---
title: b_desc
framework: accelerate
role: symbol
role_heading: Instance Property
path: accelerate/bnnslstmgatedescriptor/b_desc
---

# b_desc

The descriptor of the bias.

## Declaration

```swift
var b_desc: BNNSNDArrayDescriptor
```

## Discussion

Discussion Bias is ordered as [num_layers][num_directions][hidden_size] (C style multi array notation).

## See Also

### Instance Properties

- [iw_desc](accelerate/bnnslstmgatedescriptor/iw_desc.md)
- [hw_desc](accelerate/bnnslstmgatedescriptor/hw_desc.md)
- [cw_desc](accelerate/bnnslstmgatedescriptor/cw_desc.md)
- [activation](accelerate/bnnslstmgatedescriptor/activation.md)