Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/15059
Oops, I found that ```ml.TestingUtils``` was located at ```mllib-local```
module and we can not move it to ```spark-core``` since ```mllib-local``` is
not intended to depend on other spark sub modules. So we can not move these
generic testing utils from mllib to common IMO. May be we can have one sub
module like hadoop common for the whole spark common utils which does not
depend on other modules, and this should be further defined. cc @MLnick @srowen
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