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I am checking out XGBoost documentation and it's stated that XGBoost is an optimized distributed gradient boosting library.

What is meant by distributed?

Have a nice day

Tommaso Bendinelli
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It means that it can be run on a distributed system (i.e. on multiple networked computers).

From XGBoost's documentation:

The same code runs on major distributed environment(Hadoop, SGE, MPI) and can solve problems beyond billions of examples. The most recent version integrates naturally with DataFlow frameworks(e.g. Flink and Spark).

Jcart
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