Neural Unsupervised Domain Adaptation in NLP–-A Survey
Summary
Ramponi and Plank survey neural methods for unsupervised domain adaptation (UDA) in NLP. In UDA, a model trained on labeled source data must work on a different target distribution where only unlabeled text exists. They argue this setup is harder than supervised DA but much closer to real deployment, since annotating every new target is expensive and does not scale. The survey sorts the literature into three families:
- Model-centric: changes to features, losses, architectures or parameters, such as pivot-based and adversarial approaches.
- Data-centric: pseudo-labeling, data selection and pre-training.
- Hybrid: combinations of the two.
The authors also question what "domain" means in NLP. They propose the broader term "variety," based on Plank's variety space, in which each corpus samples many latent dimensions such as genre, topic and demographics. Their comparative overview finds that sentiment analysis dominates the field and that methods are rarely tested across several tasks. The paper matters because it maps the field, exposes these evaluation gaps, and links UDA to the wider goal of out-of-distribution generalization.
Key points
- The taxonomy (model-centric, data-centric, hybrid) adapts the data/model-centric distinction from Chu and Wang's MT survey and adds a hybrid class. Table 1 maps each method to the tasks it was evaluated on.
- The analysis of Table 1 shows two problems: a column bias toward sentiment benchmarks, and row sparsity, meaning methods are seldom evaluated on multiple tasks.
- Pre-trained transformers (BERT, SciBERT, BioBERT) help adaptation but have known weaknesses:
- they lose accuracy out of domain;
- they are often overconfident;
- fine-tuning is unstable across random seeds and data order (Dodge et al., 2020).
- The authors make three recommendations:
- build multi-task UDA benchmarks that go beyond 1:1 adaptation;
- release unlabeled data from the broader distribution that labeled sets were sampled from;
- publish unaggregated annotations.
- Open problems include X scarcity, where even unlabeled target text is rare (for example, clinical data). A curated reading list accompanies the survey in the awesome-neural-adaptation-in-NLP GitHub repository.
Cited by
- A Survey on Recent Approaches for Natural Language Processing in Low-Resource Scenarios
- A Holistic Approach to Undesired Content Detection in the Real World
Cite
@inproceedings{ramponi2020neural,
title = {{Neural Unsupervised Domain Adaptation in NLP–-A Survey}},
author = {Ramponi, Alan and Plank, Barbara},
booktitle = {Proceedings of the 28th International Conference on Computational Linguistics},
year = {2020},
doi = {10.18653/v1/2020.coling-main.603},
url = {https://doi.org/10.18653/v1/2020.coling-main.603}
}References
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