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  "identifier" : "/documentation/Accelerate/BNNS/applyActivation(activation:input:output:batchSize:filterParameters:)",
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# applyActivation(activation:input:output:batchSize:filterParameters:)

Applies the specified activation function.

```
static func applyActivation(activation: BNNS.ActivationFunction, input: BNNSNDArrayDescriptor, output: BNNSNDArrayDescriptor, batchSize: Int, filterParameters: BNNSFilterParameters? = nil) throws
```

## Parameters

`activation`

The activation that the function applies.

`input`

The descriptor of the input.

`output`

The descriptor of the output.

`batchSize`

The number of input-output pairs.

`filterParameters`

The filter runtime parameters.

---

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