[Discussion] Something about training spleeter model

I tried to train my model with musdb18 dataset with CLI and find out the total required time of training. I implemented the command "time spleeter train -p ./configs/musdb_config.json -d ~/data/musdb18/train/". I have modified the json file and checked all of the directories, but It seems nothing happened. The terminal only printed out:

INFO:spleeter:Start model training
INFO:spleeter:Model training done

real 0m37.829s
user 0m34.643s
sys 0m1.982s

Reproduce the reported `spleeter train` command with `./configs/musdb_config.json` and the stated musdb18 directory. Read the configuration and inspect the CLI's training entry point and its output to determine why it immediately reports completion. Done means identifying whether training actually starts and documenting the cause of the zero-length run.

Written by the indexing model from the issue text.