Challenge: Existing tools for word segmentation are based on different linguistic theories or target different scenarios.
Approach: They propose a probabilistic toolkit for multi-grained word segmentation in Chinese . they adopt semi-Markov CRF for single-grain word segmenting (SWS) .
Outcome: The proposed approach can produce marginal probabilities of words during inference and significantly improve performance in the cross-domain scenario.

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Multi-grained Chinese Word Segmentation with Weakly Labeled Data (2020.coling-main)

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Challenge: Existing work on single-grained word segmentation (SWS) focuses on segmenting a sentence into multiple word sequences to preserve all words of different granularities.
Approach: They propose to use a graph-based parser to accommodate weakly labeled data for MWS by employing a simple yet competitive graph-basic parsers with local loss.
Outcome: The proposed model outperforms the state-of-the-art model on weakly labeled data on a high-quality dataset from canonical newswire (NEWS) and non-canonical web (BAIKE) data.
CWSeg: An Efficient and General Approach to Chinese Word Segmentation (2023.acl-industry)

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Challenge: Existing methods for Chinese word segmentation have achieved state-of-the-art performance, but they pose challenges in the deployment.
Approach: They propose to augment PLM-based Chinese word segmentation schemes by developing cohort training and versatile decoding strategies.
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Advancing Multi-Criteria Chinese Word Segmentation Through Criterion Classification and Denoising (2023.acl-long)

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Challenge: Recent research on multi-criteria Chinese word segmentation focuses on building complex private structures, adding more handcrafted features, or introducing complex optimization processes.
Approach: They propose a model that fits multiple Chinese word segments using input-hint inputs.
Outcome: The proposed model achieves state-of-the-art (SoTA) performance on multiple datasets simultaneously.
Mining Word Boundaries from Speech-Text Parallel Data for Cross-domain Chinese Word Segmentation (2025.coling-main)

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Challenge: Recent studies on Chinese Word Segmentation (CWS) have focused on the cross-domain scenarios, but there is a high cost of manually annotating high-quality data.
Approach: They propose to explicitly mine word boundaries from parallel speech-text data by using the Montreal Forced Aligner toolkit to perform character-level alignment on speech- text data.
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Unsupervised Neural Word Segmentation for Chinese via Segmental Language Modeling (D18-1)

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Challenge: Existing approaches to unsupervised Chinese word segmentation (CWS) are discriminative and generative, but they are non-trivial.
Approach: They propose a neural generative model for fully unsupervised Chinese word segmentation (CWS) their approach explicitly focuses on the segmental nature of Chinese, and preserves several properties of language models.
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RethinkCWS: Is Chinese Word Segmentation a Solved Task? (2020.emnlp-main)

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Challenge: Recent years have seen remarkable success in the use of deep neural networks on Chinese word segmentation (CWS) however, the performance of CWS systems has gradually reached a plateau with the rapid development of deep networks.
Approach: They propose a fine-grained evaluation for existing Chinese word segmentation systems that allows us to diagnose the strengths and weaknesses of existing models.
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Improving Chinese Named Entity Recognition with Multi-grained Words and Part-of-Speech Tags via Joint Modeling (2024.lrec-main)

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Challenge: Named entity recognition (CNER) is a fundamental task in natural language processing (NLP).
Approach: They propose a tree parsing approach for jointly modeling Chinese named entity recognition (CNER) with multi-grained word segmentation (MWS) and POS tagging tasks.
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Improving Multi-Criteria Chinese Word Segmentation through Learning Sentence Representation (2023.findings-emnlp)

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Challenge: Recent Chinese word segmentation models tend to learn the segmentation knowledge through in-vocabulary words rather than understanding the meaning of the entire context.
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A Pragmatic Approach for Classical Chinese Word Segmentation (L18-1)

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Challenge: Classical Chinese word segmentation is largely neglected due to its obsoleteness . a new approach to segmentation using a marked-up corpus is needed .
Approach: They propose a pragmatic approach to deal with Classical Chinese word segmentation without any marked-up corpus.
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Segment, Mask, and Predict: Augmenting Chinese Word Segmentation with Self-Supervision (2021.emnlp-main)

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Challenge: Recent state-of-the-art (SOTA) effective neural network methods have been used in Chinese word segmentation (CWS) However, the robustness of the previous neural methods is limited by the large-scale annotated corpus.
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