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Document GPU objectives in NEWS. (#3865)

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Jiaming Yuan 2018-11-05 14:46:45 +13:00 committed by GitHub
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@ -23,6 +23,10 @@ This file records the changes in xgboost library in reverse chronological order.
* Mitigate tracker "thundering herd" issue on large cluster. Add exponential backoff retry when workers connect to tracker. * Mitigate tracker "thundering herd" issue on large cluster. Add exponential backoff retry when workers connect to tracker.
* With this change, we were able to scale to 1.5k executors on a 12 billion row dataset after some tweaks here and there. * With this change, we were able to scale to 1.5k executors on a 12 billion row dataset after some tweaks here and there.
### New feature: Additional objective functions for GPUs
* New objective functions ported to GPU: `hinge`, `multi:softmax`, `multi:softprob`, `count:poisson`, `reg:gamma`, `"reg:tweedie`.
* With supported objectives, XGBoost will select the correct devices based on your system and `n_gpus` parameter.
### Major bug fix: learning to rank with XGBoost4J-Spark ### Major bug fix: learning to rank with XGBoost4J-Spark
* Previously, `repartitionForData` would shuffle data and lose ordering necessary for ranking task. * Previously, `repartitionForData` would shuffle data and lose ordering necessary for ranking task.
* To fix this issue, data points within each RDD partition is explicitly group by their group (query session) IDs (#3654). Also handle empty RDD partition carefully (#3750). * To fix this issue, data points within each RDD partition is explicitly group by their group (query session) IDs (#3654). Also handle empty RDD partition carefully (#3750).
@ -33,6 +37,7 @@ This file records the changes in xgboost library in reverse chronological order.
### API changes ### API changes
* Column sampling by level (`colsample_bylevel`) is now functional for `hist` algorithm (#3635, #3862) * Column sampling by level (`colsample_bylevel`) is now functional for `hist` algorithm (#3635, #3862)
* GPU tag `gpu:` for regression objectives are now deprecated. XGBoost will select the correct devices automatically (#3643)
* Add `disable_default_eval_metric` parameter to disable default metric (#3606) * Add `disable_default_eval_metric` parameter to disable default metric (#3606)
* Experimental AVX support for gradient computation is removed (#3752) * Experimental AVX support for gradient computation is removed (#3752)
* XGBoost4J-Spark * XGBoost4J-Spark