Function of `update_obs` in the `fit_sslm` method.

[bhargavvader]

Hello, I was trying to play around with the update_obs method and was stuck at the optimize_fdf method (line 1170.)

I understand the idea is to update obs, but as the forward-backward algorithm (compute_post_mean) is called in the functions, won't the process of optimizing have side effects on the mean values? Is this intended?

Any help on how to better understand this function and step would be greatly appreciated!