why encoder input don't have start token <S>

[Satan012]

No description provided.

[TSLNIHAOGIT]

I think encoder shouldn't have start token and end token ,only decoder need start token and end token

[DaoD]

The start token in decoder is used to generate the first word in response.
There is no need to use a start token in encoder, since the encoder always receive input in both training and prediction process.

[MingLunHan]

Because encoder just extracts information from source language sentence, but when decoder wants to generate a target language sentence, it needs an signal to tell itself to start decoding with some compact representation of collected information, this signal is start token .