Rong Ou 14ef38b834
Initial support for federated learning (#7831)
Federated learning plugin for xgboost:
* A gRPC server to aggregate MPI-style requests (allgather, allreduce, broadcast) from federated workers.
* A Rabit engine for the federated environment.
* Integration test to simulate federated learning.

Additional followups are needed to address GPU support, better security, and privacy, etc.
2022-05-05 21:49:22 +08:00

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XGBoost Plugin for Federated Learning
=====================================
This folder contains the plugin for federated learning. Follow these steps to build and test it.
Install gRPC
------------
```shell
sudo apt-get install build-essential autoconf libtool pkg-config cmake ninja-build
git clone -b v1.45.2 https://github.com/grpc/grpc
cd grpc
git submodule update --init
cmake -S . -B build -GNinja -DABSL_PROPAGATE_CXX_STD=ON
cmake --build build --target install
```
Build the Plugin
----------------
```shell
# Under xgboost source tree.
mkdir build
cd build
cmake .. -GNinja -DPLUGIN_FEDERATED=ON
ninja
cd ../python-package
pip install -e . # or equivalently python setup.py develop
```
Test Federated XGBoost
----------------------
```shell
# Under xgboost source tree.
cd tests/distributed
./runtests-federated.sh
```