Fix validation checking for u2net models.

Merge remote-tracking branch 'origin/main' into main

v.0.1.7 tested with python <= 3.6

v.0.1.6 Refactor import function download, removing duplicate downloa…

…ds, migrate to gdown for u2net library depencies to close issue nadermx#2

Believe this fixes pytorch issue

Believe this fixed multiprocessing subprocess issue, update release

Believe this fixed multiprocessing subprocess issue, update release

initial