# Changelog¶

## v1.2 (October 9, 2019)¶

### Improvements and changes¶

• Variable names in qaoa.cost_function.py have been updated to better reflect their counterparts in qaoa.parameters.py.

• Sped up cost function calls and construction for PrepareAndMeasureOnWFSim and QAOACostFunOnWFSim. For very small systems and hamiltonians WavefunctionSimulator().expectation() is still faster, than our implementation.

• Added an example of using QAOA to solve a simple QUBO problem.

• Sped up tests by removing all with local_qvm() context managers. You have to manually start a qvm in the background for the tests now!

• Added sample_qaoa_bistrings to utilities.py

### Bugfixes¶

• Can access FourierExtendedParams.z_rotation_angles now for hamiltonians without bias terms.

## v1.0-beta (September 12, 2019)¶

• Initial beta release