---
title: beta1
framework: accelerate
role: symbol
role_heading: Instance Property
path: accelerate/bnns/adamoptimizer/beta1
---

# beta1

A value that specifies the first-moment constant, in the range 0 to 1.

## Declaration

```swift
var beta1: Float { get set }
```

## See Also

### Inspecting the Properties of an Adam Optimizer

- [learningRate](accelerate/bnns/adamoptimizer/learningrate.md)
- [beta2](accelerate/bnns/adamoptimizer/beta2.md)
- [timeStep](accelerate/bnns/adamoptimizer/timestep.md)
- [epsilon](accelerate/bnns/adamoptimizer/epsilon.md)
- [gradientScale](accelerate/bnns/adamoptimizer/gradientscale.md)
- [regularizationScale](accelerate/bnns/adamoptimizer/regularizationscale.md)
- [gradientBounds](accelerate/bnns/adamoptimizer/gradientbounds.md)
- [gradientClipping](accelerate/bnns/adamoptimizer/gradientclipping.md)
- [regularizationFunction](accelerate/bnns/adamoptimizer/regularizationfunction.md)
- [usesAMSGrad](accelerate/bnns/adamoptimizer/usesamsgrad.md)
- [accumulatorCountMultiplier](accelerate/bnns/adamoptimizer/accumulatorcountmultiplier.md)
- [BNNS.GradientClipping](accelerate/bnns/gradientclipping.md)