def forward_dynamics(self, action):
        self.model.data.ctrl = self.inject_action_noise(action)
        for _ in range(self.frame_skip):
            self.model.step()
        self.model.forward()
        new_com = self.model.data.com_subtree[0]
        self.dcom = self.current_com - new_com
        self.current_com = new_com
dataset/ETHPy150Open rllab/rllab/rllab/envs/mujoco/mujoco_env.py/MujocoEnv.forward_dynamics/swapped operands of `-`