Eliminate host synchronization.
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feature-request
- Dominant language
- C++
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Description
## column sampler
- [x] https://github.com/dmlc/xgboost/blob/614f47c477472118a20838b4880ab1ab51572c3c/src/common/random.h#L177
- [x] Need device implementation of sampling.
## gradient
Validate data once at the beginning.
- [ ] https://github.com/dmlc/xgboost/blob/614f47c477472118a20838b4880ab1ab51572c3c/src/objective/regression_obj.cu#L142
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