[docs] last hidden state vs hidden_states[-1] #26142
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ArthurZucker
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Sep 13, 2023
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| When passing `output_hidden_states=True` you may expect the `outputs.hidden_states[-1]` to match `outputs.last_hidden_states` exactly. | ||
| However, this is not always the case. Some models apply normalization to the last hidden state when it's returned. |
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Normalization or subsequent process but yes!
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* last hidden state clarification * feedback addressed
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* last hidden state clarification * feedback addressed
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* last hidden state clarification * feedback addressed
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Intuitively one may think that
output.hidden_states[-1](returned whenoutput_hidden_statesis set toTrue) should match theoutput.last_hidden_statesexactly. However, this is not always the case. Models like CLIP, ClipSeg, GroupVit, OWLViT, and X-CLIP applylayernormbefore returning thelast_hidden_states. Some other models applypost_layernormornorm.This PR adds a small note in the docs to address possible confusion.