Not able to run pytorch parallel on Google colab

Hi,

We are trying process video files to extract features from it, we are using keras3 with pytorch. We could run multiprocessing code on our local laptop but same code is not working on google colab, Please find the notebook with the parallel execution code –Google Colab

On our local laptop we can see sub processes start execution as we have print statements showing the progress of execution, but on colab it silently finishes processing. Can someone please help on the same