A shared API for binary quadratic model samplers.
Project description
dimod
dimod is a shared API for binary quadratic samplers. It provides a binary quadratic model (BQM) class that contains Ising and quadratic unconstrained binary optimization (QUBO) models used by samplers such as the D-Wave system. It also provides utilities for constructing new samplers and composed samplers and for minor-embedding. Its reference examples include several samplers and composed samplers.
Learn more about dimod on Read the Docs.
Example Usage
This example constructs a simple QUBO and converts it to Ising format.
>>> import dimod >>> bqm = dimod.BinaryQuadraticModel({0: -1, 1: -1}, {(0, 1): 2}, 0.0, dimod.BINARY) # QUBO >>> bqm_ising = bqm.change_vartype(dimod.SPIN, inplace=False) # Ising
This example uses one of dimod’s test samplers, ExactSampler, a solver that calculates the energies of all possible samples.
>>> import dimod >>> h = {0: 0.0, 1: 0.0} >>> J = {(0, 1): -1.0} >>> bqm = dimod.BinaryQuadraticModel.from_ising(h, J) >>> response = dimod.ExactSolver().sample(bqm) >>> for sample, energy in response.data(['sample', 'energy']): print(sample, energy) {0: -1, 1: -1} -1.0 {0: 1, 1: 1} -1.0 {0: 1, 1: -1} 1.0 {0: -1, 1: 1} 1.0
See the documentation for more examples.
Installation
Compatible with Python 2 and 3:
pip install dimod
To install with optional components:
pip install dimod[all]
To install from source:
pip install -r requirements.txt
python setup.py install
License
Released under the Apache License 2.0. See LICENSE file.
Contribution
See CONTRIBUTING.rst file.
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