Could not import vpi module in Python 3.9

Autonomous Machines Jetson & Embedded Systems Jetson Orin NX
1

Summary

In JetPack 5.1.1, VPI 2.2.6 was installed for Python 3.8 and Python 3.9.
But, I could not import vpi module in Python 3.9.

$ python3.9
Python 3.9.5 (default, Nov 23 2021, 15:27:38) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import vpi
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/numpy/core/__init__.py", line 17, in <module>
    from . import multiarray
  File "/usr/lib/python3/dist-packages/numpy/core/multiarray.py", line 14, in <module>
    from . import overrides
  File "/usr/lib/python3/dist-packages/numpy/core/overrides.py", line 7, in <module>
    from numpy.core._multiarray_umath import (
ModuleNotFoundError: No module named 'numpy.core._multiarray_umath'

Does NVIDIA release JetPack package without testing?

Environment

  • Jetson Orin NX(16GB)
  • JetPack 5.1.1
  • VPI 2.2.6
ii  libnvvpi2                                  2.2.6                                arm64        NVIDIA Vision Programming Interface library
ii  python3.8-vpi2                             2.2.6                                arm64        NVIDIA VPI python 3.8 bindings
ii  python3.9-vpi2                             2.2.6                                arm64        NVIDIA VPI python 3.9 bindings
ii  vpi2-demos                                 2.2.6                                arm64        NVIDIA VPI GUI demo applications
ii  vpi2-dev                                   2.2.6                                arm64        NVIDIA VPI C/C++ development library and headers
ii  vpi2-samples                               2.2.6                                arm64        NVIDIA VPI command-line sample applications

Supplementary information

I could import vpi module in Python 3.8.

$ python3.8
Python 3.8.10 (default, Mar 13 2023, 10:26:41) 
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import vpi
3

Hi,

Based on the error message, you don’t install numpy for Python 3.9.
Could you install it and try it again?

ModuleNotFoundError: No module named 'numpy.core._multiarray_umath'

Thanks.

4

@AastaLLL

Based on the error message, you don’t install numpy for Python 3.9.

I checked that NumPy was installed.

python3.9 -m pip list | grep numpy
numpy                  1.17.4

Could you install it and try it again?

I reinstalled NumPy by the following command.

sudo apt install python3.9-dev
sudo python3.9 -m pip install --upgrade --no-deps --force-reinstall numpy==1.17.4

As a result, I could avoid this error. But, I have doubts.
Why is the package broken at the time NVIDIA provides it?

5

Hi,

In JetPack, we only provide VPI for Python 3.9.
Users will need to install the dependencies like NumPy on their own.

Thanks.

6

In JetPack, we only provide VPI for Python 3.9.

I understood the policy.

Users will need to install the dependencies like NumPy on their own.

Users could not know this assumption.
So, I think that NVIDIA should specify this point in the document.

And, broken NumPy package was installed when user install nvidia-jetpack via apt.
So, I think that the situation where the NumPy must be reinstalled is incorrect.

7

Hi,

Thanks for the suggestion.
We will check this with our internal team and check how to improve this.

Thanks.

9

Thank you for your reply. I’m looking forward to improvement.

11

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