What do you mean by "optional"?. You are including it [2] [3] [4] as one of the options (not re-implementation of the original paper [1]) and it is one of the d

What do you mean by "optional"?. You are including it [2] [3] [4] as one of the options (not re-implementation of the original paper [1]) and it is one of the dependencies [4] (Prophet [5] is an open-source library built by facebook research). I think we should distinguish between science/open-source and policies when we mention open-source projects. *References*: [1]: https://facebook.github.io/prophet/#:~:text=Prophet%20is%20a%20procedure%20for,several%20seasons%20of%20historical%20data https://facebook.github.io/prophet/#:~:text=Prophet%20is%20a.... [2]: https://github.com/unit8co/darts/blob/master/darts/models/prophet.py#L13 https://github.com/unit8co/darts/blob/master/darts/models/pr... [3]: https://github.com/unit8co/darts/blob/master/setup.py#L12 https://github.com/unit8co/darts/blob/master/setup.py#L12 [4]: https://github.com/unit8co/darts/blob/master/requirements/prophet.txt https://github.com/unit8co/darts/blob/master/requirements/pr... [5]: https://github.com/facebook/prophet https://github.com/facebook/prophet