Release History

Releases follow the major.minor.micro scheme recommended by PEP440, where

  • major increments denote a change that may break API compatibility with previous major releases

  • minor increments add features but do not break API compatibility

  • micro increments represent bugfix releases or improvements in documentation

0.3.0 - API Improvements

Several improvements and changes to public API.

New features

  • PR #292: Implement Topology.to_openmm and remove ToolkitRegistry.toolkit_is_available

  • PR #322: Install directories for the lookup of OFFXML files through the entry point group openforcefield.smirnoff_forcefield_directory. The ForceField class doesn’t search in the data/forcefield/ folder anymore (now renamed data/test_forcefields/), but only in data/.

API-breaking Changes

  • PR #278: Standardize variable/method names

  • PR #291: Remove ForceField.load/to_smirnoff_data, add ForceField.to_file/string and ParameterHandler.add_parameters. Change behavior of ForceField.register_X_handler functions.

Bugfixes

  • PR #327: Fix units in tip3p.offxml (note that this file is still not loadable by current toolkit)

  • PR #325: Fix solvent box for provided test system to resolve periodic clashes.

  • PR #325: Add informative message containing Hill formula when a molecule can’t be matched in Topology.from_openmm.

  • PR #325: Provide warning or error message as appropriate when a molecule is missing stereochemistry.

  • PR #316: Fix formatting issues in GBSA section of SMIRNOFF spec

  • PR #308: Cache molecule SMILES to improve system creation speed

  • PR #306: Allow single-atom molecules with all zero coordinates to be converted to OE/RDK mols

  • PR #313: Fix issue where constraints are applied twice to constrained bonds

0.2.2 - Bugfix release

This release modifies an example to show how to parameterize a solvated system, cleans up backend code, and makes several improvements to the README.

Bugfixes

  • PR #279: Cleanup of unused code/warnings in main package __init__

  • PR #259: Update T4 Lysozyme + toluene example to show how to set up solvated systems

  • PR #256 and PR #274: Add functionality to ensure that links in READMEs resolve successfully

0.2.1 - Bugfix release

This release features various documentation fixes, minor bugfixes, and code cleanup.

Bugfixes

  • PR #267: Add neglected <ToolkitAM1BCC> documentation to the SMIRNOFF 0.2 spec

  • PR #258: General cleanup and removal of unused/inaccessible code.

  • PR #244: Improvements and typo fixes for BRD4:inhibitor benchmark

0.2.0 - Initial RDKit support

This version of the toolkit introduces many new features on the way to a 1.0.0 release.

New features

  • Major overhaul, resulting in the creation of the SMIRNOFF 0.2 specification and its XML representation

  • Updated API and infrastructure for reference SMIRNOFF ForceField implementation

  • Implementation of modular ParameterHandler classes which process the topology to add all necessary forces to the system.

  • Implementation of modular ParameterIOHandler classes for reading/writing different serialized SMIRNOFF forcefield representations

  • Introduction of Molecule and Topology classes for representing molecules and biomolecular systems

  • New ToolkitWrapper interface to RDKit, OpenEye, and AmberTools toolkits, managed by ToolkitRegistry

  • API improvements to more closely follow PEP8 guidelines

  • Improved documentation and examples

0.1.0

This is an early preview release of the toolkit that matches the functionality described in the preprint describing the SMIRNOFF v0.1 force field format: [DOI].

New features

This release features additional documentation, code comments, and support for automated testing.

Bugfixes

Treatment of improper torsions

A significant (though currently unused) problem in handling of improper torsions was corrected. Previously, non-planar impropers did not behave correctly, as six-fold impropers have two potential chiralities. To remedy this, SMIRNOFF impropers are now implemented as three-fold impropers with consistent chirality. However, current force fields in the SMIRNOFF format had no non-planar impropers, so this change is mainly aimed at future work.