Crosscompilation for arm64

Peter_Peter · November 13, 2017, 5:43pm

I’m looking for a way to compile (install) pytorch for arm64 platform and as of now I’m not interesting of optimized (GPU-like) version of pytorch, it’s good enough to have CPU version able to run on ARM device. Please can you advice how can I either compile or install such a version of pytorch?
In my case I do not have CUDA available on device but instead I have OpenCL 1.2 FP.

SimonW · November 13, 2017, 6:50pm

I think you can just compile with NO_CUDA=1. Could you try it and see if there is any error?

Peter_Peter · November 13, 2017, 7:40pm

I would love too, but is there install dependencies ? Since my platfrom ti’s kind of minimal on packages …

SimonW · November 13, 2017, 8:00pm

Yes, you would need numpy pyyaml mkl setuptools cmake cffi

Peter_Peter · November 14, 2017, 3:38pm

Is it mkl library for arm architecture? Isn’t Intel lib?

SimonW · November 14, 2017, 5:36pm

Right, you can skip that. Sorry I just copied + pasted from Github install page without checking.

NikhilKanda · December 26, 2018, 7:19am

I’m wondering to know if there’s a way to cross compile Pytorch on Allwinner platform (AArch64 processor). Leads are greatly appreciated.

Also @Peter_Peter, I presume that you’ve compiled or installed pytorch on arm64 by now. Could you please post the steps you have followed for the same?

TIA

smth · December 28, 2018, 11:28pm

@NikhilKanda this is the script I used to compile on AGX Xavier which is an ARM64 platform: https://gist.github.com/soumith/45f61db3379db67414814ad9d5f2a427

NikhilKanda · January 2, 2019, 2:07pm

Hi @smth. Thanks for the info, but I hope that is not cross compilation. Correct me if I’m wrong

smth · January 3, 2019, 1:11am

oh, sorry yes this is not cross-compilation.

I dont think all parts of our build system are even ready for cross-compilation

dinesh_mareedu · May 28, 2019, 11:09am

Can you give me any information about cross compilation of pytorch …

solvingPuzzles · January 6, 2020, 2:54am

I haven’t tried this, but the following tutorial looks relevant:

Tumb1eweed · June 22, 2022, 6:34am

met the same problem, need to cross compile libtorch for arm64 in x86-64 platform, is there any resources about this?

Tchamp · June 27, 2022, 3:13pm

To build libtorch you can follow these instructions:

github.com

pytorch/pytorch/blob/master/docs/libtorch.rst

libtorch (C++-only)
===================

The core of pytorch does not depend on Python. A
CMake-based build system compiles the C++ source code into a shared
object, libtorch.so.

Building libtorch using Python
------------------------------

You can use a python script/module located in tools package to build libtorch
::
   cd <pytorch_root>

   # Make a new folder to build in to avoid polluting the source directories
   mkdir build_libtorch && cd build_libtorch

   # You might need to export some required environment variables here.
   Normally setup.py sets good default env variables, but you'll have to do
   that manually.

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Personally, I only use CMake for cross-compiling and add a -DCMAKE_TOOLCHAIN_FILE=<path to your cmake toolchain> argument

If you have problems with binaries like mkrename mkdisp mkalias or addSuffix, you will have to compile sleef with your x86_64 compiler and then add for libtorch the cmake argument : -DNATIVE_BUILD_DIR=<path to native sleef build>.

Jesse_Stone · August 1, 2022, 7:43pm

full build step cross compile on arm64