Update dmlc-core. (#4924)

* Fixed some threading errors.
* Allow updating parameters.
This commit is contained in:
Jiaming Yuan 2019-10-09 23:16:45 -04:00 committed by GitHub
parent 6c9b6f11da
commit c2cce4fac3
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Subproject commit 808f485387f9a03f78fa9f1159f387d0d91b7a28 Subproject commit 20676bbc413a7d1f0229ec32701743cd5c205360