📦 Archive copy — for reference. This is a preserved copy of the original deeplearning4j/deeplearning4j repository as it existed before the ~2019 monorepo consolidation rewrote its git history. The rewrite erased the original commit attribution for many contributors; this archive retains it. The live project continues at deeplearning4j/deeplearning4j (14.2k ★ as of 2026). No original issues or PRs have survived the change in ownership — PR numbers referenced in merge commits no longer resolve. Recovered from a 2018 public mirror; read-only, not maintained, not for building.

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Monorepo of Deeplearning4j

Welcome to the new monorepo of Deeplearning4j that contains the source code for all the following projects, in addition to the original repository of Deeplearning4j moved to deeplearning4j:

• https://github.com/deeplearning4j/libnd4j
• https://github.com/deeplearning4j/nd4j
• https://github.com/deeplearning4j/datavec
• https://github.com/deeplearning4j/arbiter
• https://github.com/deeplearning4j/nd4s
• https://github.com/deeplearning4j/gym-java-client
• https://github.com/deeplearning4j/rl4j
• https://github.com/deeplearning4j/scalnet
• https://github.com/deeplearning4j/jumpy

To build everything, we can use commands like

./change-cuda-versions.sh x.x
./change-scala-versions.sh 2.xx
./change-spark-versions.sh x
mvn clean install -Dmaven.test.skip -Dlibnd4j.cuda=x.x -Dlibnd4j.compute=xx

or

mvn clean install -Ptestresources -Ptest-native -Dlibnd4j.cuda=x.x -Dlibnd4j.compute=xx

Also included in the monorepo is a tutorial series in Zeppelin available in:

• https://github.com/deeplearning4j/deeplearning4j/tree/master/deeplearning4j/dl4j-examples/tutorials