Rory Mitchell 5e582b0fa7
Combine thread launches into single launch per tree for gpu_hist (#4343)
* Combine thread launches into single launch per tree for gpu_hist
algorithm.

* Address deprecation warning

* Add manual column sampler constructor

* Turn off omp dynamic to get a guaranteed number of threads

* Enable openmp in cuda code
2019-04-29 09:58:34 +12:00
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