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The pitfalls of next-token prediction

Paper · 2024 · Gregor Bachmann and Vaishnavh Nagarajan

Summary

The authors test whether a model trained only to predict the next token can solve tasks where the answer has to be planned in advance. They propose distinguishing two regimes: autoregressive generation at inference time and training with teacher-forcing. The common criticism about error accumulation applies only to the first regime. It tacitly assumes that training has already produced an accurate next-token predictor. The authors show that in "lookahead" tasks this assumption does not hold. Teacher-forcing lets the model guess later tokens from the already revealed part of the correct answer (Clever Hans cheat). As a result, the model can barely learn the early tokens, which are exactly where planning is needed. To test this, the authors built a minimal path-finding task on a graph that is easy to solve. Yet both the Transformer and Mamba fail on it, even on examples from the same distribution as the training data. Preliminary experiments show that teacherless training eliminates this flaw in some settings. In this approach, the model predicts several future tokens at once and receives dummy tokens as input. The paper provides a clear basis for the discussion of the limits of next-token prediction and for the search for alternative training methods.

Key points

  • The classic example of error accumulation: if the per-token error is 0.01, the probability of at least one error over 200 tokens reaches about 0.86. The authors stress that the failure they describe is different: the model errs right at the start of the answer, not gradually.
  • Two concepts are proposed to describe the training failure: Clever Hans cheat (the model "peeks" at the revealed prefix of the correct answer) and Indecipherable Token failure (early tokens, lacking this hint, become nearly unlearnable).
  • The failure is shown empirically for two architectures: Transformer (Vaswani et al., 2017) and Mamba (Gu & Dao, 2023). Hence the problem lies in the training objective itself, not in the architecture or the generation method. A reversed answer sequence and chain-of-thought-style supervision also help.
  • Teacherless training is borrowed from earlier works where it was used for a different purpose: Monea et al., 2023 ("parallel speculative sampling" for faster inference) and Tschannen et al., 2023. A close analogue from imitation learning is action chunking (Zhao et al., 2023).
  • The paper appeared at ICML 2024 (PMLR 235); the authors are from ETH Zürich and Google Research. The code is openly available in the GitHub repository gregorbachmann/Next-Token-Failures.

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

 Institutions

 Fields, topics and concepts

Cite

Cite as Gregor Bachmann and Vaishnavh Nagarajan. 2024. The pitfalls of next-token prediction. arXiv:2403.06963.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.2403.06963 · arXiv 2403.06963

@misc{bachmann2024pitfalls,
  title = {{The pitfalls of next-token prediction}},
  author = {Gregor Bachmann and Vaishnavh Nagarajan},
  year = {2024},
  doi = {10.48550/arxiv.2403.06963},
  eprint = {2403.06963},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2403.06963}
}

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  108. A. Limitations 1. Our arguments are empirical and conceptual. We have not provided a formal proof for our arguments. 2. We have also not demonstrated failure for very large models such as Llama2 (Touvron et al., 2023) or Mistral (Jiang et al., 2023). find

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