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Choco Solver ChangeLog

This file is dedicated to sum up the new features added and bugs fixed in Choco-solver since the version, 4.0.0. Note: double-space is replaced by "\t" character on release process. Make sure the format is ok.

4.10.17 - 23 Sep 2024

Hotfix

  • Fix bug in PropHybridTable (#1102)

Full Changelog: https://github.com/chocoteam/choco-solver/compare/v4.10.16...v4.10.17

4.10.16 - 12 Sep 2024

Hotfix

  • Fix bug in IntAffineView (#1101)

Full Changelog: https://github.com/chocoteam/choco-solver/compare/v4.10.15...v4.10.16

4.10.15 - 09 Sep 2024

Major features:

  • Add PickOnDom and variants (see Search.pickOnDom)
  • Enhance MiniZinc output
  • Revamp scripts to solver flatzinc files
  • Fix bugs (see closed issues)

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

See milestone 4.10.15

Contributors to this release:

Full Changelog: https://github.com/chocoteam/choco-solver/compare/v4.10.14...v4.10.15

4.10.14 - 02 Nov 2023

Major features:

  • NEW: solver..showRestarts(); to display the number of restarts during the search.
  • NEW: hybrid table constraints (see model.table(...))
  • NEW: partial assignement generator for COP (see Search.generatePartialAssignment())
  • NEW: Add Blackbox configuration (#1058)
  • Revamp views (#564)
  • Improve pow(base, exponent, result)
  • Remove BitsetArrayIntVarImpl now managed in BitSetIntVarImpl

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

See milestone 4.10.14

Contributors to this release:

Full Changelog: https://github.com/chocoteam/choco-solver/compare/v4.10.13...v4.10.14

4.10.13 - 05 Jun 2023

Major features:

Mainly bug fixes and improvements of Pareto front performances.

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

See milestone 4.10.13

Contributors to this release:

4.10.12 - 06 Mar 2023

Major features:

  • Fix bug #1006, #1011 and #1014

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

See milestone 4.10.12

Contributors to this release:

4.10.11 - 07 Feb 2023

Major features:

  • Correcting the lack of filtering in PropIncreasing
  • Change the SetType for the undirected graph stored in DiffN for efficiency reason
  • SparseBitSet for a backtrackable bitset with mostly 0s (#935)
  • Change the way restarting works: not a Move anymore, directly included in Solver (#950)
  • Simplification of objective manager (#949)
  • Calling getValue() on an uninstantiated variable throws an IllegalStateException (#957)
  • Change the MiniZinc complementary search to a FirstFail (instead of DomOverWDeg) (#958)
  • Reduce object creation during solving (#985)
  • Reduce object creation during propagation (#969)
  • Reduce memory footprint of Model (#964)
  • Add model.getEstimatedMemory() method
  • Add Model analysis (#939)
  • Add log file as RegParser option (for parsers)
  • creation of PropPower propagators with exponent as int

Deprecated API (to be removed in next release):

From Solver:

  • Propagate getPropagate()
  • void setPropagate(Propagate p)
  • Closeable outputSearchTreeToCPProfiler(boolean domain)

Others:

  • Propagate class
  • IntEventType: int combine(IntEventType... evts)

Other closed issues and pull requests:

See milestone 4.10.11

Contributors to this release:

4.10.10 - 11 Oct 2022

Major features:

  • Fix performance issue of ViewDeltaMonitor
  • Fix lack of filtering in STR2+ when domain is bounded
  • Fix issue relative to OR and AND in LogOp
  • Add missing checks in OneWordS32BitSet and OneWordS64BitSet + update constructors
  • Add new API to VariableUtils
  • Add CITATION.cff
  • Update paper.md

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

See milestone 4.10.10

Contributors to this release:

4.10.9 - 22 Aug 2022

Major features:

  • It is now possible to declare hints to help the search finding a first solution. See solver.addHint(var, val).
  • Add Solver.tableSampling resolution policy which returns a stream of Solution randomly sampled.
  • Add increasing and decreasing constraints
  • Add costFlow constraint, which is composed of scalar products and a MinCostMaxFlow propagator
  • Revamp pow constraint
  • Add threshold for element with array of variables signature
  • Add a propagator for 0/1-knapsack (thanks to @PoltyPoltou)
  • Remove CPProfiler since the project is not active anymore.
  • Make possible to deal with large domains for some constraints (#894)
  • Add a LinearProgram class to deal with linear program (!) and a two-phase Simplex (not connected yet)
  • Fix bug related to delta in boolean views
  • Improvements relative to reified propagators
  • Change signature of AtLeastNValues
  • Record time to best in Measures(IMeasures measures) constructor

Change the way propagators are stored in variables to ease swapping (#889)

Each variable is in charge of scheduling its propagators. This impacts the way propagators are stored in a variable. Consequently, the getPropagators() and getPropagator(int) methods are deprecated, streamPropagators() replaces them. Unless otherwise stated, a propagator that can be entailed is automatically swapped in its variables' internal structure.

SetVar

  • Extend some black-box strategies to SetVar
  • Add union(SetVar unionSet, SetVar indices, SetVar[] sets) constraint
  • Add free strategy for SetVar (RegParser and ParallelPortfolio)
  • Fix SetVar#getDomainSize
  • Add SetDomainMax
  • Add 'setLe' and 'setLt' constraint (as a decomposition) in ISetConstraintFactory

Flatzinc, XCSP3 and MPS

  • Change default search of Flatzinc
  • Increase interval for Flatzinc unbounded intvar
  • Remove default ANSI in parsers
  • Update FZN grammar to deal with 'set of int'
  • Flatzinc: deal with warm_start
  • Add ignored search annotation warning in FGoal
  • Update XCSPParser + add model.amongDec

JAR Files

Since 4.10.9, a new jar file is available for download. This is a lighter version of the one with dependencies, namely choco-parsers-light-VERSION.jar. The following dependencies have been excluded from this archive:

  • org.apache.pdfbox:pdfbox
  • org.apache.fontbox:fontbox
  • com.ibm.icu:icu4j

This results in 82% smaller archive. Note that the non-alleged versions are still available for download.

Deprecated API (to be removed in next release):

  • IOutputFactory.outputSearchTreeToCPProfiler(boolean domain)

Other closed issues and pull requests:

See milestone 4.10.9

Contributors to this release:

4.10.8 - 07 Jan 2022

Major features:

  • Propagation is now observable, solver.observePropagation(PropagationObserver). Consequently, it is now possible to profil the propagation by calling solver.profilePropagation(). See Javadoc for details and usages (#832).
  • Release 4.10.7 introduces a bug related to delta monitors, which is now fixed (#837).
  • Add new black-box strategy: failure based variable ordering heuristics (@lihb905)
  • Add model.streamVars() and model.streamCstrs()
  • Bounded domains checking for table constraints
  • Change complementary search in FlatZincParser
  • Bump XCSP3

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

See milestone 4.10.8

Contributors to this release:

4.10.7 - 11 Oct 2021

Major features:

  • Simplify the way deltamonitors work. There is no need to freeze and unfreeze them before calling forEach... methods. But, a call to forEach... consumes all values stored.
  • Fix a bug related to incremental propagators, views and missing events.
  • STR2+ now deals with STAR tuples. Can be used when CT+ is not efficient (mainly due to very large domain size)
  • Resetting cutoff strategies now possible
  • Change restart behavior to reset cutoff on solutions (can be disabled though, calling solver.setRestarts(..) API).
  • Display occurrences of variable types and occurrences of propagator types
  • Now IntDomainBest offers API to break ties (see Search.ValH.BLAST for an example).
  • Add solver.defaultSolution() which creates lazily a solution recording everything, plugs it and returns it. This is helpful when a Solution object is required in many places.
  • Modification of the management of expressions in order to reduce the number of created variables (WIP).
  • Add IntVar.stream() that streams a variable's values (in increasing order)
  • Add Search.ValH.BMIN and Search.ValH.BLAST
  • Add DIMACS CNF parser (org.chocosolver.parser.mps.ChocoDIMACS)
  • Add Logger (solver.log()) to trace from Model/Solver.
  • Change some default settings
  • Revamp Settings, now is defined as a factory pattern + add Settings.dev() and Settings.prod() profiles.
  • Make half reification possible. Seed c.implies(b) or c.impliedBy(b) where c is a Constraint and b a BoolVar.
  • Update MiniZinc constraints definition + flatzinc files (for testing).
  • Update choco.msc (for MiniZinc IDE) + ./minizinc/README.md
  • Add Argmax and Argmin constraints
  • Add IfThenElse as a decomposed constraint
  • Improvement of solver.findParetoFront()

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

See milestone 4.10.7

Contributors to this release:

4.10.6 - 11 Dec 2020

Major features:

  • Add new resolution helper in Solver, namely findOptimalSolutionWithBounds. See Javadoc for details and usages.
  • ParallelPortfolio now allows to add unreliable models, that is models whose resolution is deliberately made incomplete. These models should not stop the parallel resolution process when they no longer find a solution. Only complete models can inform the portfolio that they have proven the full exploration of the search space.
  • Add org.chocosolver.util.tools.PreProcessing class, and a first preprocessing rule: equalities detection
  • Upgrade ibex integration to support ibex-java v1.2.0. Fixes for issues #653 and #740.
  • Add QuickXPlain algorithm to find the Minimum Conflicting Set (see issue #509)
  • Update XCSP3 parser.
  • Fix InDomainMedian when domain size is even
  • Add new way to watch solving: solver.verboseSolving()
  • Deal with annotations for some Flatzinc constraints (allDifferent and inverse)
  • Add MultiArmedBandit strategy sequencer

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

See milestone 4.10.6

Contributors to this release:

4.10.5 - 02 Oct 2020

Major features:

  • add IN arithmetic int expression.

Deprecated API (to be removed in next release):

  • Settings.enableACOnTernarySum() removed
  • Settings.setEnableACOnTernarySum(boolean) removed

Other closed issues and pull requests:

See milestone 4.10.5

Contributors to this release:

4.10.4 - 08 Sep 2020

Major features:

  • Change search strategies in ParallelPortfolio
  • Make "CT+" available to binary table constraint
  • Update Dockerfile, now automatically released in hub.docker.com
  • Migrate to ANTLR 4.8-1
  • Support nested seq_search in FlatZinc file
  • Add missing operations in model.unpost(c)
  • Add new constraint, named conditional, that posts constraints on condition
  • Merge cutoffseq in solver
  • Merge pf4cs in parsers
  • Remove geost from parsers

Deprecated API (to be removed in next release):

Other closed issues and pull requests:

#692, #698, #700, #702, #703, #704, #705

Contributors to this release:

4.10.3 - 03 Jul 2020

Multi-modules and JPMS-ready.

Major features:

  • Move cutoffseq, choco-sat, choco-solver, pf4cs, choco-parsers and samples projects into a (maven) multi-modules project, JPMS-ready

Additions

  • Add Conflict History Search ("Conflict history based search for constraint satisfaction problem." Habetand Terrioux,SAC 19 (#676)
  • Add dom/wdeg with refinement ("Refining Constraint Weighting." Wattez et al. ICTAI 2019.)
  • Default AC algorithm for AllDifferent is now from IJCAI-18 "A Fast Algorithm for Generalized Arc Consistency of the Alldifferent Constraint", Zhang et al. (#644)
  • Add a pure java alternative to Ibex (#666)
  • LNS can now be defined with a solution as bootstrap.
  • Add simplify API for current Solver operations (#659)
  • Simplify code for the nValues constraint (using a watching/witnessing reasoning) (#674)
  • Replace former Bin Packing propagators by Paul Shaw propagator (#671)
  • Improving PropDiffN performance (#663)
  • Add nogood stealing for ParallelPortfolio (#669)
  • Adding of new constructors for Task objects (#662)

Removals

  • Remove JSON writer/parser (which was actually partially supported and not maintained) (#664)

Deprecated API (to be removed in next release):

  • Task(IntVar s, IntVar d, IntVar e, boolean declareMonitor)
  • AbstractProblem.readArgs(String... args)

Other closed issues and pull requests:

#617, #633, #637, #639, #645, #646, #647, #648, #658, #665, #667, #678, #682, #686, #689, #691

4.10.2 - 14 Oct 2019

Major features:

  • fix issues relative to propagation
  • change constraints' status checking
  • change stop conditions in ExplanationForSignedClause
  • add stable module name

Closed issues and pull requests:

#618

4.10.1 - 26 Jun 2019

Major features:

  • LNS on other variables (e.g. SetVarLNS)
  • Continuous integration fixed
  • IntDomainMiddle now allows an external definition of what middle is, thanks to ToDoubleFunction<IntVar>

Deprecated API (to be removed in next release):

Closed issues and pull requests:

#538, #600, #611, #612, #613, #614, #615, #617, #619, #627, #630

4.10.0 - 12 Dec 2018

This release comes with several major modifications. The most important one is related to explanations. The previous framework is replaced by a new one based on "A Proof-Producing CSP Solver", M.Vesler and O.Strichman, AAI'10.

See notebooks for an example of use.

Major features:

  • Update statistic dashboard (see solver.showDashboard())
  • Fix Settings.load on missing property
  • Fix issue in Cumulative simplified API
  • Add additional views model.intEqView(x,c), model.intNeView(x,c), model.intLeView(x,c) and model.intGeView(x,c)
  • Detect when the same views is created twice on the same pair <variable, value?>
  • Revamp the way LNS' neighbor is declared (simplication)
  • Add AbstractStrategy.remove() method to remove a declared strategy and its dependencies
  • Add new strategies to Search
  • Add new decomposition to IDecompositionFactory
  • Improve initialization of CT+ and CT*
  • Improve IntVar#isInstantiatedTo(int)

Deprecated API (to be removed in next release):

  • INeighbor interface is deprecated and replaced by Neighbor abstract class
  • INeighborFactory#explanationBased(IntVar...) is deprecated, no replacement.
  • ILearnFactory#setCBJLearning(boolean,boolean) and ILearnFactory#setDBTLearning(boolean,boolean) are deprecated, see ILearnFactory#setLearningSignedClauses() instead

Closed issues and pull requests:

#604, #605, #606

4.0.9 - 30 Oct 2018

Minor release

Major features:

  • Offer possibility to store and load Settings from a property file.
  • Add API for cumulative when only starts are variable
  • Add decomposition of cumulative: model.cumulativeTimeDecomp(...)
  • Logical expression XOR manages more than 2 variables
  • Add new API to IOutputFactory (to Gephi and to Graphviz)
  • Add constraint network output (to gexf format), see solver.constraintNetworkToGephi(file)
  • add ParallelPortfolio.streamSolutions (#579)

Deprecated API (to be removed in next release):

Closed issues and pull requests:

#596, #600, #601, #602

4.0.8 - 23 Jul 2018

Update DefaultSettings with right version

4.0.7 - 19 Jul 2018

JAR file names have changed:

  • the suffix 'with-dependencies' disappears,
  • the suffix '-no-dep' (for no dependencies) appears.

This should intends to clarify the selection for new comers.

Add a PayPal button for donations.

Move to Ibex-2.6.5.

Major features:

  • Revamp Settings: no default method anymore, add setters. A concrete class DefaultSettings provides the default behavior.
  • IViewFactory.intScaleView now manages negative constants,
  • IViewFactory.intAffineView is now available
  • add new constraint for mixed linear equation (over real/int variables and double/int coefficients)
  • Dow/WDeg now manages variables in a bipartite set (instantiated variables are swaped)
  • Assert that a propagator that is passive is not allowed to filter anymore
  • An exception is thrown when a sum (or scalar) constraint is candidate for integer over/underflow (an alternative should be provided later)
  • BoolVar now handles modifications in different way (may impact performances)
  • Propagation engine has changed: no alternative to seven-queue one anymore + simplification of code (may impact performances)
  • add new relation expression ift(e1,e2)

Deprecated API (to be removed in next release):

  • Model.set(Settings) is deprecated. Now settings are declared in the Model constructor.
  • Settings.debugPropagation() is deprecated. There is no alternative.

Closed issues and pull requests:

#527, #564, #569, #576, #578, #581, #586

4.0.6 - 23 Nov 2017

Move to Ibex-2.6.3.

Major features:

  • Ibex instance is no longer static, that offers better stability and reduce memory consumption when adding/removing functions. Reification no longer managed by Choco but delegated to Ibex.
  • Search.realVarSearch(...) offers possibility to define minimal range size, known as epsilon
  • Search.ibexSolving(model) let Ibex iterates over solutions once all integer variables are instantiated
  • add detection of min/max sub-cases
  • add simple dashboard in Swing to show resolution statistics, see solver.showDashboard()

Deprecated API (to be removed in next release):

  • IntEqRealConstraint will be removed in next release, Ibex managed this concept (int to real)
  • Model.getIbex() should not be used. A IbexHandler manages Ibex instances (one per model).

Closed issues and pull requests:

#558, #561, #565, #566, #568, #570

4.0.5 - 28 Sep 2017

The current release was submitted to MiniZinc Challenge 2017 and at XCSP3 Competition 2017 and won medals.

choco-parsers provides utility to export a Model to JSON format and or import JSON data into a Model.

Major features:

  • Compact-Table now deals with short tuples (#531)
  • Checking if a created constraint is free (neither posted or reified) is now possible with Settings.checkDeclaredConstraints()
  • Improvements on BoolVarImpl and BoolNotView.
  • Remove code deprecated in last release.
  • Fix error in Views.
  • Add scalar detection in BiReExpression
  • fix errors in Impact-based Search
  • update Search.intVarSearch() + Search.defaultSearch(Model)
  • update ParallelPortfolio default strategies

Deprecated API (to be removed in next release):

Closed issues and pull requests:

  • fix bug in PropNogoods when dealing with negative values (impact solver..setNoGoodRecordingFromRestarts() and solver..setNoGoodRecordingFromSolutions(...))
  • fix bug in model.sum(...) and model.scalar(...) when dealing with arity greater than 100 and all operators except =
  • fix bug in model.table(...) with binary scope and universal value
  • fix bug related to Ibex and GC.

#531 ,#545, #546.

4.0.4 - 28 Apr 2017

Major features:

  • add logical operator to expression (#520). Now it is possible, f-ex., to declare expression like: x.eq(y.add(1)).or(x.eq(y).and(x.eq(1)))
  • add new API to Solver to print features in a single line
  • enable ignoring passivate propagators when iterating over propagators of a modified variable (false by default; see Settings)

Deprecated API (to be removed in next release):

  • IPropagationEngine.fails(c,v,m) is replaced by Solver.throwsException(c,v,m) (#524)
  • IPropagationEngine.getContradictionException() is replaced by Solver.getContradictionException() (#524)
  • MathUtils.bounds(values) is replaced by a call to MathUtils.min(values) and MathUtils.max(values)

Remove dead code:

  • SparseSet
  • IFeatures, Features, IAttribute and Attribute

Closed issues and pull requests:

#516, #517, #518, #519, #520, #521, #524.

4.0.3 - 31 Mar 2017

Major features:

  • arithm(IntVar,String,IntVar,String,int) and arithm(IntVar,String,IntVar,String,IntVar) manage '*' and '/'
  • add new APIs to ArrayUtils
  • fix error in PropBoolMin and PropBoolMax

Deprecated API:

Closed issues and pull requests:

#500, #502, #507, #510, #512, #514, #515.

4.0.2 - 20 Jan 2017

Major features:

  • restrict calls to Solver.setEngine(...) when propagation started. See javadoc for details.
  • remove global constructive disjunction, only local constructive disjunction is allowed.
  • add Solution.restore() to restore a solution (#354).
  • deep reset of Solver (#490, #491)

Deprecated API:

  • Solver.getState() (#485)
  • Measures.IN_SEC (related to #486)
  • Settings.outputWithANSIColors, IOutputFactory.ANSI_*
  • IMoveFactory.setLubyRestart(int, int, ICounter, int)

Closed issues and pull requests:

#468, #479, #480, #481, #484, #487, #488, #489, #492, #493, #494, #495, #496, #497, #499.

4.0.1 - 16 Dec 2016

4.0.0 - 13 Sep 2016