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Changelog

This changelog lists only the most important changes. Smaller (bug)fixes as well as non-mature features are not part of the changelog. The releases of major and minor versions contain an overview of changes since the last major/minor update.

Branch Changes

Version 1.6.x

Version 1.6.4 (20xx/xx)

Added support for PRISM models that use unbounded integer variables.
Added an export of check results to json. Use --exportresult in the command line interface.
Added computation of steady state probabilities for DTMC/CTMC in the sparse engine. Use --steadystate in the command line interface.
Implemented parsing and model building of Stochastic multiplayer games (SMGs) in the PRISM language. No model checking implemented, for now.
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 write to actions.
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.

Version 1.6.3 (2020/11)

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.

Version 1.6.2 (2020/09)

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.

Version 1.6.0 (2020/06)

Changed default Dd library from cudd to sylvan. The Dd library can be changed back to cudd using the command line switch --ddlib.
Scheduler export: Properly handle models with end components. Added export in .json format.
CMake: Search for Gurobi prefers new versions.
CMake: We no longer ship xerces-c. If xerces-c is not found on the system, storm-gspn will not be able to parse xml-based GSPN formats.
CMake: Added option STORM_LOAD_QVBS to automatically download the quantitative verification benchmark set.
Eigen library: The source code of Eigen is no longer included but downloaded from an external repository instead. Incremented Eigen version to 3.3.7 which fixes a compilation issue with recent XCode versions.
Tests: Enabled tests for permissive schedulers.
storm-counterexamples: fix when computing multiple counterexamples in debug mode.
storm-dft: Renamed setting --show-dft-stats to dft-statistics and added approximation information to statistics.
storm-pomdp: Implemented approximation algorithms that explore (a discritization of) the belief MDP, allowing to compute safe lower- and upper bounds for a given property.
storm-pomdp: Implemented almost-sure reachability computations: graph-based, one-shot SAT-based, and iterative SAT-based.
`storm-pomdp': Various changes such that transformation to pMCs is now again supported (and improved).
Fixed several compiler warnings.

Version 1.5.x

Version 1.5.1 (2020/03)

Jani models are now parsed using exact arithmetic.

Version 1.5.0 (2020/03)

Added portfolio engine which picks a good engine (among other settings) based on features of the symbolic input.
Abort of Storm (via timeout or CTRL+C for example) is now gracefully handled. After an abort signal the program waits some seconds to output the result computed so far and terminates afterwards. A second signal immediately terminates the program.
Setting --engine dd-to-sparse --bisimulation now triggers extracting the sparse bisimulation quotient.
JIT model building is now invoked via --engine jit (instead of --jit).
DRN: support import of choice labelling.
Added option --build:buildchoiceorig to build a model (PRISM or JANI) with choice origins (which are exported with, e.g. --exportscheduler).
Implemented optimistic value iteration for sound computations and set it as new default in --sound mode.
Time bounded properties for Markov automata are now computed with relative precision. Use --absolute for the previous behavior.
Apply the maximum progress assumption while building a Markov automaton with one of the symbolic engines.
Added option --build:nomaxprog to disable applying the maximum progress assumption during model building (for Markov Automata).
Added hybrid engine for Markov Automata.
Improved performance of the Unif+ algorithm (used for time-bounded properties on Markov Automata).
Various performance improvements for model building with the sparse engine.
storm-dft: Symmetry reduction is now enabled by default and can be disabled via --nosymmetryreduction.
storm-pomdp: Only accept POMDPs that are canonical.
storm-pomdp: Prism language extended with observable expressions.
storm-pomdp: Various fixes that prevented usage.
Several bug fixes.

Version 1.4.x

Version 1.4.1 (2019/12)

Implemented long run average (LRA) computation for DTMCs/CTMCs via value iteration and via gain/bias equations.
Added several LRA related settings in a new settings module. Note that --minmax:lramethod has been replaced by --lra:nondetmethod.

Version 1.4.0 (2019/11)

Added support for multi-dimensional quantile queries.
Added support for multi-objective model checking under pure (deterministic) schedulers with bounded memory using --purescheds.
Allow to quickly check a benchmark from the Quantitative Verification Benchmark Set using the --qvbs option.
Added script resources/examples/download_qvbs.sh to download the QVBS.
If an option is unknown, Storm now suggests similar option names.
Flagged several options as 'advanced' to clean up the --help-message. Use --help all to display a complete list of options.
Support for parsing of exact time bounds for properties, e.g., P=? [F=27 "goal"].
Export of optimal schedulers when checking MDPs with the sparse engine (experimental). Use --exportscheduler <filename>.
PRISM language: Support for the new round operator.
PRISM language: Improved error messages of the parser.
JANI: Allow bounded types for constants.
JANI: Support for non-trivial reward accumulations.
JANI: Fixed support for reward expressions over non-transient variables.
DRN: Added support for exact parsing and action-based rewards.
DRN: Support for placeholder variables which allows to parse recurring rational functions only once.
Fixed sparse bisimulation of MDPs (which failed if all non-absorbing states in the quotient are initial).
Support for export of MTBDDs from Storm.
Support for k-shortest path counterexamples (arguments -cex --cextype shortestpath)
New settings module transformation for Markov chain transformations. Use --help transformation to get a list of available transformations.
Support for eliminating chains of Non-Markovian states in MAs via --eliminate-chains.
Export to dot format allows for maximal line width in states (argument --dot-maxwidth <width>)
storm-conv can now apply transformations on a prism file.
storm-pars: Enabled building, bisimulation and analysis of symbolic models.
storm-dft: Support partial-order for state space generation.
storm-dft: Compute lower and upper bounds for number of BE failures via SMT.
storm-dft: Allow to set relevant events which are not set to Don't Care.
storm-dft: Support for constant failed BEs. Use flag --uniquefailedbe to create a unique constant failed BE.
storm-dft: Support for probabilistic BEs via PDEPs.
Fixed linking with Mathsat on macOS.
Fixed linking with IntelTBB for GCC.
Fixed compilation for macOS Mojave and higher.
Several bug fixes.

Version 1.3.x

Version 1.3.0 (2018/12)

Slightly improved scheduler extraction
Environments are now part of the c++ API
Heavily extended JANI support, in particular:
- arrays, functions, state-exit-rewards (all engines)
- indexed assignments, complex reward expressions (sparse engine)
- several jani-related bug fixes
New binary storm-conv that handles conversions between model files
New binary storm-pomdp that handles the translation of POMDPs to pMCs.
Maximal progress assumption is now applied while building Markov Automata (sparse engine).
Improved Unif+ implementation for Markov Automata, significantly reduced memory consumption.
Added support for expected time properties for discrete time models
Bug fix in the parser for DRN (MDPs and MAs might have been affected).
storm-gspn: Improved .pnpro parser
storm-gspn: Added support for single/infinite/k-server semantics for GSPNs given in the .pnpro format
storm-gspn: Added option to set a global capacity for all places
storm-gspn: Added option to include a set of standard properties when converting GSPNs to jani
storm-pars: Added possibility to compute the extremal value within a given region using parameter lifting
storm-dft: DFT translation to GSPN supports Don't Care propagation
storm-dft: Support DFT analysis via transformation from DFT to GSPN to JANI
storm-dft: Added SMT encoding for DFTs
storm-dft: Improved Galileo and JSON parser
Several bug fixes
Storm uses the master14 branch of carl from now on

Comparison with Version 1.2.0 (details see below)

Heavily extended JANI-support
New binary storm-conv that handles conversion between model files
New binary storm-pomdp that handles the translation of POMDPs to pMCs.
storm-gspn improved
Sound value iteration

Version 1.2.x

Version 1.2.3 (2018/07)

Fix in version parsing

Version 1.2.2 (2018/07)

Sound value iteration (SVI) for DTMCs and MDPs
Topological solver for linear equation systems and MinMax equation systems (enabled by default)
Added support for expected total rewards in the sparse engine
By default, iteration-based solvers are no longer aborted after a given number of steps.
Improved export for jani models
A fix in parsing jani properties
Several extensions to high-level counterexamples
storm-parsers extracted to reduce linking time
storm-counterexamples extracted to reduce linking time
storm-dft: improvements in Galileo parser
storm-dft: test cases for DFT analysis
Improved Storm installation
Several bug fixes

Version 1.2.1 (2018/02)

Multi-dimensional reward bounded reachability properties for DTMCs.
storm-dft: transformation of DFTs to GSPNs
Several bug fixes

Version 1.2.0 (2017/12)

C++ api changes: Building model takes BuilderOptions instead of extended list of Booleans, does not depend on settings anymore.
storm-cli-utilities now contains cli related stuff, instead of storm-lib
Symbolic (MT/BDD) bisimulation
Fixed issue related to variable names that can not be used in Exprtk.
DRN parser improved
LP-based MDP model checking
Sound (interval) value iteration
Support for Multi-objective multi-dimensional reward bounded reachability properties for MDPs.
RationalSearch method to solve equation systems exactly
WalkerChae method for solving linear equation systems with guaranteed convergence
Performance improvements for sparse model building
Performance improvements for conditional properties on MDPs
Automatically convert MA without probabilistic states into CTMC
Fixed implemention of Fox and Glynn' algorithm
storm-pars: support for welldefinedness constraints in mdps.
storm-dft: split DFT settings into IO settings and fault tree settings
storm-dft: removed obsolete explicit model builder for DFTs
Features for developers:
- Solvers can now expose requirements
- unbounded reachability and reachability rewards now correctly respect solver requirements
- Environment variables (such as the solver precisions) can now be handled more flexible
- changes to Matrix-Vector operation interfaces, in particular fixed some issues with the use Intel TBB

Version 1.1.x

Version 1.1.0 (2017/8)

Support for long-run average rewards on MDPs and Markov automata using a value-iteration based approach.
Storm can now check MDPs and Markov Automata (i.e. MinMax equation systems) via Linear Programming.
Parametric model checking is now handled in a separated library/executable called storm-pars.
Wellformedness constraints on PMCs:
- include constraints from rewards
- are in smtlib2
- fixed
- computation of only constraints without doing model checking is now supported
Fix for nested formulae
JANI: Explicit engine supports custom model compositions.
Support for parsing/building models given in the explicit input format of IMCA.
Storm now overwrites files if asked to write files to a specific location.
Changes in build process to accommodate for changes in carl. Also, more robust against issues with carl.
USE_POPCNT removed in favor of FORCE_POPCNT. The popcnt instruction is used if available due to march=native, unless portable is set. Then, using FORCE_POPCNT enables the use of the SSE 4.2 instruction

Version 1.0.x

Version 1.0.1 (2017/4)

Multi-objective model checking support now fully included
Several improvements in parameter lifting
Several improvements in JANI parsing
Properties can contain model variables
Support for rational numbers/functions in decision diagrams via sylvan
Elimination-based solvers (exact solution) for models stored as decision diagrams
Export of version and configuration to cmake
Improved building process

Version 1.0.0 (2017/3)

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