[doc][jvm-packages] Update information about Python tracker. [skip ci] (#7396)

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Jiaming Yuan 2021-11-05 05:55:13 +08:00 committed by GitHub
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@ -45,7 +45,7 @@ Installation from maven repo
.. note:: Use of Python in XGBoost4J-Spark
By default, we use the tracker in `dmlc-core <https://github.com/dmlc/dmlc-core/tree/master/tracker>`_ to drive the training with XGBoost4J-Spark. It requires Python 2.7+. We also have an experimental Scala version of tracker which can be enabled by passing the parameter ``tracker_conf`` as ``scala``.
By default, we use the tracker in `Python package <https://github.com/dmlc/xgboost/blob/master/python-package/xgboost/tracker.py>`_ to drive the training with XGBoost4J-Spark. It requires Python 3.6+. We also have an experimental Scala version of tracker which can be enabled by passing the parameter ``tracker_conf`` as ``scala``.
Data Preparation
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