Multitask learning tutorial and performance improvement #3653
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This was referenced Mar 31, 2025
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This PR adds a tutorial on how to train multitask models in Flair.
It also adds a performance improvement for prediction with trained multitask models, namely that embeddings are re-used between prediction heads. This greatly increases prediction speed (see #3456).
Closes #3632 #3456 #3356 #3224