---
title: "init(input:output:alpha:filterParameters:)"
framework: accelerate
role: symbol
role_heading: Initializer
path: "accelerate/bnns/gramlayer/init(input:output:alpha:filterparameters:)"
---

# init(input:output:alpha:filterParameters:)

Returns a new Gram matrix layer.

## Declaration

```swift
convenience init?(input: BNNSNDArrayDescriptor, output: BNNSNDArrayDescriptor, alpha: Float, filterParameters: BNNSFilterParameters? = nil)
```

## Parameters

- `input`: The descriptor of the input.
- `output`: The descriptor of the output.
- `alpha`: A value to scale the result.
- `filterParameters`: The filter runtime parameters.