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dimod is a shared API for samplers. It provides:

  • classes for quadratic models---such as the binary quadratic model (BQM) class that contains Ising and QUBO models used by samplers such as the D-Wave system---and higher-order (non-quadratic) models.
  • reference examples of samplers and composed samplers.
  • abstract base classes for constructing new samplers and composed samplers.

(For explanations of the terminology, see the Ocean glossary.)

Example Usage

>>> import dimod
>>> # Construct a problem
>>> bqm = dimod.BinaryQuadraticModel({0: -1, 1: 1}, {(0, 1): 2}, 0.0, dimod.BINARY)
>>> # Use dimod's brute force solver to solve the problem
>>> sampleset = dimod.ExactSolver().sample(bqm)
>>> print(sampleset)
   0  1 energy num_oc.
1  1  0   -1.0       1
0  0  0    0.0       1
3  0  1    1.0       1
2  1  1    2.0       1
['BINARY', 4 rows, 4 samples, 2 variables]

See the documentation for more examples.


Compatible with Python 3.6+:

pip install dimod

To install from source (requires pip>=10.0.0):

pip install -r requirements.txt
python install

When developing on dimod, it is often convenient to build the extensions in place:

pip install -r requirements.txt
python build_ext --inplace


Released under the Apache License 2.0. See LICENSE file.


Ocean's contributing guide has guidelines for contributing to Ocean packages.

dimod includes some formatting customization in the .clang-format and setup.cfg files.

Release Notes

dimod makes use of reno to manage its release notes.

When making a contribution to dimod that will affect users, create a new release note file by running

reno new your-short-descriptor-here

You can then edit the file created under releasenotes/notes/. Remove any sections not relevant to your changes. Commit the file along with your changes.

See reno's user guide for details.