How to get those models?

[Sherman62]

Thanks for your excellent job! But where can i get PyCeresIK，or those submodules contained in .gitmodule file ? I find the the libraries package is not available https://github.com/FORTH-ModelBasedTracker/MonocularRGB_3D_Handpose_WACV18/blob/master/lib/README.md .
Thanks!