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What does Dart do that a multibillion dollar entity with an excellent open sourcing track record misses doing? Perhaps it addresses a niché case well. Genuinely curious

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Darts isn't a specific model, it's a wrapper API for a wide variety of forecasting models, and Prophet is one of them. Other models may or may not outperform Prophet depending on the nature of your specific application and your time series data. You really have to test them to know. And Darts facilitates testing many models on the same data by putting them all behind the same API.

Also, Prophet was developed by a very small number of individuals at Facebook, it's not something they invested massive resources into.

As others have mentioned in the thread, Prophet has been abandoned, and in my experience anyway, wasn't all that great.

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