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[EM] Compress dense ellpack. (#10821)
This helps reduce the memory copying needed for dense data. In addition, it helps reduce memory usage even if external memory is not used. - Decouple the number of symbols needed in the compressor with the number of features when the data is dense. - Remove the fetch call in the `at_end_` iteration. - Reduce synchronization and kernel launches by using the `uvector` and ctx.
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Original file line number | Diff line number | Diff line change |
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@@ -33,6 +33,7 @@ ipch | |
*.filters | ||
*.user | ||
*log | ||
rmm_log.txt | ||
Debug | ||
*suo | ||
.Rhistory | ||
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