---
title: MLParameterDescription
framework: coreml
role: symbol
role_heading: Class
path: coreml/mlparameterdescription
---

# MLParameterDescription

A description of a model parameter that includes a default value and a constraint, if applicable.

## Declaration

```swift
class MLParameterDescription
```

## Topics

### Describing the model parameter

- [defaultValue](coreml/mlparameterdescription/defaultvalue.md)
- [key](coreml/mlparameterdescription/key.md)

### Constraining numeric values

- [numericConstraint](coreml/mlparameterdescription/numericconstraint.md)
- [MLNumericConstraint](coreml/mlnumericconstraint.md)

### Initializers

- [init(coder:)](coreml/mlparameterdescription/init(coder:).md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)

## See Also

### Accessing update descriptions

- [isUpdatable](coreml/mlmodeldescription/isupdatable.md)
- [trainingInputDescriptionsByName](coreml/mlmodeldescription/traininginputdescriptionsbyname.md)
- [parameterDescriptionsByKey](coreml/mlmodeldescription/parameterdescriptionsbykey.md)