---
title: MLDecisionTreeRegressor.ModelParameters
framework: createml
role: symbol
role_heading: Structure
path: createml/mldecisiontreeregressor/modelparameters-swift.struct
---

# MLDecisionTreeRegressor.ModelParameters

Parameters that affect the process of training a model.

## Declaration

```swift
struct ModelParameters
```

## Topics

### Creating parameters

- [init(validation:maxDepth:minLossReduction:minChildWeight:randomSeed:)](createml/mldecisiontreeregressor/modelparameters-swift.struct/init(validation:maxdepth:minlossreduction:minchildweight:randomseed:).md)
- [init(validationData:maxDepth:minLossReduction:minChildWeight:randomSeed:)](createml/mldecisiontreeregressor/modelparameters-swift.struct/init(validationdata:maxdepth:minlossreduction:minchildweight:randomseed:).md)
- [MLDecisionTreeRegressor.ModelParameters.ValidationData](createml/mldecisiontreeregressor/modelparameters-swift.struct/validationdata-swift.enum.md)

### Accessing parameters

- [maxDepth](createml/mldecisiontreeregressor/modelparameters-swift.struct/maxdepth.md)
- [minChildWeight](createml/mldecisiontreeregressor/modelparameters-swift.struct/minchildweight.md)
- [minLossReduction](createml/mldecisiontreeregressor/modelparameters-swift.struct/minlossreduction.md)
- [randomSeed](createml/mldecisiontreeregressor/modelparameters-swift.struct/randomseed.md)
- [validationData](createml/mldecisiontreeregressor/modelparameters-swift.struct/validationdata-swift.property.md)
- [validation](createml/mldecisiontreeregressor/modelparameters-swift.struct/validation.md)

### Describing parameters

- [description](createml/mldecisiontreeregressor/modelparameters-swift.struct/description.md)
- [debugDescription](createml/mldecisiontreeregressor/modelparameters-swift.struct/debugdescription.md)
- [playgroundDescription](createml/mldecisiontreeregressor/modelparameters-swift.struct/playgrounddescription.md)

### Default Implementations

- [CustomDebugStringConvertible Implementations](createml/mldecisiontreeregressor/modelparameters-swift.struct/customdebugstringconvertible-implementations.md)
- [CustomPlaygroundDisplayConvertible Implementations](createml/mldecisiontreeregressor/modelparameters-swift.struct/customplaygrounddisplayconvertible-implementations.md)
- [CustomStringConvertible Implementations](createml/mldecisiontreeregressor/modelparameters-swift.struct/customstringconvertible-implementations.md)

## Relationships

### Conforms To

- [Copyable](swift/copyable.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomPlaygroundDisplayConvertible](swift/customplaygrounddisplayconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Escapable](swift/escapable.md)

## See Also

### Inspecting a decision tree regressor

- [model](createml/mldecisiontreeregressor/model.md)
- [modelParameters](createml/mldecisiontreeregressor/modelparameters-swift.property.md)