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RELEASES.md

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Release Notes

Version 5.0.2 (2024-06)

Python API

  1. The minimum python version was bumped from 3.6 to 3.8.

Bugfixes

  1. Fixed compilation issue when PETSc is not installed.
  2. Fixed installation issue in Conda environments.

Internal code base

  1. Use Boost instead of GSL for computing qtable for vesicle surface diffusion.
  2. Remove GSL as a minimum prerequisite.

stepsblender python package

  1. Fixed issues caused by changes in Blender 4.1 python API.

Version 5.0.1 (2024-02)

New Features

  1. Added a new mode of kiss-and-run release allowing for partial release of vesicle content.
  2. Added a variety of automatic checks to vesicle-based models.
  3. Added support for network-free simulation of multi-state complexes with Wmdirect.

Python API

  1. Added a new CustomResults result selector to save arbitrary data to STEPS HDF5 files.
  2. Added a .description property to ResultSelectors.
  3. Added a .patchTriNeighbs property to TriReferences to get neighboring triangles in the same patch.

Version 5.0.0 (2023-06)

New Features

  1. Introduce a new solver named TetVesicle that simulates vesicles, lipid rafts and related phenomena such as endocytosis, exocytosis and active transport on virtual actin filaments. The solver is built on top of the TetOpSplit routines for parallel simulation of SSA reaction and diffusion events.
  2. Add a new stepsblender python module that allows visualisation of STEPS simulation data recorded with XDMFHandler using the Blender 3D computer graphics software (https://www.blender.org/).
  3. Checkpointing added or updated for solvers TetVesicle, TetOpSplit, Tetexact, TetODE, Wmdirect, Wmrk4, Wmrssa.

Build and Packaging

  1. Installation process now automatically installs missing python dependencies.

Internal code base

  1. All stochastic solvers are now reproducible.
  2. Numerous fixes, optimizations and modernizations.

Version 4.1.1 (2023-04)

Build and Packaging

  1. Fix older cmake files causing installation issues
  2. Fix -DSTEPS_USE_DIST_MESH=False cmake flag not preventing Omega_h installation

Version 4.1.0 (2023-04)

License update

  1. Project license changed to GPL3.0.

Python API

  1. Added automatic saving to HDF5 files (HDF5Handler) and XDMF files (XDMFHandler). Data saved with XDMFHandler can be visualized with scientific visualization software like Paraview.

Internal code base

  1. Performance improvement: Identify the tetrahedra with molecule changes via diffusion (changes caused by reaction are updated by the ssa operator) and update the associated propensities.

Version 4.0.0 (2022-03)

Python API

Introduce a new parallel stochastic reaction-diffusion solver and a deterministic membrane potential solver named DistTetOpSplit. The solver is based on a distributed mesh named DistMesh.

Build and Packaging

  1. STEPS requires a C++ compiler compatible with C++ 17.
  2. New CMake variables to enable profiling of the simulation: STEPS_USE_LIWKID_PROFLING, STEPS_USE_CALIPER_PROFILING, and STEPS_USE_NATIVE_PROFILING see [doc/dev/README.md] for more details on how to use it.
  3. Add support to Apple M1
  4. Add support to compilers GCC 11, LLVM 13, and Apple Clang 13

Version 3.6.0 (2021-02)

Python API

  1. Added a new python API (see documentation) Scripts written for older STEPS version should still work without any modifications. The new python API can be used by adding the following line at the top of a STEPS script:

    import steps.interface

  2. Dropped support for python 2.7. The minimum python version is now 3.6.

Build and Packaging

  1. Added support for OpenMP and AppleClang compiler
  2. Improved CMake structure to allow for faster compilation

Internal code base

  1. Code fixes for segment-tetrahedron intersection

Version 3.5.0 (2019-10)

Python API

  1. values for unknown tetrahedron and triangle identifiers changed from -1 to steps.geom.UNKNOWN_TET and steps.geom.UNKNOWN_TRI respectively. You may use these 2 constants instead of -1.

    A Python 3 Flake8 extension is available to help you migrate your code.

    $ pip3 install flake8 flake8-oist-steps
$ cat test.py
import steps.utilities.meshio as meshio

mesh = meshio.loadMesh('axon_cube_L1000um_D866m_1135tets')[0]
idx = mesh.findTetByPoint([0, 0, 0])
if idx == -1:
    print('boundary')
$ flake8 test.py
./test.py:5:4: E421 consider using steps.geom.UNKNOWN_TET constant instead of -1.

    You may use the following snippet in your scripts header to have backward compatible code:

    try:
    from steps.geom import UNKNOWN_TET, UNKNOWN_TRI
except ImportError:
    UNKNOWN_TET = -1
    UNKNOWN_TRI = -1

  2. A new constant steps.geom.INDEX_DTYPE provides the proper NumPy datatype according to whether STEPS has been built with 32 bits or 64 bits identifiers.

Build and Packaging

  1. New USE_64_BITS_INDICES CMake option to use 64bits unsigned integers for identifiers instead of 32bits.
  2. New CMake variables to use either system libraries or bundle code.
    • USE_BUNDLE_EASYLOGGINGP
    • USE_BUNDLE_RANDOM123
    • USE_BUNDLE_SUNDIALS
  3. Improve spack support
  4. Improve support of GCC 7 and higher
  5. Improve support of AppleClang compiler

Internal code base

  1. Disable OpenMP instructions in TetOpSplit solver
  2. Modernize code base by using most of C++11
  3. Increase code safety by using strong types to distinguish identifiers from tetrahedrons, triangles, and vertices

Version 3.4.0 (2018-11)

  1. Optimization of non-spatial deterministic solver Wmrk4. Vast improvement in performance for large models.
  2. Various bug fixes and unit tests.

Version 3.3.0 (2018-04)

  1. Implemented Rejection-based SSA (Thanh V, Zunino R, Priami C (n.d.) On the rejection-based algorithm for simulation and analysis of large-scale reaction networks. The Journal of Chemical Physics 142:244106) as a faster alternative to Wmdirect
  2. Assertion and Exception logging overhaul
  3. Remove SWIG interface
  4. Matlab Simbiology support utility

Version 3.2.0 (2017-10)

  1. Extensive rework on Cython binding and documentation with Jupyter notebook.
  2. Extend support for Python 3.3~.
  3. several bug fixes. Note: SWIG Binding will be removed in 3.3 release.

Version 3.1.0 (2017-6)

  1. Optimization on solver constructors,which significantly speedup the initialization time for simulations with large meshes.
  2. Cython binding for user interface
  3. Parallel EField solver using PETSc library
  4. Surface Diffusion Boundary for Tetexact and TetOpSplit
  5. Further improve CMake compilation system
  6. Restructure validation and test packages

Version 3.0.2 (2017-2)

  1. Bug fix: abort CMake if SWIG is REQUIRED but not found

Version 3.0.1 (2017-2)

  1. Bug fix for crash problem when providing fractional value to setCompCount() and setPatchCount() in tetexact

Version 3.0.0 (2017-2)

  1. Implement parallel TetOpSplit solver.
  2. Change compilation system to CMake.

Version 2.2.1 (2014-10)

  1. Bug fixes for CUBIT-STEPS geometry preparation toolkit.
  2. Implement directional diffusion constant.

Version 2.2.0 (2014-04-16)

  1. Add CUBIT-STEPS geometry preparation toolkit and visualization toolkit.
  2. Add "Region of Interest" dataset in Tetmesh Geometry and related functions in Tetexact solver
  3. Add direct NumPy access functions in Tetmesh geometry and Tetexact solver

Version 2.1.0 (2013-09-05)

  1. Add steps.geom.castToTmComp and steps.geom.castToTmPatch methods for casting Comp and Patch objects to their TetMesh counterpart (if possible).
  2. Added direct connection between TetODE and E-Field. Previously connection was possible only through the python interface.
  3. Other small additions such as optional percentage of starting nodes tested for mesh breadth first search in E-Field setup.

Version 2.0.0 (2013-04-22)

  1. First version to include E-Field and related objects. Allows simulation of the potential across a membrane specified as a collection of triangles comprising a surface in the tetrahedral mesh. See documentation for more information.
  2. Addition of solver TetODE for spatial deterministic simulations. Uses the CVODE library for solutions.
  3. Addition of surface diffusion in mesh-based solvers (Tetexact and TetODE), which models a diffusive flux between triangles that form part of a patch surface, analogous to volume diffusion between tetrahedral elements in a compartment.
  4. Several other smaller additions and fixes.

Version 1.3.0 (2011-12)

  1. SSA engine changes from Direct SSA to Composition & Rejection SSA for Tetexact solver.

Version 1.2.1 (2011-06-10)

  1. Important bugfix in Tetexact to fix a problem that was causing crashes during construction.

Version 1.2.0 (2011-04-13)

  1. SBML support in steps/utilities/sbml.py
  2. Addition of Diffusion Boundary object, which allows for optional chemical diffusion between connected compartments.
  3. Initial conditions improvement for Tetexact solver, resulting in a uniform initial spatial concentration across the compartment (or patch) regardless of tetrahedron volumes (or triangle areas), important where tetrahedrons vary considerably in volume. Thanks to Haroon Anwar for bringing this issue to our attention.
  4. Bugfix on Wmrk4 deterministic solver on the reset() function, which previously did not reset counts in Patches.
  5. Changed zero-order reaction constants to the conventional M/s. Previously was /s.
  6. Bugfix on surface-reactions. Now reaction constants for reactions that involve reactants only on a patch (nothing in a volume) are correctly scaled in 2D, as opposed to previous 3D scaling. Thanks to Gabriela Antunes for pointing out this one.
  7. Additions to examples folder to include scripts that link to the user documentation, found in examples/tutorial.

Version 1.1.2 (2010-05-8)

  1. Solve crash problem of Tetexact solver in some Linux system. Binary packages of version 1.1.1 are not affected, so only source package is released.

Version 1.1.1 (2010-04-7)

  1. New setup.py to fix undefined symbol error in Linux
  2. function name fix in utilities/visual.py

Version 1.1.0 (2010-03-20)

  1. Replace GNU distribution system with Python Distutils.
  2. Provide a visualization toolkit for mesh based simulation (steps.utilitis.visual)
  3. Provide checkpointing support for Wmdirect and Tetexact solvers. (Please check user manual for more details)
  4. New user manual and API reference

Version 1.0.1 (2010-01-28)

  1. Bug fix of utilities.meshio.importTetgen() method crashing.
  2. Changes to 'def' classes so that these classes no longer store a pointer to model level objects or access data from those objects, instead coping all data during construction and setup. Also modified rng.py to be directly created by swig for compatibility with python3.

Version 1.0.0 (2010-01-05)

First release.