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From FusHa to Folk: Exploring Cross-Lingual Transfer in Arabic Language Models

Paper · 2026 · Abdulmuizz Khalak, Abderrahmane Issam and Gerasimos Spanakis

Summary

Arabic language models are mostly pretrained on Modern Standard Arabic (MSA, FusHa) and are expected to work on the spoken dialects (DA), whose distance from MSA varies widely. The authors test whether that expectation holds. They compare MSA-centric, mixed (MIX), multi-dialect (Multi-DA) and single-dialect encoders in two ways. The first is functional: linear probes on frozen layer outputs for POS tagging, NER and sentiment analysis (SA) on dialect datasets, with each model scored at its best layer. The second is structural: layer-wise linear CKA between MSA and DA models, computed on parallel MADAR sentences. Both measures are then related to a geographic distance proxy and to the amount of pretraining data. Transfer from MSA does happen, but it is uneven. It weakens as dialects lie farther away, and the size of this effect depends on how much data a model saw. Pooling all dialects in one model also causes negative interference for well-resourced dialects. The results challenge the assumption that one MSA-based model can serve the whole Arabic continuum.

Key points

  • Three probing tasks are used. POS and NER are probed at the token level, and SA uses mean-pooled sentence vectors fed to a softmax linear classifier.
  • Representational similarity is measured with linear CKA on parallel sentences from the MADAR corpus. Yemen serves as the geographic anchor standing in for MSA.
  • The MSA encoder usually wins on NER and POS. The authors explain this by shared syntax and by dialect speakers code-switching to MSA for named entities. Dialect models tend to win on SA, where idioms, non-standard spelling and negation matter.
  • Dialect-specific models such as EgyBERT and DziriBERT beat general models on high-resource dialects like Egyptian and Saudi. General models win on low-resource ones like Lebanese and Jordanian.
  • DziriBERT shows high CKA similarity to MSA without a matching advantage in probing. This gap between structural and functional similarity echoes Davari et al. (2023).
  • No Gulf NER dataset existed, so the authors created proxy labels on MADAR with an existing NER model. Regional datasets were divided by country using automatic dialect identification.

Interesting ideas

  • I1. Pair an extrinsic test (probing accuracy) with an intrinsic one (CKA on parallel input), and treat any disagreement as a finding, since high similarity need not mean useful features.
  • I2. Model language varieties as a continuum with a measurable distance from an anchor, then check whether transfer performance falls off along that distance.
  • I3. Break results down by task type to find where a shared standard carries over: syntax and entities transfer well, while sentiment, idioms and negation do not.
  • I4. When gold labels are missing for a variety, run an existing model over a parallel corpus to make proxy labels, and state the noise this adds.
  • I5. Mixing many varieties can hurt the well-resourced ones, so the authors suggest region-specific parameters.

For Mova

How these ideas could serve Mova, our small open language model — its files, stages and tests:

  • I1 (learn): When comparing witness parsers, report how much their internal representations agree separately from how well they score on tasks. A parser that looks similar to the others but adds no task value should not count as an independent witness.
  • I2 (tree): Order English genres or dialects (news, forum text, transcribed speech, older prose) by their distance from the main training treebank. Then plot how parser LAS degrades along that ordering to decide where UD dialect conversion or extra treebanks are most needed.
  • I3 (frames): Expect the tree layer to transfer across registers more easily than pragmatics. Give irony, negation scope and idiom handling in prag their own register-specific tests instead of assuming parser robustness is enough.
  • I4 (learn): Silver data built this way should be marked by its origin and checked against negative controls. That way, any gains measured on proxy-labelled slices are not mistaken for real improvements.
  • I5 (learn): Before folding new domains into one parser model, compare per-domain scores against a single-domain baseline. Where interference appears, add small domain-specific components.

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 Abdulmuizz Khalak, Abderrahmane Issam and Gerasimos Spanakis. 2026. From FusHa to Folk: Exploring Cross-Lingual Transfer in Arabic Language Models. arXiv:2602.09826.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.2602.09826 · arXiv 2602.09826

@misc{khalak2026fusha,
  title = {{From FusHa to Folk: Exploring Cross-Lingual Transfer in Arabic Language Models}},
  author = {Abdulmuizz Khalak, Abderrahmane Issam and Gerasimos Spanakis},
  year = {2026},
  doi = {10.48550/arxiv.2602.09826},
  eprint = {2602.09826},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2602.09826}
}

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