v1.11.1

• Bug fixes in conditional probabilities computation with the (recent) bisection method.
• Sound value iteration diagnostics in debug mode are more robust.
• Improved support for ARM.
• Support for musl libc.
• Code quality fixes (reduced warnings)

v1.11.0

• Completely restructured CMake build process:
  • Storm can now be properly installed.
  • Carl-storm is now automatically fetched from a predefined repository and tag. Use CMake option -DFETCHCONTENT_SOURCE_DIR_CARL=<path_to_carl> to set a local path.
• Improved support for interval models, especially parsing support for Prism models with intervals and CLI support for interval models.
• Support for discounted properties in DTMCs and MDPs.
• Added guessing value iteration.
• Support exporting schedulers for multi-objective properties.
• Revised implementation of conditional probabilities for MDPs.
• Added building of choice labels for Jani.
• Support time limits for the Gurobi LP Solver.
• Various fixes in DRN parser, BitVector, (negative) expected rewards, parsing of PDEP and for compiler warnings.
• Updated dependencies: carl-storm, gmm, googletest, l3pp, spot.
• Removed support for Intel TBB.
• Developer: Replaced GmmxxMultiplier by ViOperatorMultiplier.
• Developer: Added CI workflow for new releases.

v1.10.0

• Improved LpMinMaxLinearEquationSolver, set relevant values in topological solvers.
• Speed up of MEC decomposition by adjusting loops.
• Minor improvements for steady-state properties.
• Improved access to state valuations.
• Improved parsing: detect and handle integer overflows in expression parsing, and handle irrational probability expressions.
• Limit Sylvan threads to 1 on Apple Silicon.
• Bug fixes in computation of cumulative rewards, transient variables in JANI, SMGs with non-synchronizing but labeled actions, in SparseCbAchievabilityQuery and PcaaWeightVectorChecker.
• Updated shipped dependencies: Eigen, ExprTk, Spot.
• storm-dft: Set BDD variable ordering for SFT from file.
• storm-dft: Warning on potential modeling issues.
• storm-dft: Bug fixes in DFT representant computation and failable elements.
• storm-pars: Bug fixes in monotonicity computation.
• storm-pomdp: Added cut-off memory node information.
• storm-pomdp: Extended handling of terminal states.
• storm-pomdp: Improved output.
• Developer: Require at least CMake version 3.22.
• Developer: Revised includes.
• Developer: GLPK is optional.
• Developer: BitVector conforms to std::ranges::range concept.
• Developer: Improved CI tests and added builds on macOS.

v1.9.0

• Improved expected visiting times (EVTs) and steady state distribution computations.
• Support for interval-based models.
• Robust VI.
• Significantly improved compilation times.
• Support for logarithm expressions in PRISM and JANI.
• Support for sin and cos operators, and PI and Euler constants in JANI parser.
• Extraction of schedulers for minimal expected total rewards.
• More efficient MEC and SCC decompositions.
• Revised LP encoding for multi-objective verification under simple strategies.
• Added CLI option --permute to re-order the states after building.
• Added CLI option --build:state limit <number> to limit the number of explored states.
• Print all linked libraries when using --version.
• Removed support for HyPro and Cuda.
• Moved gamebased-ar to own library.
• Various bug fixes.
• storm-conv: Removed option --stdout.
• storm-dft: Fixes and improvements for DFT symmetries and DFT simulation.
• storm-pars: Completely reworked the command-line interface (and partially the C++ API).
• storm-pars: "Time travelling" optimization.
• storm-pgcl: Removed the library.
• Developer: Require at least CMake version 3.15.
• Developer: Moved storm-config.h.in into src directory.
• Developer: Use various Dockerfiles in CI.
• Developer: Revised includes and use pre-compiled headers.
• Developer: Fixed various compiler warnings.

v1.8.1

Workaround for issue with Boost >= 1.81

v1.8.0

• Revised implementation of value iteration algorithms and its variants, fixing a bug in the optimistic value iteration heuristic.
• Experimental support for compiling on Apple Silicon.
• Added SoPlex as a possible LP solver.
• Upgraded shipped version of sylvan.
• Upgraded repo / version for carl (for polynomials), requires carl-storm in at least version 14.23.
• Removed support for just-in-time compilation (JIT). If the JIT engine is needed, use Storm version 1.7.0.
• storm-dft: better modularization: improved algorithm for finding independent modules and revised the DFT analysis via modularization.
• storm-dft: added checks whether a given DFT is well-formed and conventional.
• storm-pomdp: streamlined implementation for quantitative analysis.
• storm-pomdp: added clipping for POMDP under-approximation.
• storm-pomdp: added API for interactive exploration of belief MDPs.
• Developer: Introduced forward declarations (in their own headers), in particular for storm::RationalNumber, storm::RationalFunction, and storm::json.
• Developer: LpSolver interface now supports RawMode (to avoid overhead of storm::expression) and indicator constraints.

v1.7.0

• Fixed a bug in LP-based MDP model checking.
• DRN Parser is now more robust, e.g., it does no longer depend on tabs.
• PRISM Parser: Modulo with negative numbers is now consistent with Prism.
• Added lexicographic multi-objective model checking. Use --lex in the command line interface when specifying a multi(...) property.
• Fix handling duplicate entries in the sparse matrix builder.
• Added support for step-bounded until formulas in LTL.
• Added Dockerfile.
• API: Applying a fully defined deterministic memoryless scheduler to an MDP yields a DTMC.
• storm-dft: Use dedicated namespace storm::dft.
• storm-dft: Added support (parsing, export, BDD analysis) for additional BE failure distributions (Erlang, log-normal, Weibull, constant probability).
• storm-dft: Added instantiator for parametric DFT.
• Developer: Storm is now built in C++17 mode.
• Developer: Added support for automatic code formatting for storm-dft.

v1.6.4

• Added support for model checking LTL properties in the sparse (and dd-to-sparse) engine. Requires building with Spot or an external LTL to deterministic automaton converter (using option --ltl2datool).
• Added cmake options STORM_USE_SPOT_SYSTEM and STORM_USE_SPOT_SHIPPED to facilitate building Storm with Spot.
• Improved parsing of formulas in PRISM-style syntax.
• Added export of schedulers that use memory (in particular optimizing schedulers for LTL properties)
• Added support for PRISM models that use unbounded integer variables.
• Added support for nested arrays in JANI.
• Added --location-elimination that can be applied to Jani DTMC models to reduce the size of the resulting Markov models, see here.
• Added an export of check results to json. Use --exportresult in the command line interface.
• Added --exportbuilt option that exports the built model in various formats. Deprecates --io:exportexplicit, --io:exportdd and --io:exportdot
• Added export of built model in .json. which can be used to debug and explore the model.
• Added computation of steady state probabilities for DTMC/CTMC in the sparse engine. Use --steadystate in the command line interface.
• Added computation of the expected number of times each state in a DTMC/CTMC is visited (sparse engine). Use --expvisittimes in the command line interface.
• Implemented parsing and model building of Stochastic multiplayer games (SMGs) in the PRISM language. No model checking implemented (yet).
• API: Simulation of prism-models
• API: Model-builder takes a callback function to prevent extension of particular actions, prism-to-explicit mapping can be exported
• API: Export of dice-formatted expressions
• Prism-language/explicit builder: Allow action names in commands writing to global variables if these (clearly) do not conflict with assignments of synchronizing commands.
• Prism-language: n-ary predicates are supported (e.g., ExactlyOneOf)
• Added support for continuous integration with Github Actions.
• storm-pars: Exploit monotonicity for computing extremal values and parameter space partitioning.
• storm-dft: Support for analysis of static fault trees via BDDs (Flag --bdd). In particular, efficient computation of multiple time bounds was added and support for several importance measures (Argument --importance).
• storm-dft: Computation of minimal cut sets for static fault trees (Flag --mcs).
• storm-dft: Improved modularisation for DFT by exploiting SFT analysis via BDDs.
• storm-dft: Fixed don't care propagation for shared SPAREs which resulted in wrong results.
• Developer: Added support for automatic code formatting and corresponding CI workflow.

v1.6.3

• Added support for multi-objective model checking of long-run average objectives including mixtures with other kinds of objectives.
• Added support for generating optimal schedulers for globally formulae
• Simulator supports exact arithmetic
• Added switch --no-simplify to disable simplification of PRISM programs (which sometimes costs a bit of time on extremely large inputs)
• Fixed issues with JANI inputs concerning
  • transient variable expressions in properties,
  • constants in properties, and
  • integer variables with either only an upper or only a lower bound.
• storm-pomdp: States can be labelled with values for observable predicates
• storm-pomdp: (Only API) Track state estimates
• storm-pomdp: (Only API) Reduce computation of state estimates to computation on unrolled MDP

v1.6.2

• Prism program simplification improved.
• Revamped implementation of long-run-average algorithms, including scheduler export for LRA properties on Markov automata.
• Support for step-bounded properties of the form ... [F[x,y] ... ] for DTMCs and MDPs (sparse engine).
• Renamed portfolio engine to automatic
• storm-dft: Fix for relevant events when using symmetry reduction.
• storm-pomdp: Fix for --transformsimple and --transformbinary when used with until formulae.
• storm-pomdp: POMDPs can be parametric as well.