0.5.0

0.5.0 - 2026-01-09

Added

• More statistics functions by @qwazer
• Fit accessors with Attribute

Changed

• Flag attributes are replaced with boolean attributes to properly support missing values
• Upgrade tensorflow version to 1.0.0

Removed

• Support for ND4J

0.4.2 - 2025-01-27

Added

• Convenient matrix builders for rows, columns, vstacks and hstacks
• Sparse matrix builder

Fixed

• Ojalgo conversion bug which made all converted matrices be zero.

0.4.1 - 2025-01-12

Added

• Metropolis-Hastings sampler
• Ojalgo LinearSpace implementation.

Changed

• attributes-kt moved to a separate project, and the version used is 0.3.0
• Kotlin 2.1. Now use cross-compilation to deploy macOS targets.
• Changed origin to cmMatrix in kmath-commons to avoid property name clash. Expose bidirectional conversion in CMLinearSpace
• (BREAKING CHANGE) Changed implementations in kmath-ejml to match CM and ojalgo style. Specifically, provide bidirectional conversion for library types.

Fixed

• (BREAKING CHANGE) Fix EJML to properly treat vectors as columns

0.4.0 - 2024-02-18

Added

• Reification. Explicit SafeType for algebras.
• Integer division algebras.
• Float32 geometries.
• New Attributes-kt module that could be used as stand-alone. It declares. type-safe attributes containers.
• Explicit mutableStructureND builders for mutable structures.
• Buffer.asList() zero-copy transformation.
• Wasm support.
• Parallel implementation of LinearSpace for Float64
• Parallel buffer factories

Changed

• Buffer copy removed from API (added as an extension).
• Default naming for algebra and buffers now uses IntXX/FloatXX notation instead of Java types.
• Remove unnecessary inlines in basic algebras.
• QuaternionField -> QuaternionAlgebra and does not implement Field anymore since it is non-commutative
• kmath-geometry is split into euclidean2d and euclidean3d
• Features replaced with Attributes.
• Transposed refactored.
• Kmath-memory is moved on top of core.

Deprecated

• ND4J engine

Removed

• asPolynomial function due to scope pollution
• Codegend for ejml (450 lines of codegen for 1000 lines of code is too much)

Fixed

• Median statistics
• Complex power of negative real numbers
• Add proper mutability for MutableBufferND rows and columns
• Generic Float32 and Float64 vectors are used in geometry algebras.

What's Changed

• Added Levenberg-Marquardt algorithm and svd Golub-Kahan by @margarita0303 in #513
• Update/Add copyright comments. Regenerate code for kmath-ejml. by @SPC-code in #522
• 0.4.0 by @SPC-code in #529
• Draft: STUD-7: Metropolis-Hastings sampler implementation by @Vasilev-Ilya in #533
• Move ND4J dependencies to libs.versions.toml, API dump in kmath-nd4j by @CommanderTvis in #535
• Add "min" and "max" statistics implemented as ExtremeValueStatistic by @qwazer in #541
• Fix transposed in mutlik algebra. by @SPC-code in #543

New Contributors

• @Vasilev-Ilya made their first contribution in #533

Full Changelog: v0.3.1...v0.5.0

0.3.1

Added

• Wasm support for memory, core, complex and functions modules.
• Generic builders for BufferND and MutableBufferND
• NamedMatrix - matrix with symbol-based indexing
• Expression with default arguments
• Type-aliases for numbers like Float64
• Autodiff for generic algebra elements in core!
• Algebra now has an obligatory bufferFactory (#477).

Changed

• Geometry uses type-safe angles
• Tensor operations switched to prefix notation
• Row-wise and column-wise ND shapes in the core
• Shape is read-only
• Major refactor of tensors (only minor API changes)
• Kotlin 1.8.20
• LazyStructure deffered -> async to comply with coroutines code style
• Default dot operation in tensor algebra no longer support broadcasting. Instead matmul operation is added to DoubleTensorAlgebra.
• Multik went MPP

Removed

• Trajectory moved to https://github.com/SciProgCentre/maps-kt
• Polynomials moved to https://github.com/SciProgCentre/kmath-polynomial

0.3.1-dev-RC

Added

• Wasm support for memory, core, complex and functions modules.
• Generic builders for BufferND and MutableBufferND
• NamedMatrix - matrix with symbol-based indexing
• Expression with default arguments
• Type-aliases for numbers like Float64
• Autodiff for generic algebra elements in core!
• Algebra now has an obligatory bufferFactory (#477).

Changed

• Geometry uses type-safe angles
• Tensor operations switched to prefix notation
• Row-wise and column-wise ND shapes in the core
• Shape is read-only
• Major refactor of tensors (only minor API changes)
• Kotlin 1.8.20
• LazyStructure deffered -> async to comply with coroutines code style
• Default dot operation in tensor algebra no longer support broadcasting. Instead matmul operation is added to DoubleTensorAlgebra.
• Multik went MPP

Removed

• Trajectory moved to https://github.com/SciProgCentre/maps-kt
• Polynomials moved to https://github.com/SciProgCentre/kmath-polynomial

0.3.0

Added

• ScaleOperations interface
• Field extends ScaleOperations
• Basic integration API
• Basic MPP distributions and samplers
• bindSymbolOrNull
• Blocking chains and Statistics
• Multiplatform integration
• Integration for any Field element
• Extended operations for ND4J fields
• Jupyter Notebook integration module (kmath-jupyter)
• @PerformancePitfall annotation to mark possibly slow API
• Unified architecture for Integration and Optimization using features.
• BigInt operation performance improvement and fixes by @zhelenskiy (#328)
• Integration between MST and Symja IExpr
• Complex power
• Separate methods for UInt, Int and Number powers. NaN safety.
• Tensorflow prototype
• ValueAndErrorField
• MST compilation to WASM: #286
• Jafama integration: #176
• contentEquals with tolerance: #364
• Compilation to TeX for MST: #254

Changed

• Exponential operations merged with hyperbolic functions
• Space is replaced by Group. Space is reserved for vector spaces.
• VectorSpace is now a vector space
• Buffer factories for primitives moved to MutableBuffer.Companion
• Rename NDStructure and NDAlgebra to StructureND and AlgebraND respectively
• Real -> Double
• DataSets are moved from functions to core
• Redesign advanced Chain API
• Redesign MST. Remove MstExpression.
• Move MST to core
• Separated benchmarks and examples
• Rewrite kmath-ejml without ejml-simple artifact, support sparse matrices
• Promote stability of kmath-ast and kmath-kotlingrad to EXPERIMENTAL.
• ColumnarData returns nullable column
• MST is made sealed interface
• Replace MST.Symbolic by Symbol, Symbol now implements MST
• Remove Any restriction on polynomials
• Add out variance to type parameters of StructureND and its implementations where possible
• Rename DifferentiableMstExpression to KotlingradExpression
• FeatureSet now accepts only Feature. It is possible to override keys and use interfaces.
• Use Symbol factory function instead of StringSymbol
• New discoverability pattern: <Type>.algebra.<nd/etc>
• Adjusted commons-math API for linear solvers to match conventions.
• Buffer algebra does not require size anymore
• Operations -> Ops
• Default Buffer and ND algebras are now Ops and lack neutral elements (0, 1) as well as algebra-level shapes.
• Tensor algebra takes read-only structures as input and inherits AlgebraND
• UnivariateDistribution renamed to Distribution1D
• Rework of histograms.
• UnivariateFunction -> Function1D, MultivariateFunction -> FunctionND

Deprecated

• Specialized DoubleBufferAlgebra

Removed

• Nearest in Domain. To be implemented in geometry package.
• Number multiplication and division in main Algebra chain
• contentEquals from Buffer. It moved to the companion.
• MSTExpression
• Expression algebra builders
• Complex and Quaternion no longer are elements.
• Second generic from DifferentiableExpression
• Algebra elements are completely removed. Use algebra contexts instead.

Fixed

• Ring inherits RingOperations, not GroupOperations
• Univariate histogram filling

0.3.0-dev-18

Added

• ScaleOperations interface
• Field extends ScaleOperations
• Basic integration API
• Basic MPP distributions and samplers
• bindSymbolOrNull
• Blocking chains and Statistics
• Multiplatform integration
• Integration for any Field element
• Extended operations for ND4J fields
• Jupyter Notebook integration module (kmath-jupyter)
• @PerformancePitfall annotation to mark possibly slow API
• Unified architecture for Integration and Optimization using features.
• BigInt operation performance improvement and fixes by @zhelenskiy (#328)
• Integration between MST and Symja IExpr
• Complex power
• Separate methods for UInt, Int and Number powers. NaN safety.
• Tensorflow prototype

Changed

• Exponential operations merged with hyperbolic functions
• Space is replaced by Group. Space is reserved for vector spaces.
• VectorSpace is now a vector space
• Buffer factories for primitives moved to MutableBuffer.Companion
• Rename NDStructure and NDAlgebra to StructureND and AlgebraND respectively
• Real -> Double
• DataSets are moved from functions to core
• Redesign advanced Chain API
• Redesign MST. Remove MstExpression.
• Move MST to core
• Separated benchmarks and examples
• Rewrite kmath-ejml without ejml-simple artifact, support sparse matrices
• Promote stability of kmath-ast and kmath-kotlingrad to EXPERIMENTAL.
• ColumnarData returns nullable column
• MST is made sealed interface
• Replace MST.Symbolic by Symbol, Symbol now implements MST
• Remove Any restriction on polynomials
• Add out variance to type parameters of StructureND and its implementations where possible
• Rename DifferentiableMstExpression to KotlingradExpression
• FeatureSet now accepts only Feature. It is possible to override keys and use interfaces.
• Use Symbol factory function instead of StringSymbol
• New discoverability pattern: <Type>.algebra.<nd/etc>
• Adjusted commons-math API for linear solvers to match conventions.
• Buffer algebra does not require size anymore
• Operations -> Ops
• Default Buffer and ND algebras are now Ops and lack neutral elements (0, 1) as well as algebra-level shapes.
• Tensor algebra takes read-only structures as input and inherits AlgebraND

Deprecated

• Specialized DoubleBufferAlgebra

Removed

• Nearest in Domain. To be implemented in geometry package.
• Number multiplication and division in main Algebra chain
• contentEquals from Buffer. It moved to the companion.
• MSTExpression
• Expression algebra builders
• Complex and Quaternion no longer are elements.
• Second generic from DifferentiableExpression
• Algebra elements are completely removed. Use algebra contexts instead.

Fixed

• Ring inherits RingOperations, not GroupOperations
• Univariate histogram filling

0.3.0-dev-8

Added

• ScaleOperations interface
• Field extends ScaleOperations
• Basic integration API
• Basic MPP distributions and samplers
• bindSymbolOrNull
• Blocking chains and Statistics
• Multiplatform integration
• Integration for any Field element
• Extended operations for ND4J fields
• Jupyter Notebook integration module (kmath-jupyter)

Changed

• Exponential operations merged with hyperbolic functions
• Space is replaced by Group. Space is reserved for vector spaces.
• VectorSpace is now a vector space
• Buffer factories for primitives moved to MutableBuffer.Companion
• NDStructure and NDAlgebra to StructureND and AlgebraND respectively
• Real -> Double
• DataSets are moved from functions to core
• Redesign advanced Chain API
• Redesign MST. Remove MSTExpression.
• Move MST to core
• Separated benchmarks and examples
• Rewritten EJML module without ejml-simple

Deprecated

Removed

• Nearest in Domain. To be implemented in geometry package.
• Number multiplication and division in main Algebra chain
• contentEquals from Buffer. It moved to the companion.
• MSTExpression
• Expression algebra builders
• Comples and Quaternion no longer are elements.

Fixed

• Ring inherits RingOperations, not GroupOperations

0.2.0

[0.2.0]

Added

• fun annotation for SAM interfaces in library
• Explicit public visibility for all public APIs
• Better trigonometric and hyperbolic functions for AutoDiffField (#140)
• Automatic README generation for features (#139)
• Native support for memory, core and dimensions
• kmath-ejml to supply EJML SimpleMatrix wrapper (#136)
• A separate Symbol entity, which is used for global unbound symbol.
• A Symbol indexing scope.
• Basic optimization API for Commons-math.
• Chi squared optimization for array-like data in CM
• Fitting utility object in prob/stat
• ND4J support module submitting NDStructure and NDAlgebra over INDArray
• Coroutine-deterministic Monte-Carlo scope with a random number generator
• Some minor utilities to kmath-for-real
• Generic operation result parameter to MatrixContext
• New MatrixFeature interfaces for matrix decompositions
• Basic Quaternion vector support in kmath-complex.

Changed

• Package changed from scientifik to space.kscience
• Gradle version: 6.6 -> 6.8.2
• Minor exceptions refactor (throwing IllegalArgumentException by argument checks instead of IllegalStateException)
• Polynomial secondary constructor made function
• Kotlin version: 1.3.72 -> 1.4.30
• kmath-ast doesn't depend on heavy kotlin-reflect library
• Full autodiff refactoring based on Symbol
• kmath-prob renamed to kmath-stat
• Grid generators moved to kmath-for-real
• Use Point<Double> instead of specialized type in kmath-for-real
• Optimized dot product for buffer matrices moved to kmath-for-real
• EjmlMatrix context is an object
• Matrix LUP inverse renamed to inverseWithLup
• NumericAlgebra moved outside of regular algebra chain (Ring no longer implements it).
• Features moved to NDStructure and became transparent.
• Capitalization of LUP in many names changed to Lup.
• Refactored NDStructure algebra to be more simple, preferring under-the-hood conversion to explicit NDStructure types
• Refactor histograms. They are marked as prototype
• Complex and related features moved to a separate module kmath-complex
• Refactor AlgebraElement
• symbol method in Algebra renamed to bindSymbol to avoid ambiguity
• Add out projection to Buffer generic

Deprecated

Removed

• kmath-koma module because it doesn't support Kotlin 1.4.
• Support of legacy JS backend (we will support only IR)
• toGrid method.
• Public visibility of BufferAccessor2D
• Real class

Fixed

• symbol method in MstExtendedField (#140)

0.2.0-dev-5

Added

• fun annotation for SAM interfaces in library
• Explicit public visibility for all public APIs
• Better trigonometric and hyperbolic functions for AutoDiffField (#140)
• Automatic README generation for features (#139)
• Native support for memory, core and dimensions
• kmath-ejml to supply EJML SimpleMatrix wrapper (#136)
• A separate Symbol entity, which is used for global unbound symbol.
• A Symbol indexing scope.
• Basic optimization API for Commons-math.
• Chi squared optimization for array-like data in CM
• Fitting utility object in prob/stat
• ND4J support module submitting NDStructure and NDAlgebra over INDArray
• Coroutine-deterministic Monte-Carlo scope with a random number generator
• Some minor utilities to kmath-for-real
• Generic operation result parameter to MatrixContext
• New MatrixFeature interfaces for matrix decompositions

Changed

• Package changed from scientifik to kscience.kmath
• Gradle version: 6.6 -> 6.8
• Minor exceptions refactor (throwing IllegalArgumentException by argument checks instead of IllegalStateException)
• Polynomial secondary constructor made function
• Kotlin version: 1.3.72 -> 1.4.21
• kmath-ast doesn't depend on heavy kotlin-reflect library
• Full autodiff refactoring based on Symbol
• kmath-prob renamed to kmath-stat
• Grid generators moved to kmath-for-real
• Use Point<Double> instead of specialized type in kmath-for-real
• Optimized dot product for buffer matrices moved to kmath-for-real
• EjmlMatrix context is an object
• Matrix LUP inverse renamed to inverseWithLUP
• NumericAlgebra moved outside of regular algebra chain (Ring no longer implements it).
• Features moved to NDStructure and became transparent.

Deprecated

Removed

• kmath-koma module because it doesn't support Kotlin 1.4.
• Support of legacy JS backend (we will support only IR)
• toGrid method.
• Public visibility of BufferAccessor2D

Fixed

• symbol method in MstExtendedField (#140)

Security

0.2.0-dev-2

Added

• fun annotation for SAM interfaces in library
• Explicit public visibility for all public APIs
• Better trigonometric and hyperbolic functions for AutoDiffField (#140).
• Automatic README generation for features (#139)

Changed

• Package changed from scientifik to kscience.kmath.
• Gradle version: 6.6 -> 6.6.1
• Minor exceptions refactor (throwing IllegalArgumentException by argument checks instead of IllegalStateException)
• Polynomial secondary constructor made function.
• Kotlin version: 1.3.72 -> 1.4.20-M1

Deprecated

Removed

• kmath-koma module because it doesn't support Kotlin 1.4.

Fixed

• symbol method in MstExtendedField (#140)

0.1.4

Added

• Functional Expressions API
• Mathematical Syntax Tree, its interpreter and API
• String to MST parser (#120)
• MST to JVM bytecode translator (#94)
• FloatBuffer (specialized MutableBuffer over FloatArray)
• FlaggedBuffer to associate primitive numbers buffer with flags (to mark values infinite or missing, etc.)
• Specialized builder functions for all primitive buffers like IntBuffer(25) { it + 1 } (#125)
• Interface NumericAlgebra where number operation is available to convert numbers to algebraic elements
• Inverse trigonometric functions support in ExtendedField (asin, acos, atan) (#114)
• New space extensions: average and averageWith
• Local coding conventions
• Geometric Domains API in kmath-core
• Blocking chains in kmath-coroutines
• Full hyperbolic functions support and default implementations within ExtendedField
• Norm support for Complex

Changed

• readAsMemory now has throws IOException in JVM signature.
• Several functions taking functional types were made inline.
• Several functions taking functional types now have callsInPlace contracts.
• BigInteger and BigDecimal algebra: JBigDecimalField has companion object with default math context; minor optimizations
• power(T, Int) extension function has preconditions and supports Field<T>
• Memory objects have more preconditions (overflow checking)
• tg function is renamed to tan (#114)
• Gradle version: 6.3 -> 6.6
• Moved probability distributions to commons-rng and to kmath-prob

Fixed

• Missing copy method in Memory implementation on JS (#106)
• D3.dim value in kmath-dimensions
• Multiplication in integer rings in kmath-core (#101)
• Commons RNG compatibility (#93)
• Multiplication of BigInt by scalar