Automatic Annotation of Grammaticality in Child-Caregiver Conversations
Summary
The authors developed a tool that automatically assesses the grammaticality of children's utterances in naturalistic conversations between children and adults. Until now, such research has relied on labor-intensive manual coding of small samples. As a result, conclusions about grammar acquisition, in particular about the benefit of parental corrections, have often contradicted one another. The team designed an annotation scheme that takes the dialogue context into account: elliptical answers, repetitions and self-corrections are assessed with reference to the preceding turns. Following this scheme, more than 4,000 utterances from the English portion of CHILDES were manually annotated. For ungrammatical utterances, the error type was additionally specified. On these data, an SVM on n-grams, an LSTM and fine-tuned Transformer models were compared. The Transformer models performed best: their results nearly reached the level of inter-annotator agreement among humans. The trained models were then run on a corpus roughly a hundred times the size of the annotated set. This confirmed the expected gradual increase in grammaticality with age. The work shows that modern NLP methods make it possible to study children's language development at scale and reproducibly.
Key points
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Data: more than 4,000 child utterances (at least two words long) from English CHILDES carry one of three labels: grammatical, ambiguous or ungrammatical. Ungrammatical utterances are further divided into more than a dozen error categories, among them subject omission.
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Models: several approaches were compared:
- a baseline SVM on n-gram features (BPE, without context);
- a single-layer LSTM with 512 hidden units, pre-trained as a language model on CHILDES;
- fine-tuned BERT (bert-base-uncased), GPT2, RoBERTa (roberta-large) and DeBERTa (deberta-v3-large).
To let the models distinguish between speakers, the special tokens [CHI] and [CAR] were prepended to each turn.
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Result: the fine-tuned Transformer models outperformed the baselines and nearly matched human annotators in quality.
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Application: the models automatically annotated all English CHILDES transcripts for children aged 2–5 years. The proportion of grammatical utterances increases steadily with age.
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Resources: the annotations, models and code are openly released on GitHub (mitjanikolaus/childes-grammaticality). The paper is distributed under the CC BY-NC 4.0 license.
Cite
Cite as Mitja Nikolaus, Abhishek Agrawal, Petros Kaklamanis, Alex Warstadt and Abdellah Fourtassi. 2024. Automatic Annotation of Grammaticality in Child-Caregiver Conversations. Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024).
@inproceedings{nikolaus2024automatic,
title = {{Automatic Annotation of Grammaticality in Child-Caregiver Conversations}},
author = {Mitja Nikolaus, Abhishek Agrawal, Petros Kaklamanis, Alex Warstadt and Abdellah Fourtassi},
booktitle = {Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024)},
year = {2024},
eprint = {2403.14208},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2403.14208}
}References
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