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Time Waits for No One! Analysis and Challenges of Temporal Misalignment

Paper · 2022 · Kelvin Luu, Daniel Khashabi, Suchin Gururangan et al.

Summary

The paper examines temporal misalignment, the situation in which the text used to train an NLP model and the text it is evaluated or deployed on come from different periods. The authors build a benchmark of eight timestamped tasks from four domains: Twitter, scientific articles, news, and food reviews. Each task covers at least five years. They use a standard pipeline in which GPT-2 is pretrained, optionally adapted to a domain or time period (DAPT), and then finetuned on a task. To isolate the effect of time, they hold the test period fixed, vary the training period, and keep training sets the same size. They also propose the TD score, which estimates how much performance drops per unit of time gap. Degradation turns out to be stronger than earlier work reported, and it differs widely between tasks, even within a single domain. Continued pretraining on unlabeled text from the target period helps only slightly. Finetuning on labeled data from that period helps much more. The practical lesson is that temporal adaptation cannot replace fresh annotations, and benchmarks whose train and test data come from the same period may overstate real-world performance.

Key points

  • Benchmark: eight tasks across four domains, three of them newly defined by the authors.
    • Examples include political affiliation of tweets (PoliAff), Twitter entity typing (TwiERC), publisher classification, summarization, and review rating classification.
    • Roughly 12M unlabeled tweets from 2015–2020 were gathered for temporal adaptation.
  • TD score: for each test period, a least-squares line is fitted to a sign-adjusted performance gap plotted against training period. The line's slope gives the degradation rate, and these slopes are averaged across test periods.
  • Size of the effect: over five years, F1 fell by about 40 points for political affiliation on Twitter but only about 1 point for Yelp review ratings.
  • Temporal adaptation vs. finetuning: continued GPT-2 pretraining on data from the target period produced small gains compared with finetuning on labeled data from that period. This agrees with Röttger and Pierrehumbert (2021) and extends their findings to more tasks and longer time spans.
  • Language model drift: GPT-2 perplexity also rises as the gap between training and evaluation periods grows, and the size of that rise depends on the domain.

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

Cite

Cite as Kelvin Luu, Daniel Khashabi, Suchin Gururangan, Karishma Mandyam and Noah A. Smith. 2022. Time Waits for No One! Analysis and Challenges of Temporal Misalignment. Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.18653/v1/2022.naacl-main.435

@inproceedings{luu2022time,
  title = {{Time Waits for No One! Analysis and Challenges of Temporal Misalignment}},
  author = {Kelvin Luu, Daniel Khashabi, Suchin Gururangan, Karishma Mandyam and Noah A. Smith},
  booktitle = {Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies},
  year = {2022},
  doi = {10.18653/v1/2022.naacl-main.435},
  url = {https://doi.org/10.18653/v1/2022.naacl-main.435}
}

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