`get_conn` should throw an error on wrong input size
*Created by: PhilipVinc* Currently get_conn does no input shape validation and then reshapes the input carelessly. So if you give it a batch of states, which is not supported, he gives back garbage becase ``` def get_conn return self.get_conn_flattened( x.reshape((1, -1)), np.ones(1), ) ```
issue