<!--
{
  "documentType" : "article",
  "framework" : "LatentSemanticMapping",
  "identifier" : "/documentation/LatentSemanticMapping/map-properties",
  "metadataVersion" : "0.1.0",
  "role" : "collectionGroup",
  "title" : "Map Properties"
}
-->

# Map Properties

Special properties that determine a map’s behavior.

## Discussion

Latent Semantic Mapping interprets the following keys. All other keys starting with `LSM` are reserved.

## Topics

### Properties

[`var kLSMAlgorithmKey: String`](/documentation/LatentSemanticMapping/kLSMAlgorithmKey)

A key that specifies which algorithm to use.

[`var kLSMAlgorithmDense: String`](/documentation/LatentSemanticMapping/kLSMAlgorithmDense)

A value that specifies to perform a singular value decomposition (SVD) on a dense matrix.

[`var kLSMAlgorithmSparse: String`](/documentation/LatentSemanticMapping/kLSMAlgorithmSparse)

A value that specifies to perform a singular value decomposition (SVD) on a sparse matrix.

[`var kLSMPrecisionKey: String`](/documentation/LatentSemanticMapping/kLSMPrecisionKey)

A key that specifies the precision to use.

[`var kLSMPrecisionFloat: String`](/documentation/LatentSemanticMapping/kLSMPrecisionFloat)

A value that specifies to use float arithmetic.

[`var kLSMPrecisionDouble: String`](/documentation/LatentSemanticMapping/kLSMPrecisionDouble)

A value that specifies to use double arithmetic.

[`var kLSMDimensionKey: String`](/documentation/LatentSemanticMapping/kLSMDimensionKey)

A key that specifies the number of singular values to compute.

[`var kLSMIterationsKey: String`](/documentation/LatentSemanticMapping/kLSMIterationsKey)

A key that specifies the number of iterations to compute.

[`var kLSMSweepAgeKey: String`](/documentation/LatentSemanticMapping/kLSMSweepAgeKey)

A key that specifies the number of days between sweeping generations.

[`var kLSMSweepCutoffKey: String`](/documentation/LatentSemanticMapping/kLSMSweepCutoffKey)

A key that specifies the minimum count to keep entry.


---

Copyright &copy; 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)