Fix optimizer not being pickled

pavlin-policar / openTSNE

Extensible, parallel implementations of t-SNE

https://opentsne.rtfd.io

BSD 3-Clause "New" or "Revised" License

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Closed pavlin-policar closed 3 years ago

pavlin-policar commented 3 years ago

Optimizer wasn't being pickled, resetting the gains on unpickle.

Implement proper pickling.