---
title: beta1
framework: coreml
role: symbol
role_heading: Type Property
path: coreml/mlparameterkey/beta1
---

# beta1

The key you use to access the Adam optimizer’s first beta parameter.

## Declaration

```swift
class var beta1: MLParameterKey { get }
```

## Discussion

Discussion The value type for the beta1 key is a Double.

## See Also

### Accessing model update parameters

- [learningRate](coreml/mlparameterkey/learningrate.md)
- [momentum](coreml/mlparameterkey/momentum.md)
- [miniBatchSize](coreml/mlparameterkey/minibatchsize.md)
- [beta2](coreml/mlparameterkey/beta2.md)
- [eps](coreml/mlparameterkey/eps.md)
- [epochs](coreml/mlparameterkey/epochs.md)
- [shuffle](coreml/mlparameterkey/shuffle.md)
- [seed](coreml/mlparameterkey/seed.md)