SolverFailureError: quadratic must be a sequence of length 93

• 

  David J  (Report)

  January 17, 2023 14:05

  Hello,

  Sorry you are having trouble with your code. Let's try to get you back up and running.

  Are you able to share a minimal code example that reproduces the behaviour? 
  Also can you please share the whole stack trace to help better understand the error?
  Thanks for reaching out!

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• 

  Emily A  (Report)

  January 17, 2023 20:23

  Thank you very much! I can't really share a minimal code example, because as noted, this only happens in one very specific context (on the 39th run of a specific loop of code) and I don't know what is causing it. But please find below the stack trace, in case that helps! 

  SolverFailureError                        Traceback (most recent call last)
  Cell In [15], line 21
       19 print(i)
       20 newdata = data.iloc[ : , i*639 : (i + 1)*639]
  ---> 21 weightsxx, boxx, bhxx = dostuff(newdata, epsilon, weights[0][ i*639 : (i + 1)*639,i*16 : (i + 1)*16], bo[0][   i*639 : (i + 1)*639], bh[0][   i*16 : (i + 1)*16], 50)
       22 weightslist.append(weightsxx)
       23 bolist.append(boxx)
  
  Cell In [5], line 85, in dostuff(data, epsilon, ww, boo, bhh, num)
       82 sampler2 = FixedEmbeddingComposite(sampler,
       83     embedding=emb)
       84 sampleset = sampler2.sample(bqm, num_reads=500)
  ---> 85 res = findav(sampleset.record) 
       86 print(res)
       87 res0 += res[0:len(data.columns)] 
  
  File ~/env/lib/python3.9/site-packages/dimod/sampleset.py:1121, in SampleSet.record(self)
     1105 @property
     1106 def record(self):
     1107     """:obj:`numpy.recarray` containing the samples, energies, number of occurences, and other sample data.
     1108 
     1109     Examples:
     (...)
     1119 
     1120     """
  -> 1121     self.resolve()
     1122     return self._record
  
  File ~/env/lib/python3.9/site-packages/dimod/sampleset.py:1470, in SampleSet.resolve(self)
     1468 # if it doesn't have the attribute then it is already resolved
     1469 if hasattr(self, '_future'):
  -> 1470     samples = self._result_hook(self._future)
     1471     self.__init__(samples.record, samples.variables, samples.info, samples.vartype)
     1472     del self._future
  
  File ~/env/lib/python3.9/site-packages/dwave/system/composites/embedding.py:284, in EmbeddingComposite.sample.<locals>.async_unembed(response)
      279 def async_unembed(response):
      280     # unembed the sampleset aysnchronously.
      282     warninghandler.chain_break(response, embedding)
  --> 284     sampleset = unembed_sampleset(response, embedding, source_bqm=bqm,
      285                                   chain_break_method=chain_break_method,
      286                                   chain_break_fraction=chain_break_fraction,
      287                                   return_embedding=return_embedding)
      289     if return_embedding:
      290         sampleset.info['embedding_context'].update(
      291             embedding_parameters=embedding_parameters,
      292             chain_strength=embedding.chain_strength)
  
  File ~/env/lib/python3.9/site-packages/dwave/embedding/transforms.py:626, in unembed_sampleset(target_sampleset, embedding, source_bqm, chain_break_method, chain_break_fraction, return_embedding)
      623 except KeyError:
      624     raise ValueError("given bqm does not match the embedding")
  --> 626 record = target_sampleset.record
      628 unembedded, idxs = chain_break_method(target_sampleset, chains)
      630 reserved = {'sample', 'energy'}
  
  File ~/env/lib/python3.9/site-packages/dimod/sampleset.py:1121, in SampleSet.record(self)
     1105 @property
     1106 def record(self):
     1107     """:obj:`numpy.recarray` containing the samples, energies, number of occurences, and other sample data.
     1108 
     1109     Examples:
     (...)
     1119 
     1120     """
  -> 1121     self.resolve()
     1122     return self._record
  
  File ~/env/lib/python3.9/site-packages/dimod/sampleset.py:1470, in SampleSet.resolve(self)
     1468 # if it doesn't have the attribute then it is already resolved
     1469 if hasattr(self, '_future'):
  -> 1470     samples = self._result_hook(self._future)
     1471     self.__init__(samples.record, samples.variables, samples.info, samples.vartype)
     1472     del self._future
  
  File ~/env/lib/python3.9/site-packages/dwave/system/samplers/dwave_sampler.py:422, in DWaveSampler.sample.<locals>._hook(computation)
      420 except (SolverError, InvalidAPIResponseError) as exc:
      421     if not self.failover:
  --> 422         raise exc
      423     if isinstance(exc, SolverAuthenticationError):
      424         raise exc
  
  File ~/env/lib/python3.9/site-packages/dwave/system/samplers/dwave_sampler.py:409, in DWaveSampler.sample.<locals>._hook(computation)
      406     return sampleset
      408 try:
  --> 409     return resolve(computation)
      411 except (ProblemUploadError, RequestTimeout, PollingTimeout) as exc:
      412     if not self.failover:
  
  File ~/env/lib/python3.9/site-packages/dwave/system/samplers/dwave_sampler.py:399, in DWaveSampler.sample.<locals>._hook.<locals>.resolve(computation)
      397 def resolve(computation):
      398     sampleset = computation.sampleset
  --> 399     sampleset.resolve()
      401     if warninghandler is not None:
      402         warninghandler.too_few_samples(sampleset)
  
  File ~/env/lib/python3.9/site-packages/dimod/sampleset.py:1470, in SampleSet.resolve(self)
     1468 # if it doesn't have the attribute then it is already resolved
     1469 if hasattr(self, '_future'):
  -> 1470     samples = self._result_hook(self._future)
     1471     self.__init__(samples.record, samples.variables, samples.info, samples.vartype)
     1472     del self._future
  
  File ~/env/lib/python3.9/site-packages/dwave/cloud/computation.py:823, in Future.sampleset.<locals>.<lambda>(f)
      818 except ImportError:
      819     raise RuntimeError("Can't construct SampleSet without dimod. "
      820                        "Re-install the library with 'bqm' support.")
      822 self._sampleset = sampleset = dimod.SampleSet.from_future(
  --> 823     self, lambda f: f.wait_sampleset())
      825 # propagate id to sampleset as well
      826 # note: this requires dimod>=0.8.21 (before that version SampleSet
      827 # had slots set which prevented dynamic addition of attributes).
      828 sampleset.wait_id = self.wait_id
  
  File ~/env/lib/python3.9/site-packages/dwave/cloud/computation.py:755, in Future.wait_sampleset(self)
      752 """Blocking sampleset getter."""
      754 # blocking result get
  --> 755 result = self._load_result()
      757 # common problem info: id/label
      758 problem_info = dict(problem_id=self.id)
  
  File ~/env/lib/python3.9/site-packages/dwave/cloud/computation.py:893, in Future._load_result(self)
      891 # Check for other error conditions
      892 if self._exception is not None:
  --> 893     raise self._exception
      895 # If someone else took care of this while we were waiting
      896 if self._result is not None:
  
  File ~/env/lib/python3.9/site-packages/dwave/cloud/client/base.py:1460, in Client._handle_problem_status(self, message, future)
     1458             raise SolverOfflineError(errmsg)
     1459         else:
  -> 1460             raise SolverFailureError(errmsg)
     1462 except Exception as exc:
     1463     # If there were any unhandled errors we need to release the
     1464     # lock in the future, otherwise deadlock occurs.
     1465     future._set_exception(exc)
  
  SolverFailureError: quadratic must be a sequence of length 93

   

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