[EM] Treat ellpack as dense matrix when there's no compression. #10870
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Compression info. Row stride. Add test. cleanup. Add tests. name. Cleanup. comment. used n_symbols. cleanup. Histogram. Split up tests. Write compressed. Comment. from ghist. Work on ellpack -> ghist. look into adapter case. from data. cleanup. start working on tests. check. From adapter. to ghist. dense. empty. feature groups. feature group. histogram. rename. CPU. cleanup. Enable get cut. Fix test.
cleanup. Fix. test. fix.
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This enables XGBoost to use shared memory to build histograms. In addition, it lowers memory usage and speeds up external memory for data that cannot be compressed using the ellpack format.