remove one_hot, first try

Right, either we return it here, and then use it in the call to `super(EmotionsDataset, self).__init__`, or we directly pass `7` to that call.
But currently, this would fail, because you added a new return value to `_load_data`, but it is not expected when `_load_data` is called. I think the easiest way is to revert the change to `_load_data`, and pass `y_labels=7` to `....__init__`.