Language acquisition: do children and language models follow similar learning stages?

Linnea Evanson, Yair Lakretz, Jean Rémi King


Abstract
During language acquisition, children follow a typical sequence of learning stages, whereby they first learn to categorize phonemes before they develop their lexicon and eventually master increasingly complex syntactic structures. However, the computational principles that lead to this learning trajectory remain largely unknown. To investigate this, we here compare the learning trajectories of deep language models to those of human children. Specifically, we test whether, during its training, GPT-2 exhibits stages of language acquisition comparable to those observed in children aged between 18 months and 6 years. For this, we train 48 GPT-2 models from scratch and evaluate their syntactic and semantic abilities at each training step, using 96 probes curated from the BLiMP, Zorro and BIG-Bench benchmarks. We then compare these evaluations with the behavior of 54 children during language production. Our analyses reveal three main findings. First, similarly to children, the language models tend to learn linguistic skills in a systematic order. Second, this learning scheme is parallel: the language tasks that are learned last improve from the very first training steps. Third, some – but not all – learning stages are shared between children and these language models. Overall, these results shed new light on the principles of language acquisition, and highlight important divergences in how humans and modern algorithms learn to process natural language.
Anthology ID:
2023.findings-acl.773
Volume:
Findings of the Association for Computational Linguistics: ACL 2023
Month:
July
Year:
2023
Address:
Toronto, Canada
Editors:
Anna Rogers, Jordan Boyd-Graber, Naoaki Okazaki
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
12205–12218
Language:
URL:
https://aclanthology.org/2023.findings-acl.773
DOI:
10.18653/v1/2023.findings-acl.773
Bibkey:
Cite (ACL):
Linnea Evanson, Yair Lakretz, and Jean Rémi King. 2023. Language acquisition: do children and language models follow similar learning stages?. In Findings of the Association for Computational Linguistics: ACL 2023, pages 12205–12218, Toronto, Canada. Association for Computational Linguistics.
Cite (Informal):
Language acquisition: do children and language models follow similar learning stages? (Evanson et al., Findings 2023)
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PDF:
https://aclanthology.org/2023.findings-acl.773.pdf
Video:
 https://aclanthology.org/2023.findings-acl.773.mp4