Dask-XGBoost

.. warning::

Dask-XGBoost has been deprecated and is no longer maintained. The functionality
of this project has been included directly in XGBoost. To use Dask and XGBoost
together, please use xgboost.dask instead
https://xgboost.readthedocs.io/en/latest/tutorials/dask.html.

Distributed training with XGBoost and Dask.distributed

This repository offers a legacy option to perform distributed training
with XGBoost on Dask.array and Dask.dataframe collections.

::

pip install dask-xgboost

Please note that XGBoost now includes a Dask API as part of its official Python package.
That API is independent of dask-xgboost and is now the recommended way to use Dask
adn XGBoost together. See
the xgb.dask documentation here https://xgboost.readthedocs.io/en/latest/tutorials/dask.html
for more details on the new API.

Example

.. code-block:: python

from dask.distributed import Client
client = Client('scheduler-address:8786') # connect to cluster

import dask.dataframe as dd
df = dd.read_csv('...') # use dask.dataframe to load and
df_train = ... # preprocess data
labels_train = ...

import dask_xgboost as dxgb
params = {'objective': 'binary:logistic', ...} # use normal xgboost params
bst = dxgb.train(client, params, df_train, labels_train)

bst # Get back normal XGBoost result
<xgboost.core.Booster at ... >

predictions = dxgb.predict(client, bst, data_test)

How this works

For more information on using Dask.dataframe for preprocessing see the
Dask.dataframe documentation <http://dask.pydata.org/en/latest/dataframe.html>_.

Once you have created suitable data and labels we are ready for distributed
training with XGBoost. Every Dask worker sets up an XGBoost slave and gives
them enough information to find each other. Then Dask workers hand their
in-memory Pandas dataframes to XGBoost (one Dask dataframe is just many Pandas
dataframes spread around the memory of many machines). XGBoost handles
distributed training on its own without Dask interference. XGBoost then hands
back a single xgboost.Booster result object.

Larger Example

For a more serious example see

This blogpost <http://matthewrocklin.com/blog/work/2017/03/28/dask-xgboost>_
This notebook <https://gist.github.com/mrocklin/19c89d78e34437e061876a9872f4d2df>_
This screencast <https://youtu.be/Cc4E-PdDSro>_

History

Conversation during development happened at dmlc/xgboost #2032 <https://github.com/dmlc/xgboost/issues/2032>_

Dependencies of dask-xgboost (5).
Dependency	Optional
dask	false
distributed	false
xgboost	false
scipy	true
sparse	true

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dask-xgboost

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