ddpg pmsm dq current control array dimension problem

[berkhizarci]

When I tried to run the ddpg_pmsm_dq_current_control inside the examples I got the following error:

ValueError: Error when checking input: expected flatten_input to have shape (1, 7) but got array with shape (1, 2)

I fixed the wrong module version problems but I couldnt fix it, what do I need to do to fix it?

[bhk11]

Hello berkhizarci,
Unfortunately, the examples in the last version were not updated to the new gymnasium interface of the gym-electric-motor package.

I tried updating the interface in the wrapper (see the code), but that ended in another error for me. Maybe this change will help you:

class AppendLastActionWrapper(Wrapper):
    
   def __init__(self, environment):
        super().__init__(environment)
        # append the action space dimensions to the observation space dimensions
        self.observation_space = Tuple((Box(
            np.concatenate((environment.observation_space[0].low, environment.action_space.low)),
            np.concatenate((environment.observation_space[0].high, environment.action_space.high))
        ), environment.observation_space[1]))

    def step(self, action):

        (state, ref), rew, term, trun, info = self.env.step(action)

        # extend the output state by the selected action
        state = np.concatenate((state, action))

        return (state, ref), rew, term, info

    def reset(self, **kwargs):

        (state, ref), info = self.env.reset()

        # extend the output state by zeros after reset
        # no action can be appended yet, but the dimension must fit
        state = np.concatenate((state, np.zeros(self.env.action_space.shape)))

        return state, ref

Another workaround could be to install an older package, e.g. pip install gym-electric-motor==1.1.0, which uses the classic Gym interface.

The reason I am keeping my effort low to solve your problem is that the rl lib used, keras-rl, has not been maintained for a long time and therefore does not support the latest gym/gymnasium interface, which gym-electric-motor uses. This can lead to errors when maintaining this example. In addition, we are currently working on a new version with working examples, in which this example will be replaced by an stable baselines 3 ddpg.

[bhk11]

examples updated in the nightly with pull request #253