxIterations:overlapFactor:algorithm:featureExtractionTimeWindowSize:)"
framework: createml
role: symbol
role_heading: Initializer
path: "createml/mlsoundclassifier/modelparameters-swift.struct/init(validation:maxiterations:overlapfactor:algorithm:featureextractiontimewindowsize:)"
---

# init(validation:maxIterations:overlapFactor:algorithm:featureExtractionTimeWindowSize:)

Creates a new set of training parameters for a sound classifier with a validation dataset, a training algorithm, and a time-window size.

## Declaration

```swift
init(validation: MLSoundClassifier.ModelParameters.ValidationData = __Defaults.validation, maxIterations: Int = __Defaults.maximumIterations, overlapFactor: Double = __Defaults.overlapFactor, algorithm: MLSoundClassifier.ModelParameters.ModelAlgorithmType = __Defaults.algorithm, featureExtractionTimeWindowSize: TimeInterval = __Defaults.defaultVGGishTimeWindow)
```

## Parameters

- `validation`: A validation dataset represented by an doc://com.apple.createml/documentation/CreateML/MLSoundClassifier/ModelParameters-swift.struct/ValidationData instance.
- `maxIterations`: The largest number of iterations the training session can use to train the sound classifier.
- `overlapFactor`: A proportion of overlap the training session uses to analyze two consecutive windows in the audio data. The proportion must be in the range [0.0, 1.0). Higher proportions generate more training data but also increase the training time. The default value is 0.5, which represents a 50% overlap.
- `algorithm`: An algorithm the training session uses to train the sound classifier.
- `featureExtractionTimeWindowSize`: A time duration, in seconds, the feature-extraction session uses for each audio sample it reads from an audio file in a dataset. The value must be in the range [0.5, 15.0].

## See Also

### Creating parameters

- [init(validation:maxIterations:overlapFactor:)](createml/mlsoundclassifier/modelparameters-swift.struct/init(validation:maxiterations:overlapfactor:).md)
- [init(validation:maxIterations:overlapFactor:algorithm:)](createml/mlsoundclassifier/modelparameters-swift.struct/init(validation:maxiterations:overlapfactor:algorithm:).md)