Make fragment calibration configurable #323
Merged
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Currently, the version of automatic calibration that has performed the best is from before we fixed the bug that artificially reduced the number of fragments we picked relative to our intention; it always picked the 500 best fragments. It is possible that calibrating on this higher-quality set meaningfully improves performance and this can be tested by making this parameter configurable.
NB: I have not made the min_fragments configurable because I don't think that the min_fragments code actually has any effect on the way the code currently runs (if there are fewer fragments than min_fragments, calibration still proceeds with the lower number). I may therefore remove it soon.