A transformer emits one vector per token, but retrieval needs one vector per text. The signal is knowing the pooling options and the catch that almost everyone misses: the model has to be trained for whichever one you pick.
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
A transformer emits one vector per token, but retrieval needs one vector per text. The signal is knowing the pooling options and the catch that almost everyone misses: the model has to be trained for whichever one you pick.
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