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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.
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](http://qcomp.org/benchmarks/) 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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