Raise SkipTest if external is missing
dep : string
Name of the external
ver_dep : string, optional
If for version checking use some different key, e.g. shogun:rev. If not specified, dep will be used.
min_version : None or string or tuple
Minimal required version
max_version : None or string or tuple
Maximal required version
mvpa2.testing.tools.reseed_rng
mvpa2.testing.tools.timed
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