---
title: reduction
framework: accelerate
role: symbol
role_heading: Instance Property
path: accelerate/bnnslayerparameterslossbase/reduction
---

# reduction

The function that’s used to reduce the computed loss.

## Declaration

```swift
var reduction: BNNSLossReductionFunction
```

## See Also

### Instance Properties

- [function](accelerate/bnnslayerparameterslossbase/function.md)
- [i_desc](accelerate/bnnslayerparameterslossbase/i_desc.md)
- [o_desc](accelerate/bnnslayerparameterslossbase/o_desc.md)