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Document CUDA requirement, lack of external memory on GPU (#3624)

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* Document fact that GPU doesn't support external memory

* Document CUDA requirement
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Philip Hyunsu Cho
2018-08-22 22:47:10 -07:00
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parent 4ed8a88240
commit cb4de521c1
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doc/tutorials/external_memory.rst
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@@ -13,6 +13,10 @@ The external memory version takes in the following filename format:
The ``filename`` is the normal path to libsvm file you want to load in, and ``cacheprefix`` is a
path to a cache file that XGBoost will use for external memory cache.
.. note:: External memory is not available with GPU algorithms
External memory is not available when ``tree_method`` is set to ``gpu_exact`` or ``gpu_hist``.
The following code was extracted from `demo/guide-python/external_memory.py <https://github.com/dmlc/xgboost/blob/master/demo/guide-python/external_memory.py>`_:
.. code-block:: python