# MetalPerformanceShaders Data Types ## Topics ### Data Types [`typealias MPSAccelerationStructureCompletionHandler`](/documentation/MetalPerformanceShaders/MPSAccelerationStructureCompletionHandler) A block of code that’s invoked when an operation on an acceleration structure has completed. [`typealias MPSAxisAlignedBoundingBox`](/documentation/MetalPerformanceShaders/MPSAxisAlignedBoundingBox-swift.typealias) An axis-aligned bounding box. [`typedef NSArray MPSCNNArithmeticGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSCNNArithmeticGradientStateBatch) A batch of arithmetic gradient state instances. [`typedef NSArray MPSCNNConvolutionGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSCNNConvolutionGradientStateBatch) A batch of convolution gradient state instances. [`typedef NSArray MPSCNNConvolutionTransposeGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSCNNConvolutionTransposeGradientStateBatch) [`typedef NSArray MPSCNNDropoutGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSCNNDropoutGradientStateBatch) A batch of dropout gradient state instances. [`typedef NSArray MPSCNNGroupNormalizationGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSCNNGroupNormalizationGradientStateBatch) [`typedef NSArray MPSCNNInstanceNormalizationGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSCNNInstanceNormalizationGradientStateBatch) A batch of instance normalization gradient state instances. [`typedef NSArray MPSCNNLossLabelsBatch;`](/documentation/MetalPerformanceShaders/MPSCNNLossLabelsBatch) A batch of loss labels instances. [`typealias MPSDeviceCaps`](/documentation/MetalPerformanceShaders/MPSDeviceCaps) [`typealias MPSFunctionConstant`](/documentation/MetalPerformanceShaders/MPSFunctionConstant) [`typealias MPSFunctionConstantInMetal`](/documentation/MetalPerformanceShaders/MPSFunctionConstantInMetal) [`typealias MPSGradientNodeBlock`](/documentation/MetalPerformanceShaders/MPSGradientNodeBlock) [`typedef NSArray MPSImageBatch;`](/documentation/MetalPerformanceShaders/MPSImageBatch) A batch of Metal Performance Shader image instances. [`typedef NSArray MPSNNBinaryGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSNNBinaryGradientStateBatch) A batch of binary gradient state instances. [`typedef NSArray MPSNNGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSNNGradientStateBatch) A batch of gradient state instances. [`typedef NSArray MPSNNMultiaryGradientStateBatch;`](/documentation/MetalPerformanceShaders/MPSNNMultiaryGradientStateBatch) [`typedef NSArray MPSShape;`](/documentation/MetalPerformanceShaders/MPSShape) [`typedef NSArray MPSStateBatch;`](/documentation/MetalPerformanceShaders/MPSStateBatch) A batch of Metal Performance Shader state instances. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)