Alexander Condello comments

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                                            Alexander Condello

DQM Test Samplers

https://github.com/dwavesystems/dimod/pull/820 adds an `ExactDQMSolver`. `RandomDQMSampler` is still an open feature request.

Add keyword argument(s) to `QM.energies` and `BQM.energies` to force stricter input checking

~Closed by #1010~ oops, wrong issue

Add a shrink_to_fit function for the quadratic models.

Do you want this just at the C++ level or the Cython level as well? Probably not the Python level...

Allow kwargs for bqm specification

Duplicates #760

`SampleSet.to_pandas_dataframe` fails for record arrays with fields of more than one dimension

Note that [pandas.DataFrame.from_records](https://pandas.pydata.org/pandas-docs/version/0.22/generated/pandas.DataFrame.from_records.html) also fails for this case with `Exception: Data must be 1-dimensional`.

Allow CQMs to be constructed in storage rather than memory

Changed the title because [memory-mapped](https://en.wikipedia.org/wiki/Memory-mapped_I/O) is not quite what we're talking about here.

Symbolic higher order binary polynomials

I love this suggestion in principal but there are a few things that we need to do before we should allow this: 1) We need a performant implementation of `BinaryPolynomial`....

Symbolic higher order binary polynomials

For those who want to do this in the mean time, you can actually use sympy to get something like the behaviour you want with ```python import itertools import dimod...

Initializing BinaryQuadraticModel using keyword arguments gives empty model

This is a known issue. The signature actually [doesn't have any named arguments except `vartype`](https://github.com/dwavesystems/dimod/blob/aee92735437ff9290f306c2b90d45bd18ecdc1e6/dimod/bqm/adjarraybqm.pyx#L53). We could add named kwargs for convenience, though obviously it would complicate the implementation. Totally...

Cannot concatenate sample sets of unlike types

The obvious fix is to use `autoconvert=True` in https://github.com/dwavesystems/dimod/blob/12ba0c93a48c39029d8dd7ada9600d30051d73ba/dimod/sampleset.py#L237 but there appears to be a bug in numpy, or at the very least a documentation hole. Example: ``` import numpy...