---
title: key
framework: accelerate
role: symbol
role_heading: Instance Property
path: accelerate/bnnslayerparametersmultiheadattention/key
---

# key

A projection parameter structure that describes the key-related input parameters and projection.

## Declaration

```swift
var key: BNNSMHAProjectionParameters
```

## See Also

### Instance Properties

- [query](accelerate/bnnslayerparametersmultiheadattention/query.md)
- [value](accelerate/bnnslayerparametersmultiheadattention/value.md)
- [add_zero_attn](accelerate/bnnslayerparametersmultiheadattention/add_zero_attn.md)
- [key_attn_bias](accelerate/bnnslayerparametersmultiheadattention/key_attn_bias.md)
- [value_attn_bias](accelerate/bnnslayerparametersmultiheadattention/value_attn_bias.md)
- [output](accelerate/bnnslayerparametersmultiheadattention/output.md)
- [dropout](accelerate/bnnslayerparametersmultiheadattention/dropout.md)
- [seed](accelerate/bnnslayerparametersmultiheadattention/seed.md)