Reset odom from Python Code

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Hello, I am working on an autonomous robot operation and I would need to reset the odometry while the ros is running. This is because I need a clean odom starting with position 0,0,0 to run my python code for segmentation. I am not using a Kobuki base, and I just need to clear the robot odom sometime in the middle of the run. How can I do so?

The diff drive controller code is written here: https://github.com/smd-ros-devel/diff...