No test_err in lcurve.out for dpgen-train.

[Edinbur]

Hi All,

There is always no test_err in the lcurve.out of my dpgen-train since using dpgen.
I guess it has tested every disp_freq but no results output in lcurve.out.
So, I wonder if my results are right and how to abtain the test_err in lcurve.out.

[njzjz]

See #649

[Edinbur]

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