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arm: cross-compilation helper script documentation (#9172) 

Signed-off-by: AbdelRauf <rauf@konduit.ai>
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Abdelrauf 2021-02-02 02:37:39 +04:00 committed by GitHub
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libnd4j/RaspberryPi.md
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### Cross compiling for rapsberry pi and android on linux
`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
|-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
```
ARMCOMPUTE_TAG=v20.05
```
##### old one
Please follow following instructions to build nd4j for raspberry PI:
1. download cross compilation tools for Raspberry PI