Running tests on ARM64 with python3.6 and numpy 1.19.5 fails - 'sigill, core dumped' error

[asenyaev]

When the package of opencv-python and numpy==1.19.5 were installed on python 3.6, and python tests were run, the error core dumped happens. It happens because of the issue.

How to resolve:

1. Downgrade the numpy version to 1.19.4 using the following command:

python3.6 -m pip install -U numpy==1.19.4

2. Still use numpy with the version 1.19.5, but use the following command before running tests:

export OPENBLAS_CORETYPE=ARMV8

Architecture: aarch64
Python version: 3.6
OS: Ubuntu 18.04