The answer
Usually it is part of the model itself. Tokenization is a separate preprocessing stage, while the learned embedding lookup participates in the neural network’s computation.
Why are text inputs converted into embeddings before entering a neural network?
Is the embedding layer outside the language model?
More FAQs in Why are text inputs converted into embeddings before entering a neural network?
One-hot vectors identify vocabulary entries but are sparse and do not directly encode learned relationships. Dense embeddings provide a practical representation for subsequent neural computations.
A basic token lookup vector does not. Later contextual layers incorporate the available sequence, so the same initial vector can contribute to different representations in different sentences.
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