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Change Log

All notable changes to this project will be documented in this file. This project adheres to Semantic Versioning.

0.14.1 - 2024-05-##

  • Add flat argument to AMPL.get_iis.

0.14.0 - 2024-05-21

  • Allow assigning values to indexed sets from a dictionary with the lists of members for every index.
  • Add AMPL.get_iis() to return dictionaries with variables and constraints in IIS.
  • Add AMPL.get_solution() to return a dictionary with the solution.

0.13.3 - 2024-02-20

  • Fix issues with AMPL.solve(verbose=False) when the solver argument was not set.

0.13.2 - 2024-01-05

  • OutputHandler: Flush standard output after every message.

0.13.1 - 2023-12-29

  • Upgrade libampl to 2.3.7-20231229.
  • Upgrade ampltools to 0.7.3 adding amplpy.bundle command.
  • Fix issue with environment variables on Windows in a generic way.
  • Add return_output and solvername_options arguments to AMPL.solve
    • You can now do ampl.solve(solver="gurobi", gurobi_options="outlev=1").

0.13.0 - 2023-12-26

  • [Breaking] amplpy.modules now have priority in the PATH.
  • Fix ampl_libpath issue on Windows.

0.12.2 - 2023-12-11

  • Upgrade libampl to 2.3.6-20231130.
  • Add solver argument to AMPL.solve.

0.12.1 - 2023-09-21

  • Fix Parameter.set_values with np.ndarray objects.

0.12.0 - 2023-08-29

  • Upgrade libampl to 2.2.0-20230825.
  • Use x-ampl by default if available.
  • Add properties AMPL.solve_result/AMPL.solve_result_num.
  • Add arguments to AMPL.solve to specify problem name and verbosity.
  • Allow passing pandas.Series to AMPL.set_data and Parameter.set_values.
  • Add AMPL.snapshot, and implement AMPL.export_model/AMPL.export_data using it.
  • [Breaking] Drop Python 3.5 compatibility.
  • [Breaking] Deprecate direct access methods to amplpy.DataFrame. Deprecated methods are still available with _ prefix.

0.11.2 - 2023-07-11

  • [Breaking] Cast floats to integers whenever possible.

0.11.1 - 2023-07-04

  • Add aliases Entity.get_values.to_pandas/to_list/to_dict.
  • Automatically stack 2D pandas.DataFrames.

0.11.0 - 2023-06-21

  • Upgrade libampl to 2.1.2-20230618.
  • Add AMPL.write, PresolveException, and InfeasibilityException.
  • Improve handling of numpy types.
  • Allow assigning values to sets from iterables.
  • [Breaking] Drop async functionalities.
  • [Breaking] DataFrame.to_pandas: start using multi-index by default.
  • [Breaking] Drop Python 2.7 compatibility.
  • [Breaking] Iterating over non-indexed sets now iterates over set members.

0.10.0 - 2023-05-22

  • Upgrade libampl to 2.1.0-20230522.
  • Breaking: Entity names do not contain spaces in the indices anymore.

0.9.3 - 2023-04-21

  • Removed CamelCase from docstrings.

0.9.2 - 2023-04-05

  • Add message to append to AMPLException messages.

0.9.1 - 2023-03-22

  • Simplify ampl_notebook import: "from amplpy import ampl_notebook".

0.9.0 - 2023-03-14

  • Preload amplpy.modules if found (reduces need for modules.load()).
  • Vendor ampltools.

0.8.6 - 2023-01-23

  • Add amplpy.modules.

0.8.5 - 2022-08-23

  • Update libampl to 2.0.11-20220823.
  • Ensure times and gentimes default to disabled.

0.8.4 - 2022-08-02

  • Update libampl to 2.0.10-20220627.
  • Disable options times and gentimes during internal operations.

0.8.3 - 2022-06-23

  • Improved handling of numpy types.

0.8.2 - 2022-05-27

  • [BREAKING] Raise RuntimeError in Entity.get_values if there are any issues with the data.
  • Update libampl to 2.0.9.20220527.
  • Fixed hanging when license check fails on Windows.
  • Allow '-' in option names.
  • Drop 32-bit support.
  • Add ampltools as dependency.

0.8.1 - 2022-01-21

  • [BREAKING] Raise KeyError exceptions instead of TypeError exceptions when accessing entities that do not exist.

0.8.0 - 2021-12-24

  • Update libampl to 2.0.8-2.
  • Allow users to specify the name of the AMPL executable.
  • Allow users to choose between using camelCase and snake_case methods.
  • Drop AMPL.exportGurobi model. It is now part of amplpy_gurobi.

0.7.2 - 2021-12-01

  • Improve performance of many operations by moving code to the C++ layer.

0.7.1 - 2021-07-26

  • Update libampl to 2.0.6-0.
  • Add Entity.xref.
  • Include complete license error message in license error exceptions.

0.7.0 - 2021-01-25

  • Fix bug when assigning sets with mixed types.
  • Add support for pathlib.Path paths.
  • Basic support for MSYS, CYGWIN, and MINGW.
  • Support for linux-ppc64le and linux-aarch64.
  • Update libampl to 2.0.4-0.

0.6.11 - 2020-02-28

  • Add support for ppc64le.

0.6.10 - 2019-11-16

  • Fix "ImportError: DLL load failed" not fixed in the previous version.

0.6.9 - 2019-11-16

  • Fix "ImportError: No module named _amplpython" introduced in the previous version.

0.6.8 - 2019-11-16

  • Add Python 3.8 support.

0.6.7 - 2019-06-22

  • Add optional parameter index_names to DataFrame.fromPandas.
  • Add DataFrame.fromDict to load data from dictionaries.
  • Allow setting entity values directly from dictionaries.

0.6.6 - 2019-05-11

  • Update internal library.
  • Add AMPL.exportModel.
  • AMPL.exportData now supports indexed sets.

0.6.5 - 2019-04-14

  • Improve AMPL.exportGurobiModel and AMPL.importGurobiSolution.
  • Add verbose option to AMPL.exportGurobiModel.
  • Add register_magics to register %%ampl and %%ampl_eval.

0.6.4 - 2019-02-13

  • Fix dll loading issue with python versions that come with conda.

0.6.3 - 2018-12-04

  • Fix issue with indexed sets (by updating the internal library).

0.6.2 - 2018-11-20

  • Add support for Pandas Series.
  • Add optional gurobiDriver parameter to AMPL.exportGurobiModel.

0.6.1 - 2018-11-13

  • Improve robustness of AMPL.exportGurobiModel.
  • Improve error message when AMPL is not in the search path.

0.6.0 - 2018-11-03

  • Upgrade internal API to v2.0.
  • Add experimental methods AMPL._startRecording and AMPL._stopRecording.
  • Add experimental method AMPL._loadSession.
  • Add method AMPL.getCurrentObjective.
  • Add support to Python 3.7.
  • Fix truncated values in sets (amplapi#337).
  • Add method AMPL.importGurobiSolution.
  • Add method AMPL.getOutput.

0.5.0 - 2018-05-06

  • Breaking: AMPL errors raise exceptions by default.
  • Breaking: Drop support for Python 3.3 on Linux.
  • Add AMPL.exportData.
  • Add AMPL.exportGurobiModel.

0.4.1 - 2018-04-12

  • Fix: compatibility issues with multiple python versions.

0.4.0 - 2018-04-10

  • Improve interaction with Pandas and Numpy.
  • Add DataFrame.fromNumpy.
  • Entity.setValues now accepts Pandas DataFrames.
  • Parameter.setValues and Set.setValues now accept Numpy arrays and matrices.
  • Breaking: DataFrame.toList and DataFrame.doDict do not wrap scalar values into lists anymore.

0.3.4 - 2018-02-24

  • Fix: error messages not being shown in Jupyter Notebooks.
  • Breaking: AMPL errors no longer raise exceptions by default.

0.3.3 - 2018-01-09

  • Fix issues related to the passing of infinity to AMPL.

0.3.2 - 2017-12-13

  • Fix issue with DataFrames created with pandas.read_table.

0.3.1 - 2017-11-17

  • Fix precision issue in parameters.

0.3.0 - 2017-10-13

  • Introduce alternative method to access entities.

0.2.0 - 2017-08-05

  • Add DataFrame.fromPandas and DataFrame.toPandas.

0.1.2 - 2017-08-04

  • Improve DataFrame initialization.
  • Fix issue with stdout in jupyter notebooks.

0.1.1 - 2017-07-30

  • Fix issues with strings in Python 3.

0.1.0 - 2017-07-22

  • Initial release.