---
title: "prelu(alpha:)"
framework: accelerate
role: symbol
role_heading: Instance Method
path: "accelerate/bnnsgraph/builder/tensor/prelu(alpha:)"
---

# prelu(alpha:)

Adds a Parametric ReLU (PReLU) activation operation to the current graph.

## Declaration

```swift
func prelu(alpha: [Float]) -> BNNSGraph.Builder.Tensor<T>
```

## Discussion

Discussion Performs the operation prelu(self) = max(0, self) + alpha[i] * min(0, self), for each channel i. self must have at least two dimensions. The number of elements in alpha must be either 1 or self.shape[1]. The operation applies the weight alpha[i] to channel i while performing the activation.