Work side by side with : https://developer.arm.com/solutions/machine-learning-on-arm/developer-material/how-to-guides/image-recognition-on-arm-cortex-m-with-cmsis-nn/before-you-begin
# home...
cd
# Get the compilation toolchain archive
wget https://developer.arm.com/-/media/Arm%20Developer%20Community/Images/Tutorial%20Guide%20Diagrams%20and%20Screenshots/Machine%20Learning/Image%20recognition%20on%20Arm%20Cortex-M%20with%20CMSIS-NN/gcc-arm-none-eabi-7-2017-q4-major-linux.tar.bz2?revision=09f5c905-fb63-4870-85fb-b5b911c0304c&la=en&hash=97C8EB7737FA9221B4A166CD9B040E6FEB624BDA