[QUESTION] Way of using from python script

[wmita]

Thank you for yours
I hope to use this, but I have some questions.

I would like to use Hydra from a Python script. I want to use it so that it takes the ROSBAG as input and outputs the coordinates and class of the detected object.
Therefore, I have pip install and am preparing to make it available from the script, but it is not working.
Is there a procedure I should refer to?

My runtime environment is,
Ubuntu20.04 on Docker
Python 3.8.10
Thank you in advance.

[wmita]

The Topic content shows that the coordinates and class label of the object are published in dsg_markers.
However, this issue
said that parsing from visualization messages is not recommended.

How can I extract only the object coordinates and class labels as output from Hydra ROS topic?