Skip to main content

General Ising graph simulated annealing solver

Project description

> :warning: dwave-neal is deprecated in favor of dwave-samplers.

https://img.shields.io/pypi/v/dwave-neal.svg https://codecov.io/gh/dwavesystems/dwave-neal/branch/master/graph/badge.svg https://readthedocs.com/projects/d-wave-systems-dwave-neal/badge/?version=latest https://circleci.com/gh/dwavesystems/dwave-neal.svg?style=svg

dwave-neal

An implementation of a simulated annealing sampler.

A simulated annealing sampler can be used for approximate Boltzmann sampling or heuristic optimization. This implementation approaches the equilibrium distribution by performing updates at a sequence of increasing beta values, beta_schedule, terminating at the target beta. Each spin is updated once in a fixed order per point in the beta_schedule according to a Metropolis- Hastings update. When beta is large the target distribution concentrates, at equilibrium, over ground states of the model. Samples are guaranteed to match the equilibrium for long ‘smooth’ beta schedules.

For more information, see Kirkpatrick, S.; Gelatt Jr, C. D.; Vecchi, M. P. (1983). “Optimization by Simulated Annealing”. Science. 220 (4598): 671–680

Example Usage

import neal

sampler = neal.SimulatedAnnealingSampler()

h = {0: -1, 1: -1}
J = {(0, 1): -1}
sampleset = sampler.sample_ising(h, J)

Installation

To install:

pip install dwave-neal

To build from source:

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

License

Released under the Apache License 2.0. See LICENSE file.

Contributing

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

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

dwave-neal-0.6.0.tar.gz (6.4 kB view hashes)

Uploaded Source

Built Distribution

dwave_neal-0.6.0-py3-none-any.whl (8.7 kB view hashes)

Uploaded Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page