NVIDIA/Megatron-LM

[BUG] GPT2BPETokenizer (and possibly others) missing decode and offsets methods

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#1,633 opened on Jun 13, 2025

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bugcommunity-requestgood first issuemodule: data pipelinewaiting-on-customer

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Description

I've encountered an issue when running text generation with Megatron-LM. Apologies in advance if there are any mistakes — I'm a new user.

After successfully preprocessing the data using:

python tools/preprocess_data.py --tokenizer-type GPT2BPETokenizer

and completing pretraining, I tried running text generation using:

tools/run_text_generation_server.py

However, I received the following errors:

AttributeError: '_GPT2BPETokenizer' object has no attribute 'decode'
AttributeError: '_GPT2BPETokenizer' object has no attribute 'offsets'

These errors seem to originate from:

It seems like _GPT2BPETokenizer may be missing decode and offsets methods required by the inference script. Any guidance on how to resolve this would be greatly appreciated.

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