Quadcopter UAV windfield training

As this link Quadcopter UAV wind disturbance training - #2 by rbaltman says, so how should I implement reinforcement learning training in python for a quadcopter under a wind field?

I tried to write the wind field in the quadcopter reinforcement learning demo, but from the first sentence:

from pxr import PhysxSchema 

produces a ModuleNotFound Error:

no module name 'pxr'

Is there any kind and good person who can teach me, I appreciate it!