Separate Training from Preprocessing

[miquelramirez]

• [x] Create preprocess.py script to separate data preparation from training

[miquelramirez]

See commit ae180f3d5f9f948c94c4144e1d26d4a0b89f6241

[miquelramirez]

Hi @wenyenwei,

you will need to validate that this script is working as expected/designed, as I don't have the unprocessed data.