How to push robot when playing？

  I only deleted the code that cfg.events.pop("push_robot", None)：
if play:
    # Effectively infinite episode length.
    cfg.episode_length_s = int(1e9)
    cfg.observations["actor"].enable_corruption = False
    #cfg.events.pop("push_robot", None)
But during play, the robot did not receive external force.
But during train，the robot is pushed.
