Jiaming Yuan 325bc93e16
[dask] Use distributed.MultiLock (#6743)
* [dask] Use `distributed.MultiLock`

This enables training multiple models in parallel.

* Conditionally import `MultiLock`.
* Use async train directly in scikit learn interface.
* Use `worker_client` when available.
2021-03-16 14:19:41 +08:00
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