tgravescs commented on issue #25983: [SPARK-29327][MLLIB]Support specifying features via multiple columns URL: https://github.com/apache/spark/pull/25983#issuecomment-545521402 yes we have an actual implementation that is using this for XGBoost running on GPUs. This version takes advantage of the columnar layout. @firestarman should have the code for the XGBoost CPU side as well that could side step creating the vector, which he should be able to point us to. We thought it would be a good api addition for convenience and allow the benefits I stated above.
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