[35.2.1][35.3.1]["20.04"] non LTS numpy (not compatible with some LTS software)

[bmegli]

Some software or Jetson itself installs newer numpy through pip.

• (from memory) happens after every install of ZED SDK

This is non LTS version which is not backwards compatible with some LTS software.

[bmegli]

The LTS version of 20.04 is

apt-cache policy python3-numpy
python3-numpy:
  Installed: 1:1.17.4-5ubuntu3.1
  Candidate: 1:1.17.4-5ubuntu3.1

[bmegli]

The problem stems from numpy removed support for deprecated features

• deprecated
  • https://numpy.org/doc/stable/release/1.20.0-notes.html#using-the-aliases-of-builtin-types-like-np-int-is-deprecated
• expired
  • https://numpy.org/doc/stable/release/1.24.0-notes.html#expired-deprecations

[bmegli]

From above:

• any numpy version >=1.24.0 may cause trouble

[bmegli]

Workaround/Fix

Ideally, if in control of software make it compatible with newer/older numpy versions

• forward and backward compatibility by not using deprecated features

If not in control there are many solutions, one of them is to downgrade numpy.

Downgrade numpy

To LTS version or last before expiration

# check installed version
pip show numpy

If numpy >= 1.24 downgrade to latest pre 1.24

# install at 1.23.5, last before 1.24
pip install --force-reinstall numpy==1.23.5

[bmegli]

The problem stems from using pip to install system level packages (which interferes with OS level package compatibility guarantees)

[bmegli]

Some affected software:

• baldor makes the package fails moveit/moveit_calibration#133