trivialfis 5a7f7e7d49 Implement devices to devices reshard. (#3721)
* Force clearing device memory before Reshard.
* Remove calculating row_segments for gpu_hist and gpu_sketch.
* Guard against changing device.
2018-09-28 17:40:23 +12:00
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2018-08-19 16:40:30 +12:00
2018-08-19 16:40:30 +12:00
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