---
title: sinksTensor
framework: metalperformanceshadersgraph
role: symbol
role_heading: Instance Property
path: metalperformanceshadersgraph/mpsgraphsdpadescriptor/sinkstensor
---

# sinksTensor

An optional attention-sinks tensor of shape [nHeads]. Each element seeds the online-softmax accumulator for the corresponding query head with a virtual token logit, causing real-token attention weights to sum to less than one.

## Declaration

```swift
var sinksTensor: MPSGraphTensor? { get set }
```