def rollout(self, **args):
    " Return a list of dicts containing instr_id:'xx', path:[(viewpointId, heading_rad, elevation_rad)]  "
    raise NotImplementedError
Return a list of dicts containing instr_id:'xx', path:[(viewpointId, heading_rad, elevation_rad)]
def rollout(self, **args):
    "   "
    raise NotImplementedError