num_repeats effect on costs (DWave's solvers)

Question

The QBSolv solver has the attribute num_repeats. What does this attribute mean with regard to Braket's pricing structure of tasks and shots? Is every additional num_repeat an additional task or an additional shot (or "something else")?

Thanks in advance.

Accepted Answer

Hello, and thank you for your interest in Braket! The `num_repeats` parameter on D-Wave's qbsolv does not correspond directly to Braket tasks or Braket shots. The qbsolv algorithm decomposes an annealing problem into smaller subproblems which are then sent to a sampling device. The `num_repeats` parameter controls how many times this happens, but the number of subproblems generated on each pass of the algorithm is dependent upon the input annealing problem which is to be solved. You can try using D-Wave's `TrackingComposite` ([documentation](https://docs.ocean.dwavesys.com/en/stable/docs_dimod/reference/sampler_composites/composites.html#module-dimod.reference.composites.tracking)) with one of the local samplers to test out how qbsolv may slice up your annealing problem.

num_repeats effect on costs (DWave's solvers)

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