The beta values are generated using a cosine function. The beta values are
clipped between 0.0001 and 0.9999.
Parameters:
timesteps (int) – The number of timesteps which will be used to generate the beta values.
s (float, optional) – Adjusts the smoothness of the beta schedule’s initial portion, influencing
how quickly the values change over the first few timesteps. By default 0.008.