Jiaming Yuan 6601a641d7
Thread safe, inplace prediction. (#5389)
Normal prediction with DMatrix is now thread safe with locks.  Added inplace prediction is lock free thread safe.

When data is on device (cupy, cudf), the returned data is also on device.

* Implementation for numpy, csr, cudf and cupy.

* Implementation for dask.

* Remove sync in simple dmatrix.
2020-03-30 15:35:28 +08:00
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