Answered

Can I determine the embedding from the response?

Thomas P

July 26, 2018 20:16

Given this code:

sampler = EmbeddingComposite(DWaveSampler(endpoint=URL, token=TOKEN, solver=SOLVER))
response = sampler.sample(bqm, num_reads=60)

Is there a way to determine (from the response variable) the embedding that was used?

2 comments

Alex C (Report)
July 27, 2018 17:21 (Edited July 27, 2018 17:22)
Hi Thomas,

Right now there is no way to get the embedding, though there is a feature request on github to return it as part of the response https://github.com/dwavesystems/dwave-system/issues/76 . Note that we use github issues for feature requests and bugs specific to the open source tools, for questions (like yours) this community is the correct place.

The current 'best practice' for those who wish to work with embeddings is to use the FixedEmbeddingComposite. See the below code snippet:
```
import minorminer
from dwave.system.samplers import DWaveSampler
from dwave.system.composites import FixedEmbeddingComposite

dwave_sampler = DWaveSampler()

target_edgelist = dwave_sampler.edgelist
source_edgelist = list(bqm.quadratic)  # the edges in the binary quadratic model

embedding = minorminer.find_embedding(source_edgelist, target_edgelist)

sampler = FixedEmbeddingComposite(dwave_sampler, embedding)
```
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Thomas P (Report)
July 27, 2018 17:48

Very helpful - thanks!

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