---
title: "init(descriptor:)"
framework: ML Compute
role: symbol
role_heading: Initializer
platforms: [iOS 15.0+, iPadOS 15.0+, Mac Catalyst 15.0+, macOS 12.0+, tvOS 15.0+]
path: "mlcompute/mlcadamwoptimizer/init(descriptor:)"
---

# init(descriptor:)

Creates a default optimizer with the descriptor you specify.

## Declaration

```swift
convenience init(descriptor optimizerDescriptor: MLCOptimizerDescriptor)
```

## Parameters

- `optimizerDescriptor`: An object for configuring the optimizer.

## Return Value

Return Value An AdamW optimizer.

## Discussion

Discussion Sets beta1 to 0.9, beta2 to 0.999, epsilon to 1e-8, usesAMSGrad to false, and timeStep to 1 by default.

## See Also

### Creating an AdamW Optimizer

- [init(descriptor:beta1:beta2:epsilon:usesAMSGrad:timeStep:)](mlcompute/mlcadamwoptimizer/init(descriptor:beta1:beta2:epsilon:usesamsgrad:timestep:).md)