Building for raspberry pi or Jetson Nano

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bash pi_build.sh using this helper script one can cross build libnd4j and dl4j with arm COMPUTE LIBRARY . it will download cross compiler and arm compute library.
options
value
description
-a or --arch
arm32
cross compiles for pi/linux 32bit
-a or --arch
arm64
cross compiles for pi/linux 64bit
-a or --arch
android-arm
cross compiles for android 32bit
-a or --arch
android-arm64
cross compiles for android 64bit
-a or --arch
jetson-arm64
cross compiles for jetson nano 64bit
-m or --mvn
​
if provided will build dl4j using maven
example:
bash pi_build.sh --arch android-arm64 --mvn
to change version of the arm COMPUTE LIBRARY modify this line in the script
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    ARMCOMPUTE_TAG=v20.05
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Please follow following instructions to build nd4j for raspberry PI:
1.download cross compilation tools for Raspberry PI
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 $ apt-get/yum install git cmake
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 (You may substitute any path you prefer instead of $HOME/raspberrypi in the following two steps)
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 $ mkdir $HOME/raspberrypi
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 $ export RPI_HOME=$HOME/raspberrypi
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 $ cd $RPI_HOME
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 $ git clone git://github.com/raspberrypi/tools.git
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 $ export PATH=$PATH:$RPI_HOME/tools/arm-bcm2708/arm-rpi-4.9.3-linux-gnueabihf/bin
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2.download deeplearning4j:
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 $ cd $HOME
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 $ git clone https://github.com/eclipse/deeplearning4j.git
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3.build libnd4j:
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 $ cd deeplearning4j/libnd4j
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 $ ./buildnativeoperations.sh -o linux-armhf
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4.build nd4j
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 $ export LIBND4J_HOME=<pathTond4JNI>
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 $ cd $HOME/deeplearning4j/nd4j
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 $ mvn clean install -Djavacpp.platform=linux-armhf -Djavacpp.platform.compiler=$HOME/raspberrypi/tools/arm-bcm2708/arm-rpi-4.9.3-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -DskipTests  -Dmaven.javadoc.skip=true  -pl '!:nd4j-cuda-9.1,!:nd4j-cuda-9.1-platform,!:nd4j-tests'
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