Hello Mr. @norvig, Mr. @MrDupin, and Mr. @delaray ! I would love to participate to the GSoC 2018 and what's a better start than fixing an issue. Currently the probability.ipnyb does not include any examples and info about the HiddenMarkovModel class and the Forward-Backward algorithm. I have prepared some updates and I will soon ask for a PR.

Regards,

Dimitrios Koimtzoglou