Training of Steering Model doesn't takes speed into account

Hi,
I was just going through the code. In the file train_steering_model.py, the function "gen" yields only the camera frame and the steering angle which is passed to the model.

https://github.com/commaai/research/blob/master/train_steering_model.py#L21

But I was wondering that steering angle position (more importantly the rate of change) does depend on speed.