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

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

Returns a new permute layer.

## Declaration

```swift
convenience init?(input: BNNSNDArrayDescriptor, output: BNNSNDArrayDescriptor, permutation: [Int], filterParameters: BNNSFilterParameters? = nil)
```

## Parameters

- `input`: The descriptor of the input.
- `output`: The descriptor of the output.
- `permutation`: The array that defines the permutation.
- `filterParameters`: The filter runtime parameters.

## Discussion

Discussion important: The number of input dimensions must be equal to number of output dimensions.