[ML] add text_similarity task support #486
Merged
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Adds text_similarity task support. This is a cross-encoder transformer task where both sequences are given to the transformer at once.
According to 🤗 (or at least how the cross-encoder models are concerned) this is a sequence classification task with just one classification "label". But really, it isn't labeled at all and is more akin to a regression model.
related: elastic/elasticsearch#88439