dwave.system.composites.VirtualGraphComposite.sample#

VirtualGraphComposite.sample(bqm, apply_flux_bias_offsets=True, **kwargs)[source]#

Sample the binary quadratic model.

On the first call of a sampling method, finds a minor-embedding for the given binary quadratic model (BQM). All subsequent calls to its sampling methods reuse this embedding.

Parameters:

  • bqm (BinaryQuadraticModel) – Binary quadratic model to be sampled from.

  • chain_strength (float/mapping/callable, optional) – Sets the coupling strength between qubits representing variables that form a chain. Mappings should specify the required chain strength for each variable. Callables should accept the BQM and embedding and return a float or mapping. By default, chain_strength is calculated with uniform_torque_compensation().

  • chain_break_method (function, optional) – Method used to resolve chain breaks during sample unembedding. See unembed_sampleset().

  • chain_break_fraction (bool, optional, default=True) – Add a chain_break_fraction field to the unembedded response with the fraction of chains broken before unembedding.

  • embedding_parameters (dict, optional) – If provided, parameters are passed to the embedding method as keyword arguments. Overrides any embedding parameters passed to the constructor. Only used on the first call.

  • **parameters – Parameters for the sampling method, specified by the child sampler.

Returns:

SampleSet