---
title: MPSCNNLoss
framework: metalperformanceshaders
role: symbol
role_heading: Class
path: metalperformanceshaders/mpscnnloss
---

# MPSCNNLoss

A kernel that computes the loss and loss gradient between specified predictions and labels.

## Declaration

```swift
class MPSCNNLoss
```

## Topics

### Initializers

- [init(coder:device:)](metalperformanceshaders/mpscnnloss/init(coder:device:).md)
- [init(device:lossDescriptor:)](metalperformanceshaders/mpscnnloss/init(device:lossdescriptor:).md)

### Instance Properties

- [delta](metalperformanceshaders/mpscnnloss/delta.md)
- [epsilon](metalperformanceshaders/mpscnnloss/epsilon.md)
- [labelSmoothing](metalperformanceshaders/mpscnnloss/labelsmoothing.md)
- [lossType](metalperformanceshaders/mpscnnloss/losstype.md)
- [numberOfClasses](metalperformanceshaders/mpscnnloss/numberofclasses.md)
- [reduceAcrossBatch](metalperformanceshaders/mpscnnloss/reduceacrossbatch.md)
- [reductionType](metalperformanceshaders/mpscnnloss/reductiontype.md)
- [weight](metalperformanceshaders/mpscnnloss/weight.md)

### Instance Methods

- [encode(commandBuffer:sourceImage:labels:)](metalperformanceshaders/mpscnnloss/encode(commandbuffer:sourceimage:labels:).md)
- [encode(commandBuffer:sourceImage:labels:destinationImage:)](metalperformanceshaders/mpscnnloss/encode(commandbuffer:sourceimage:labels:destinationimage:).md)
- [encode(commandBuffer:sourceImages:labels:)](metalperformanceshaders/mpscnnloss/encode(commandbuffer:sourceimages:labels:).md)
- [encode(commandBuffer:sourceImages:labels:destinationImages:)](metalperformanceshaders/mpscnnloss/encode(commandbuffer:sourceimages:labels:destinationimages:).md)

## Relationships

### Inherits From

- [MPSCNNKernel](metalperformanceshaders/mpscnnkernel.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)

## See Also

### Loss Layers

- [MPSCNNLossDataDescriptor](metalperformanceshaders/mpscnnlossdatadescriptor.md)
- [MPSCNNLossDescriptor](metalperformanceshaders/mpscnnlossdescriptor.md)
- [MPSCNNLossLabels](metalperformanceshaders/mpscnnlosslabels.md)
- [MPSCNNYOLOLoss](metalperformanceshaders/mpscnnyololoss.md)
- [MPSCNNYOLOLossDescriptor](metalperformanceshaders/mpscnnyololossdescriptor.md)