dwavesystems / dwavesystems/dwave-system

Make DWaveSampler picklable

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Description

DWaveSampler is not picklable. It should be in order to integrate for example with sklearn.

```python
In [1]: from dwave.system.samplers import DWaveSampler

In [2]: import pickle

In [3]: annealer = DWaveSampler()

In [4]: pickle.dumps(annealer)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
in ()
----> 1 pickle.dumps(annealer)

TypeError: can't pickle _thread.lock objects
```

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