Crop/delete some faces from model by python

[Jay]

Metashape 1.8.5 Professional version:
After generate 3d model through photos, there are actually some environment part want to remove, What did u with the UI is :
 "Model->Gradual selection->Connected component size(level=50)->Ok, then Edit->Delete selection/ Crop selection"
after this I will get most of good part of my model,   I would like to do the same  control by Python, unfortunately I don't know python& Java a lot,  can't really do it, can anyone help please？

I was actually find some Gradual selection script from forum, but that for Tie point, seems like its not what i wanted, and i also tried remove some tiepoint and re-build model, but the model looks no different with what i did before