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Document num_parallel_tree. #4022

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Dec 25, 2018
Merged

Document num_parallel_tree. #4022

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4 changes: 4 additions & 0 deletions doc/parameter.rst
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Expand Up @@ -192,6 +192,10 @@ Parameters for Tree Booster
- ``cpu_predictor``: Multicore CPU prediction algorithm.
- ``gpu_predictor``: Prediction using GPU. Default when ``tree_method`` is ``gpu_exact`` or ``gpu_hist``.

* ``num_parallel_tree``, [default=1]
- Number of parallel trees constructed during each iteration. This
option is used to support boosted random forest

Additional parameters for Dart Booster (``booster=dart``)
=========================================================

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2 changes: 1 addition & 1 deletion src/gbm/gbtree.cc
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Expand Up @@ -52,7 +52,7 @@ struct GBTreeTrainParam : public dmlc::Parameter<GBTreeTrainParam> {
.set_default(1)
.set_lower_bound(1)
.describe("Number of parallel trees constructed during each iteration."\
" This option is used to support boosted random forest");
" This option is used to support boosted random forest.");
DMLC_DECLARE_FIELD(updater_seq)
.set_default("grow_colmaker,prune")
.describe("Tree updater sequence.");
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