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[GH-ISSUE #50] ollama Model is configured wrong: Double BOS #49

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opened 2026-10-26 21:07:36 +00:00 by bsakaguchi · 2 comments
bsakaguchi commented 2026-10-26 21:07:36 +00:00
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Originally created by @Snowman-25 on GitHub (Sep 19, 2024).
Original GitHub issue: https://github.com/deepseek-ai/DeepSeek-Coder-V2/issues/50

Whenever I run deepseek-coder-v2:latest through ollama, the following Error pops up in the log for each prompt:

llm_tokenizer_bpe::check_double_bos_eos: Added a BOS token to the prompt as specified by the model but the prompt also starts with a BOS token. So now the final prompt starts with 2 BOS tokens. Are you sure this is what you want?

I believe that this is due to tokenizer.ggml.add_bos_token being set to true but the template also already having a <｜begin▁of▁sentence｜> token.

I'm not sure how this affects hallucinations of the model

Originally created by @Snowman-25 on GitHub (Sep 19, 2024). Original GitHub issue: https://github.com/deepseek-ai/DeepSeek-Coder-V2/issues/50 Whenever I run `deepseek-coder-v2:latest` through `ollama`, the following Error pops up in the log for each prompt: ``` llm_tokenizer_bpe::check_double_bos_eos: Added a BOS token to the prompt as specified by the model but the prompt also starts with a BOS token. So now the final prompt starts with 2 BOS tokens. Are you sure this is what you want? ``` I believe that this is due to `tokenizer.ggml.add_bos_token` being set to `true` but the template also already having a `<｜begin▁of▁sentence｜>` token. I'm not sure how this affects hallucinations of the model
bsakaguchi commented 2026-10-26 21:07:37 +00:00
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@Arvin2focus commented on GitHub (Jan 21, 2025):

same issue for me, any update?

<!-- gh-comment-id:2603916140 --> @Arvin2focus commented on GitHub (Jan 21, 2025): same issue for me, any update?
bsakaguchi commented 2026-10-26 21:07:37 +00:00
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@jianjunchang commented on GitHub (Oct 13, 2025):

same issue for me

<!-- gh-comment-id:3395691049 --> @jianjunchang commented on GitHub (Oct 13, 2025): same issue for me
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