List of couplers not currently included in graph

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  David J  (Report)

  February 01, 2019 21:51 (Edited February 22, 2023 23:39)

  Hi Malcolm,

  I don't believe there is a built-in function, but this is a relatively easy task, and a good opportunity to understand the difference between the normal solver and the VFYC (Virtual Full-Yield Chimera) solver.
  
  Check out the following link for more information, but the gist is that the VFYC solver has an idealized QPU with all of the qubits and couplers working.

  VFYC info:
  https://docs.dwavesys.com/docs/latest/c_solver_intro.html#vfyc-solvers

  Here is a simple example that can take advantage of these sampler properties and use some handy Python tricks using sets:

  from dwave.system.samplers import DWaveSampler
  
  vfyc_solver='DW_2000Q_VFYC_2_1'
  my_solver='DW_2000Q_2_1'
  my_token=''
  my_endpoint = 'https://cloud.dwavesys.com/sapi'
  
  my_sampler = DWaveSampler(endpoint=my_endpoint, token=my_token, solver=my_solver)
  vfyc_sampler = DWaveSampler(endpoint=my_endpoint, token=my_token, solver=vfyc_solver)
  
  unavailable_couplers = set(vfyc_sampler.edgelist) - set(my_sampler.edgelist)
  unavailable_qubits = set(vfyc_sampler.adjacency.keys()) - set(my_sampler.adjacency.keys())

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