---
title: kernelSizes
framework: metalperformanceshadersgraph
role: symbol
role_heading: Instance Property
path: metalperformanceshadersgraph/mpsgraphpooling4dopdescriptor/kernelsizes
---

# kernelSizes

Defines the pooling window size.

## Declaration

```swift
var kernelSizes: [NSNumber] { get set }
```

## Discussion

Discussion Must be four numbers, one for each spatial dimension, fastest running index last.