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# BNNS.TernaryArithmeticLayer

A layer object that wraps a ternary arithmetic filter and manages its deinitialization.

```
class TernaryArithmeticLayer
```

## Topics

### Creating a Ternary Arithmetic Layer

[`convenience init?(inputA: BNNSNDArrayDescriptor, inputADescriptorType: BNNS.DescriptorType, inputB: BNNSNDArrayDescriptor, inputBDescriptorType: BNNS.DescriptorType, inputC: BNNSNDArrayDescriptor, inputCDescriptorType: BNNS.DescriptorType, output: BNNSNDArrayDescriptor, outputDescriptorType: BNNS.DescriptorType, function: BNNS.ArithmeticTernaryFunction, activation: BNNS.ActivationFunction, filterParameters: BNNSFilterParameters?)`](/documentation/Accelerate/BNNS/TernaryArithmeticLayer/init(inputA:inputADescriptorType:inputB:inputBDescriptorType:inputC:inputCDescriptorType:output:outputDescriptorType:function:activation:filterParameters:))

Returns a new ternary arithmetic layer.

### Specifying a Ternary Arithmetic Function

[`enum ArithmeticTernaryFunction`](/documentation/Accelerate/BNNS/ArithmeticTernaryFunction)

Constants that describe ternary arithmetic functions.

### Specifying a Descriptor Type

[`enum DescriptorType`](/documentation/Accelerate/BNNS/DescriptorType)

Constants that describe the input and output types of an arithmetic operation.

### Applying a Ternary Arithmetic Layer

[`func apply(batchSize: Int, inputA: BNNSNDArrayDescriptor, inputB: BNNSNDArrayDescriptor, inputC: BNNSNDArrayDescriptor, output: BNNSNDArrayDescriptor) throws`](/documentation/Accelerate/BNNS/TernaryArithmeticLayer/apply(batchSize:inputA:inputB:inputC:output:))

Applies the layer to a set of input array descriptors, writing the result to a set of output array descriptors.

[`func applyBackward(batchSize: Int, inputA: BNNSNDArrayDescriptor, inputB: BNNSNDArrayDescriptor, inputC: BNNSNDArrayDescriptor, output: BNNSNDArrayDescriptor, outputGradient: BNNSNDArrayDescriptor, generatingInputAGradient: BNNSNDArrayDescriptor, generatingInputBGradient: BNNSNDArrayDescriptor, generatingInputCGradient: BNNSNDArrayDescriptor) throws`](/documentation/Accelerate/BNNS/TernaryArithmeticLayer/applyBackward(batchSize:inputA:inputB:inputC:output:outputGradient:generatingInputAGradient:generatingInputBGradient:generatingInputCGradient:))

Applies the layer backward to generate input gradients.

## Relationships

### Inherits From

[`Layer`](/documentation/Accelerate/BNNS/Layer)

---

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