Oliver Laslett 18813a26ab allow arbitrary cross validation fold indices (#3353)
* allow arbitrary cross validation fold indices

 - use training indices passed to `folds` parameter in `training.cv`
 - update doc string

* add tests for arbitrary fold indices
2018-06-30 19:23:49 +00:00
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2018-06-27 11:20:27 +12:00
2018-06-27 11:20:27 +12:00
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