Please let us know which version of ubuntu are you trying to use and do the examples working fine without the card?

It is Ubuntu 22.04 LTS (GNU/Linux 5.15.0-52-generic x86_64)
The example two_models_two_tpus_threaded does not see the TPUs either.

Is it a native operating system or is it on the virtual box? Also please let me know the python version if its installed on Ubuntu 22.04.

It is native, not virtual.
Python is 3.10.6 (main, Nov 2 2022, 18:53:38) [GCC 11.3.0] on linux

Please install the pycoral and tflite runtime with the below command and try the demo at: https://coral.ai/docs/accelerator/get-started/#3-run-a-model-on-the-edge-tpu

pip install https://github.com/hjonnala/snippets/raw/main/wheels/python3.10/tflite_runtime-2.5.0.post1-cp310-cp310-linux_x86_64.whl

pip install https://github.com/hjonnala/snippets/raw/main/wheels/python3.10/pycoral-2.0.0-cp310-cp310-linux_x86_64.whl

After running this I see the edge tpu library does not appear to be there

$ python3 examples/classify_image.py
--model test_data/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite
--labels test_data/inat_bird_labels.txt
--input test_data/parrot.jpg
Traceback (most recent call last):
File "/home/gsosnow/coral/pycoral/examples/classify_image.py", line 40, in
from pycoral.utils.edgetpu import make_interpreter
File "/home/gsosnow/.local/lib/python3.10/site-packages/pycoral/utils/edgetpu.py", line 24, in
from pycoral.pybind._pywrap_coral import GetRuntimeVersion as get_runtime_version
ImportError: libedgetpu.so.1: cannot open shared object file: No such file or directory

Please install the runtime with the instructions at: https://coral.ai/docs/accelerator/get-started/#1-install-the-edge-tpu-runtime

I have installed and tried to run again but getting the below error:

$ python3 examples/classify_image.py --model test_data/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite --labels test_data/inat_bird_labels.txt --input test_data/parrot.jpg
Traceback (most recent call last):
File "/home/gsosnow/.local/lib/python3.10/site-packages/tflite_runtime/interpreter.py", line 160, in load_delegate
delegate = Delegate(library, options)
File "/home/gsosnow/.local/lib/python3.10/site-packages/tflite_runtime/interpreter.py", line 119, in init
raise ValueError(capture.message)
ValueError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/gsosnow/coral/pycoral/examples/classify_image.py", line 121, in
main()
File "/home/gsosnow/coral/pycoral/examples/classify_image.py", line 71, in main
interpreter = make_interpreter(*args.model.split('@'))
File "/home/gsosnow/.local/lib/python3.10/site-packages/pycoral/utils/edgetpu.py", line 87, in make_interpreter
delegates = [load_edgetpu_delegate({'device': device} if device else {})]
File "/home/gsosnow/.local/lib/python3.10/site-packages/pycoral/utils/edgetpu.py", line 52, in load_edgetpu_delegate
return tflite.load_delegate(_EDGETPU_SHARED_LIB, options or {})
File "/home/gsosnow/.local/lib/python3.10/site-packages/tflite_runtime/interpreter.py", line 162, in load_delegate
raise ValueError('Failed to load delegate from {}\n{}'.format(
ValueError: Failed to load delegate from libedgetpu.so.1

please try the demo with the below lines here and share the logs..

from pycoral.pybind._pywrap_coral import SetVerbosity as set_verbosity
set_verbosity(10)

Here is the output after adding the 2 lines:

$ python3 examples/classify_image.py --model test_data/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite --labels test_data/inat_bird_labels.txt --input test_data/parrot.jpg
I tflite/edgetpu_manager_direct.cc:453] No matching device is already opened for shared ownership.
I driver/driver_factory_default.cc:31] Failed to open /sys/class/apex: No such file or directory
I driver/usb/local_usb_device.cc:944] EnumerateDevices: vendor:0x1a6e, product:0x89a
I driver/usb/local_usb_device.cc:979] EnumerateDevices: checking bus[2] port[0]
I driver/usb/local_usb_device.cc:979] EnumerateDevices: checking bus[1] port[4]
I driver/usb/local_usb_device.cc:979] EnumerateDevices: checking bus[1] port[8]
I driver/usb/local_usb_device.cc:979] EnumerateDevices: checking bus[1] port[0]
I driver/usb/local_usb_device.cc:944] EnumerateDevices: vendor:0x18d1, product:0x9302
I driver/usb/local_usb_device.cc:979] EnumerateDevices: checking bus[2] port[0]
I driver/usb/local_usb_device.cc:979] EnumerateDevices: checking bus[1] port[4]
I driver/usb/local_usb_device.cc:979] EnumerateDevices: checking bus[1] port[8]
I driver/usb/local_usb_device.cc:979] EnumerateDevices: checking bus[1] port[0]
I tflite/edgetpu_manager_direct.cc:471] No device of type Apex (PCIe) is available.
I tflite/edgetpu_manager_direct.cc:471] No device of type Apex (USB) is available.
I tflite/edgetpu_manager_direct.cc:471] No device of type Apex (Reference) is available.
I tflite/edgetpu_manager_direct.cc:502] Failed allocating Edge TPU device for shared ownership.
Traceback (most recent call last):
File "/home/gsosnow/.local/lib/python3.10/site-packages/tflite_runtime/interpreter.py", line 160, in load_delegate
delegate = Delegate(library, options)
File "/home/gsosnow/.local/lib/python3.10/site-packages/tflite_runtime/interpreter.py", line 119, in init
raise ValueError(capture.message)
ValueError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/gsosnow/coral/pycoral/examples/classify_image.py", line 122, in
main()
File "/home/gsosnow/coral/pycoral/examples/classify_image.py", line 72, in main
interpreter = make_interpreter(*args.model.split('@'))
File "/home/gsosnow/.local/lib/python3.10/site-packages/pycoral/utils/edgetpu.py", line 87, in make_interpreter
delegates = [load_edgetpu_delegate({'device': device} if device else {})]
File "/home/gsosnow/.local/lib/python3.10/site-packages/pycoral/utils/edgetpu.py", line 52, in load_edgetpu_delegate
return tflite.load_delegate(_EDGETPU_SHARED_LIB, options or {})
File "/home/gsosnow/.local/lib/python3.10/site-packages/tflite_runtime/interpreter.py", line 162, in load_delegate
raise ValueError('Failed to load delegate from {}\n{}'.format(
ValueError: Failed to load delegate from libedgetpu.so.1

I tflite/edgetpu_manager_direct.cc:471] No device of type Apex (PCIe) is available.
I tflite/edgetpu_manager_direct.cc:471] No device of type Apex (USB) is available.
I tflite/edgetpu_manager_direct.cc:471] No device of type Apex (Reference) is available.

Wondering if you have any USB accelerator device with you. Please try installing the pcie drivers and save the installation logs for reference. If they are any issues with gasket-dkms installation please try building from the source code at: https://github.com/google/gasket-driver

Thank you!! After installing the pcie drivers, it works!! The C++ example two_models_two_tpus_threaded is able to see the tpus now.

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