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Dmatrix refactor stage 1 (#3301)

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* Use sparse page as singular CSR matrix representation

* Simplify dmatrix methods

* Reduce statefullness of batch iterators

* BREAKING CHANGE: Remove prob_buffer_row parameter. Users are instead recommended to sample their dataset as a preprocessing step before using XGBoost.
This commit is contained in:
Rory Mitchell
2018-06-07 10:25:58 +12:00
committed by GitHub
parent 286dccb8e8
commit a96039141a
47 changed files with 650 additions and 1036 deletions
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doc/parameter.md
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@@ -87,8 +87,7 @@ Parameters for Tree Booster
- 'refresh': refreshes tree's statistics and/or leaf values based on the current data. Note that no random subsampling of data rows is performed.
- 'prune': prunes the splits where loss < min_split_loss (or gamma).
- In a distributed setting, the implicit updater sequence value would be adjusted as follows:
- 'grow_histmaker,prune' when dsplit='row' (or default) and prob_buffer_row == 1 (or default); or when data has multiple sparse pages
- 'grow_histmaker,refresh,prune' when dsplit='row' and prob_buffer_row < 1
- 'grow_histmaker,prune' when dsplit='row' (or default); or when data has multiple sparse pages
- 'distcol' when dsplit='col'
* refresh_leaf, [default=1]
- This is a parameter of the 'refresh' updater plugin. When this flag is true, tree leafs as well as tree nodes' stats are updated. When it is false, only node stats are updated.