Source code for hybrid.reference.qbsolv

# Copyright 2019 D-Wave Systems Inc.
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# Licensed under the Apache License, Version 2.0 (the "License");
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#   http://www.apache.org/licenses/LICENSE-2.0
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"""QBSolv inspired simple workflows."""

import dimod
import hybrid

__all__ = ['SimplifiedQbsolv']


[docs]def SimplifiedQbsolv(max_iter=10, max_time=None, convergence=3, energy_threshold=None, max_subproblem_size=30): """Races a Tabu solver and a QPU-based sampler of flip-energy-impact induced subproblems. For arguments description see: :class:`~hybrid.reference.kerberos.Kerberos`. """ energy_reached = None if energy_threshold is not None: energy_reached = lambda en: en <= energy_threshold workflow = hybrid.Loop( hybrid.Race( hybrid.InterruptableTabuSampler(), hybrid.EnergyImpactDecomposer( size=max_subproblem_size, rolling=True, rolling_history=0.15) | hybrid.QPUSubproblemAutoEmbeddingSampler() | hybrid.SplatComposer() ) | hybrid.ArgMin() | hybrid.TrackMin(output=True), max_iter=max_iter, max_time=max_time, convergence=convergence, terminate=energy_reached) return workflow