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Update document for tree_method. [skip ci] (#5106)

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Jiaming Yuan 2019-12-09 22:55:00 +08:00 committed by GitHub
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doc/parameter.rst
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@ -105,7 +105,7 @@ Parameters for Tree Booster
* ``tree_method`` string [default= ``auto``]
- The tree construction algorithm used in XGBoost. See description in the `reference paper <http://arxiv.org/abs/1603.02754>`_.
- XGBoost supports ``hist`` and ``approx`` for distributed training and only support ``approx`` for external memory version.
- XGBoost supports ``approx``, ``hist`` and ``gpu_hist`` for distributed training. Experimental support for external memory is available for ``approx`` and ``gpu_hist``.
- Choices: ``auto``, ``exact``, ``approx``, ``hist``, ``gpu_hist``
- ``auto``: Use heuristic to choose the fastest method.