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Hmm maybe. Turns out the author trained a logistic-regression classifier on the embeddings too, but didn't report the results:

Expanding on this experiment using logistic regression is an interesting continuation, detailed here: https://www.teachmecoolstuff.com/viewarticle/using-logistic-...

In summary: Using logistic regression actually improves accuracy, but also performance during both runtime and during training.

Is that overfitted?

Do 5-fold cross validation, maybe stratified.

It's the same dataset as the original experiment, but could be interesting to dig into it more.