Enable passing full validation dataset, calling user supplied predict() per-era #43
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This should allow the diagnostics runs to be more efficient - numerai-predict can run a full validation run in a single process.
The user-supplied pickle is only loaded once, but the predict() function is called once per era, keeping the API intact. However, if the model has to do one-time initialization which might be expensive, it could skip these on subsequent calls, saving a lot of time.
See also the updated tests.