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Q&A Why would the tokenizer for encoder-decoder model for machine translation use bos_token_id == eos_token_id? How does it know when a sequence ends?

In encoder-decoder models for machine translation, it's not uncommon for the bos_token_id (beginning of sequence) and eos_token_id (end of sequence) to be set to the same value. This approach is m...

posted 17h ago by Willyilderman‭  ·  edited 17h ago by Willyilderman‭

Answer
#2: Post edited by user avatar Willyilderman‭ · 2025-05-12T14:06:26Z (about 17 hours ago)
  • In encoder-decoder models for machine translation, it's not uncommon for the bos_token_id (beginning of sequence) and eos_token_id (end of sequence) to be set to the same value.
  • This approach is mostly fine in decoder-only or decoder-side generation tasks, but in more complex pipelines or for clarity, keeping bos_token_id and eos_token_id separate is generally preferred.
  • I believe so.
  • In encoder-decoder models for machine translation, it's not uncommon for the bos_token_id (beginning of sequence) and eos_token_id (end of sequence) to be set to the same value.
  • This approach is mostly fine in decoder-only or decoder-side generation tasks, but in more complex pipelines or for clarity, keeping bos_token_id and eos_token_id separate is generally preferred.
  • I believe so.
  • Edit by: "[Block Blast](https://blockblast.org)"
#1: Initial revision by user avatar Willyilderman‭ · 2025-05-12T14:05:42Z (about 17 hours ago)
In encoder-decoder models for machine translation, it's not uncommon for the bos_token_id (beginning of sequence) and eos_token_id (end of sequence) to be set to the same value.
This approach is mostly fine in decoder-only or decoder-side generation tasks, but in more complex pipelines or for clarity, keeping bos_token_id and eos_token_id separate is generally preferred.
I believe so.