<!--
{
  "availability" : [
    "*: -",
    "iOS: 14.0.0 -",
    "iPadOS: 14.0.0 -",
    "macCatalyst: -",
    "macOS: 11.0.0 -",
    "tvOS: 14.0.0 -",
    "visionOS: -",
    "watchOS: 7.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Accelerate",
  "identifier" : "/documentation/Accelerate/BNNS/PaddingLayer/init(input:output:mode:size:filterParameters:)",
  "metadataVersion" : "0.1.0",
  "role" : "Initializer",
  "symbol" : {
    "kind" : "Initializer",
    "modules" : [
      "Accelerate"
    ],
    "preciseIdentifier" : "s:10Accelerate4BNNSO12PaddingLayerC5input6output4mode4size16filterParametersAESgSo21BNNSNDArrayDescriptora_AmC0C4ModeOSaySi1x_Si1ytGSo010BNNSFilterJ0aSgtcfc"
  },
  "title" : "init(input:output:mode:size:filterParameters:)"
}
-->

# init(input:output:mode:size:filterParameters:)

Returns a new padding layer.

```
convenience init?(input: BNNSNDArrayDescriptor, output: BNNSNDArrayDescriptor, mode: BNNS.PaddingMode, size: [(x: Int, y: Int)], filterParameters: BNNSFilterParameters? = nil)
```

## Parameters

`input`

The descriptor of the input.

`output`

The descriptor of the output.

`mode`

The mode the operation uses to pad.

`size`

The number of padding elements to add before and after the original data.

`filterParameters`

The filter runtime parameters.

## Discussion

> Important:
> Padding isn’t supported beyond 4D tensors.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)