Jiaming Yuan f1275f52c1
Fix specifying gpu_id, add tests. (#3851)
* Rewrite gpu_id related code.

* Remove normalised/unnormalised operatios.
* Address difference between `Index' and `Device ID'.
* Modify doc for `gpu_id'.
* Better LOG for GPUSet.
* Check specified n_gpus.
* Remove inappropriate `device_idx' term.
* Clarify GpuIdType and size_t.
2018-11-06 18:17:53 +13:00
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