Papers by Shuming Liu

52 papers
A Survey on Zero Pronoun Translation (2023.acl-long)

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Challenge: Zero pronouns (ZPs) are often omitted in pro-drop languages, but should be recalled in non-pro-drop language.
Approach: They propose to analyze the literature on zero pronoun translation after the neural revolution . they uncover that data limitation causes learning bias in languages and domains .
Outcome: The proposed method and methods are compared to other models and evaluation metrics on different benchmarks.
Rethinking Negative Sampling for Handling Missing Entity Annotations (2022.acl-long)

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Challenge: Empirical studies show low missampling rate and high uncertainty are both essential for achieving promising performances with negative sampling.
Approach: They propose an adaptive and weighted sampling distribution that further improves negative sampling by introducing missampling and uncertainty concepts.
Outcome: The proposed approach improves on synthetic and well-annotated datasets in terms of F1 score and loss convergence.
IMTLab: An Open-Source Platform for Building, Evaluating, and Diagnosing Interactive Machine Translation Systems (2023.emnlp-main)

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Challenge: Existing systems that use a left-to-right completion paradigm are inefficient and expensive.
Approach: They propose an open-source end-to-end interactive machine translation system platform . they propose to use a prefix-constrained decoding approach to achieve end- to-end evaluation .
Outcome: The proposed system can guarantee high-quality, error-free translations . it uses prefix-constrained decoding and improves on previous systems .
Discourse-Centric Evaluation of Document-level Machine Translation with a New Densely Annotated Parallel Corpus of Novels (2023.acl-long)

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Challenge: Several recent papers claim to have achieved human parity at sentence-level machine translation.
Approach: They propose to use a dataset with rich discourse annotations to evaluate MT performance . they find that MT outputs differ fundamentally from human translations in terms of latent discourse structures.
Outcome: The proposed dataset builds upon the large-scale parallel corpus BWB . it covers 15,095 entity mentions in both languages and compares them to human translations .
Retrieval-guided Dialogue Response Generation via a Matching-to-Generation Framework (D19-1)

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Challenge: generative models for end-to-end sequence generation have been shown promising for this task . however, how to precisely extract a skeleton and how to effectively train a retrieval-guided response generator is still challenging.
Approach: They propose a framework where skeleton extraction is made by an interpretable matching model and a retrieval-guided response generator is followed by a separate generator.
Outcome: The proposed framework outperforms baseline models in a variety of experiments.
TexSmart: A System for Enhanced Natural Language Understanding (2021.acl-demo)

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Challenge: TexSmart supports fine-grained named entity recognition (NER) Large-scale fine-granular entity types are expected to provide richer semantic information for downstream NLP applications.
Approach: They introduce TexSmart, a text understanding system that supports fine-grained named entity recognition (NER) and enhanced semantic analysis functionalities.
Outcome: The proposed system supports fine-grained named entity recognition (NER) and enhanced semantic analysis functions.
GWLAN: General Word-Level AutocompletioN for Computer-Aided Translation (2021.acl-long)

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Challenge: Computer-aided translation (CAT) is a form of software that assists a human translator in the translation process.
Approach: They propose to use computer-aided translation (CAT) to assist a human translator in the translation process.
Outcome: The proposed method can give significantly more accurate predictions than baseline methods on CAT datasets.
Evaluating Explanation Methods for Neural Machine Translation (2020.acl-main)

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Challenge: Neural machine translation (NMT) has seen great success during recent years.
Approach: They propose a metric that measures the fidelity of explanation methods on translation tasks . they use an efficient approximation to evaluate several explanation methods .
Outcome: The proposed metric is efficient and can be used on translation tasks.
On the Branching Bias of Syntax Extracted from Pre-trained Language Models (2020.findings-emnlp)

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Challenge: Existing methods for extracting constituency trees from language models suffer from branching bias.
Approach: They propose to measure the branching bias by comparing the performance gap on a language and its reversed language.
Outcome: The proposed method is agnostic to language models and extracting methods, and it can be implemented with three factors to introduce the branching bias.
Learning from Sibling Mentions with Scalable Graph Inference in Fine-Grained Entity Typing (2022.acl-long)

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Challenge: Existing models struggle to handle hard mentions due to insufficient contexts, limiting their overall typing performance.
Approach: They propose to exploit sibling mentions to enhance the mention representations by adding unseen test mentions as new nodes for inference.
Outcome: The proposed model outperforms ten strong baseline models and outperformed strong baselines.
Mixture of Heterogeneous Grouped Experts for Language Modeling (2026.acl-industry)

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Challenge: Large Language Models (LLMs) based on Mixture-of-Experts (MoE) enforce uniform expert sizes, creating a rigidity that fails to align computational costs with varying token-level complexity.
Approach: They propose a mixture of heterogeneous grouped experts (MoHGE) that allows for flexible, resource-aware expert combinations.
Outcome: The proposed model matches the performance of existing Mixture-of-Experts architectures while maintaining balanced GPU utilization.
Automatic Article Commenting: the Task and Dataset (P18-2)

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Challenge: Existing methods to make comments on articles are based on human-annotated subsets, but they are not suitable for online forums.
Approach: They propose to use a large-scale Chinese corpus with millions of real comments and a human-annotated subset characterizing the comments’ varying quality to generalize a broad set of popular reference-based metrics.
Outcome: The proposed model incorporates human-annotated subset characterizing the comments’ varying quality and shows that it is more accurate than previous models.
A Simple yet Efficient Prompt Compression Method for Text Classification Data Annotation Using LLM (2025.coling-industry)

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Challenge: Existing methods to improve the accuracy of large language models (LLMs) are often impractical due to high costs and time consumption.
Approach: They propose a method that uses keyword extraction to reduce prompt tokens in text annotation tasks.
Outcome: The proposed method reduces prompt tokens while maintaining high accuracy.
BiTIIMT: A Bilingual Text-infilling Method for Interactive Machine Translation (2022.acl-long)

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Challenge: Existing IMT systems relying on lexical constrained decoding (LCD) are limited in translation efficiency and quality due to LCD.
Approach: They propose a novel interactive neural machine translation system that uses lexical constraints to decode missing words in a manually revised translation.
Outcome: The proposed system performs significantly better and faster than state-of-the-art IMT on three translation tasks.
MCPG: A Flexible Multi-Level Controllable Framework for Unsupervised Paraphrase Generation (2022.findings-emnlp)

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Challenge: Existing studies on controllable unsupervised paraphrase generation are expensive and require supervised training on large parallel corpora.
Approach: They propose a method for controllable unsupervised paraphrase generation that is flexible to adapt to specific domains without extra training.
Outcome: The proposed method outperforms state-of-the-art unsupervised baselines by a margin.
Towards Less Generic Responses in Neural Conversation Models: A Statistical Re-weighting Method (D18-1)

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Challenge: Experimental results show that Sequence-to-sequence models tend to generate generic/dull responses .
Approach: They propose a statistical re-weighting method that assigns different weights for multiple responses of the same query.
Outcome: The proposed method improves acceptance rate of generated responses and significantly reduces generated generic responses.
Towards Efficient Dialogue Pre-training with Transferable and Interpretable Latent Structure (2022.emnlp-main)

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Challenge: Existing models that use millions of parameters on massive data are inefficient and lack interpretability.
Approach: They propose a model with a latent structure that is easily transferable from the general domain to downstream tasks in a lightweight and transparent way.
Outcome: The proposed model performs better than four strong baseline models in terms of automatic and human evaluations and is 5x faster than the strongest baseline model.
An Empirical Study on Multiple Information Sources for Zero-Shot Fine-Grained Entity Typing (2021.emnlp-main)

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Challenge: Auxiliary information from multiple sources has been demonstrated to be effective in zero-shot fine-grained entity typing (ZFET) however, there is no comprehensive understanding of how to make better use of the existing information sources and how they affect the performance of ZFET.
Approach: They propose a multi-source fusion model targeting auxiliary information from multiple sources to improve zero-shot fine-grained entity typing (ZFET)
Outcome: The proposed model achieves 11.42% and 22.84% gains over state-of-the-art baselines on BBN and Wiki respectively with regard to macro F1 scores.
Advancement in Graph Understanding: A Multimodal Benchmark and Fine-Tuning of Vision-Language Models (2024.acl-long)

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Challenge: Graph data organizes complex relationships and interactions between objects . Graph neural networks (GNNs) are becoming more popular in graph learning .
Approach: They propose a new paradigm for interactive and instructional graph data understanding and reasoning . they first evaluate the capabilities of public VLMs in graph learning from multiple aspects .
Outcome: The proposed model achieves an accuracy increase of 5%-15% compared to baseline models . the best-performing model achieve scores comparable to Gemini in GPT-asissted Evaluation .
GuoFeng: A Benchmark for Zero Pronoun Recovery and Translation (2022.emnlp-main)

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Challenge: ZPs are often omitted when they can be pragmatically or grammatically inferred from intraand inter-sentential contexts.
Approach: They propose a benchmark testset for target evaluation on Chinese-English ZP translation.
Outcome: The proposed testset covers five genres and identifies current challenges for evaluation.
On the Copying Behaviors of Pre-Training for Neural Machine Translation (2021.findings-acl)

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Challenge: Existing studies show that initializing NMT models with pre-trained language models (LM) can speed up the model training and boost the model performance.
Approach: They propose a method to control copying behaviors in NMT models by initializing them with pre-trained language models (LM) they propose to use a metric called copy ratio to control the copying behavior in decoding.
Outcome: The proposed method improves translation performance by controlling copying behaviors for pre-training based models.
On the Word Alignment from Neural Machine Translation (P19-1)

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Challenge: Prior researches suggest that neural machine translation (NMT) captures word alignment through its attention mechanism, however, attention may fail to capture word alignment for some NMT models.
Approach: They propose two methods to induce word alignment which are general and agnostic to specific NMT models.
Outcome: The proposed methods induce much better word alignment than attention.
TextBind: Multi-turn Interleaved Multimodal Instruction-following in the Wild (2024.findings-acl)

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Challenge: Large language models with instruction-following capabilities have revolutionized the field of artificial intelligence.
Approach: They propose an annotation-free framework for empowering large language models with instruction-following capabilities.
Outcome: The proposed framework generates multi-turn multimodal instruction-response conversations from a language model.
On the Complementarity between Pre-Training and Back-Translation for Neural Machine Translation (2021.findings-emnlp)

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Challenge: Experimental results show that PT and BT are nicely complementary to each other.
Approach: They introduce two probing tasks for PT and BT respectively and investigate their complementarity.
Outcome: The proposed methods establish state-of-the-art on the WMT16 English-Romanian and English-Russian benchmarks.
Investigating Data Variance in Evaluations of Automatic Machine Translation Metrics (2022.findings-acl)

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Challenge: Current evaluation methods focus on one dataset, e.g., Newstest dataset in each year’s WMT Metrics Shared Task.
Approach: They propose to use a single dataset to evaluate the performance of automatic translation metrics.
Outcome: The results show that the rankings of metrics vary when the evaluation is conducted on different datasets.
Segmenting Natural Language Sentences via Lexical Unit Analysis (2021.findings-emnlp)

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Challenge: Recent work on sequence segmentation models suffer from invalid predictions and a lack of consistency.
Approach: They propose a unified span-based model that embeds every span and computes a score for each segmentation candidate.
Outcome: The proposed model achieves state-of-the-art on 6 of the 3 tasks tested.
The World is Not Binary: Learning to Rank with Grayscale Data for Dialogue Response Selection (2020.emnlp-main)

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Challenge: Existing approaches to learning-to-rank response selection are suboptimal due to ignorance of diversity of response quality.
Approach: They propose to use off-the-shelf response retrieval models as automatic grayscale data generators to train response selection models.
Outcome: The proposed approach can be automated without human effort on grayscale data.
Skeleton-to-Response: Dialogue Generation Guided by Retrieval Memory (N19-1)

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Challenge: Existing generative dialogue models generate responses from input queries . however, the results are limited and the models are unsatisfactory .
Approach: They propose a framework which exploits retrieval results via a skeleton-to-response paradigm . they extract a query skelet and use it to generate a new skele and response .
Outcome: The proposed approach significantly improves the informativeness of the generated responses.
Key Fact as Pivot: A Two-Stage Model for Low Resource Table-to-Text Generation (P19-1)

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Challenge: Existing methods for table-to-text generation use encoder-decoder framework, but lack of large parallel data is a problem for many domains.
Approach: They propose a model to separate table-to-text generation into two stages: key fact prediction and surface realization.
Outcome: The proposed model achieves 27.34 BLEU score with only 1,000 parallel data, while the baseline model only achieves 9.71 BLUE score.
Unsupervised Keyphrase Extraction by Learning Neural Keyphrase Set Function (2023.findings-acl)

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Challenge: Unsupervised keyphrase extraction is a task of extracting a keyphrase set that provides readers with highlevel information about the key ideas or important topics described in the document.
Approach: They propose an unsupervised keyphrase extraction task that is a document-set matching problem instead of modeling the relevance between an individual phrase and the document.
Outcome: The proposed model outperforms the state-of-the-art unsupervised keyphrase extraction baselines by a large margin.
Making Better Use of Training Corpus: Retrieval-based Aspect Sentiment Triplet Extraction via Label Interpolation (2023.findings-acl)

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Challenge: Existing methods to extract sentimental triplets are infeasible and counterproductive . aspect Sentiment Triplets Extraction (ASTE) task is an emerging sub-task of Aspect-based Sentimence Analysis .
Approach: They propose a retrieval-based approach to the Aspect Sentiment Triplet Extraction task . they retrieve semantic similar triplets from the training corpus and interpolate their label information .
Outcome: The proposed approach establishes a new state-of-the-art on the Aspect Sentiment Triplet Extraction task.
Understanding and Improving Hidden Representations for Neural Machine Translation (N19-1)

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Challenge: Existing studies have explored some methods for understanding hidden representations, but they have not sought to improve the translation quality rationally according to their understanding.
Approach: They propose to construct a sequence of nested relative tasks and measure the feature generalization ability of the learned hidden representation over these tasks.
Outcome: The proposed methods achieve consistent improvements (up to +1.3 BLEU) on two widely-used datasets.
BlonDe: An Automatic Evaluation Metric for Document-level Machine Translation (2022.naacl-main)

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Challenge: Standard evaluation metrics, e.g., BLEU, TER and METEOR, focus on the quality of translations at the sentence level and do not consider discourse-level features.
Approach: They propose to use a metric to take discourse coherence into consideration by categorizing discourse-related spans and calculating the similarity-based F1 measure of categorized spans.
Outcome: The proposed metric possesses better selectivity and interpretability at the document-level, and is more sensitive to document- level nuances.
Retrieval-Augmented Few-shot Text Classification (2023.findings-emnlp)

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Challenge: Existing methods for retrieval-augmented text classification are successful in the few-shot scenario with limited retrieval space.
Approach: They propose to use EM-L and R-L to provide task-specific guidance to retrieval metric . they also propose to incorporate retrieved memory alongside parameters for better generalization .
Outcome: The proposed methods perform better on the few-shot scenario with limited retrieval space.
On the Inference Calibration of Neural Machine Translation (2020.acl-main)

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Challenge: Existing studies show that NMT models trained with label smoothing are well-calibrated on ground-truth training data, but miscalibration remains a challenge during inference due to the discrepancy between training and inference.
Approach: They propose a graduated label smoothing method that can improve inference calibration and translation performance.
Outcome: The proposed method improves both inference calibration and translation performance.
Enhancing the Open-Domain Dialogue Evaluation in Latent Space (2021.findings-acl)

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Challenge: Existing methods to evaluate opendomain dialogues are limited due to the one-to-many nature of dialogues.
Approach: They propose a self-supervised setting to obtain a smooth latent space that captures discourse-level context information and implicitly models more references in latent spaces.
Outcome: The proposed method outperforms baseline methods on two real-world dialogue datasets.
DAST: Difficulty-Adaptive Slow-Thinking for Large Reasoning Models (2025.emnlp-industry)

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Challenge: Recent advances in slow-thinking reasoning models have shown exceptional performance in complex reasoning tasks.
Approach: They propose a framework that enables models to automatically adjust Chain-of-Thought (CoT) length based on problem difficulty.
Outcome: The proposed framework penalizes inefficiency on simple problems while incentivizing deep reasoning for complex ones.
Rigid Formats Controlled Text Generation (2020.acl-main)

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Challenge: Neural text generation is a challenging task that requires rigid formats to be controlled . a framework called SongNet is designed to tackle this problem .
Approach: They propose a framework to tackle a task called rigid formats controlled text generation . they propose rhyming schemes and a transformer-based auto-regressive language model to improve the modeling performance .
Outcome: The proposed framework improves the performance on format, rhyme, and sentence integrity.
On the Language Coverage Bias for Neural Machine Translation (2021.findings-acl)

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Challenge: Language coverage bias is important for neural machine translation because of the target-original training data.
Approach: They propose two approaches to alleviate the language coverage bias problem by explicitly distinguishing between the source-and target-original training data.
Outcome: The proposed methods improve translation tasks on both back-and forward-translation and their tagged variants.
Rethinking Word-Level Auto-Completion in Computer-Aided Translation (2023.emnlp-main)

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Challenge: Existing models for word-level auto-completion (WLAC) do not meet the criterion of good auto-completes.
Approach: They propose a measurable criterion to address the question: what kind of words are good auto-completions? they propose an approach to enhance WLAC performance by promoting adherence to the cri-terion.
Outcome: The proposed approach outperforms the top-performing system submitted to the WLAC shared tasks in WMT2022 while using significantly smaller model sizes.
On the Evaluation Metrics for Paraphrase Generation (2022.emnlp-main)

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Challenge: Existing evaluation metrics for paraphrase generation are not designed for the task, but adopted from other evaluation tasks.
Approach: They propose a new evaluation metric for paraphrase generation that uses reference-based and reference-free metrics.
Outcome: The proposed evaluation metric outperforms existing metrics and is more reliable than reference-based metrics.
Selection-p: Self-Supervised Task-Agnostic Prompt Compression for Faithfulness and Transferability (2024.findings-emnlp)

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Challenge: Large Language Models (LLMs) have demonstrated impressive capabilities when leveraging in-context learning.
Approach: They propose a method that discretizes uninformative tokens using a self-supervised pre-training technique.
Outcome: The proposed method achieves state-of-the-art performance across classification tasks while requiring only 0.8% decrease in performance.
A Discrete CVAE for Response Generation on Short-Text Conversation (D19-1)

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Challenge: Neural conversation models are easy to generate bland and generic responses . however, their improvement of generating high-quality responses is still unsatisfactory .
Approach: They propose to use a discrete latent variable with an explicit semantic meaning to improve the conditional variational autoencoder on short-text conversation.
Outcome: The proposed model outperforms various kinds of generation models under automatic and human evaluations and generates more diverse and informative responses.
SORTIE: Dependency-Aware Symbolic Reasoning for Logical Data-to-text Generation (2023.findings-acl)

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Challenge: Existing studies on logical data-to-text generation rely on neural language models to generate the final table description, but they have difficulty working out key entities in the description.
Approach: They propose a symbolic reasoning framework that reasons out each entity in the table description with a table-compatible programming language.
Outcome: The proposed framework outperforms existing methods on three datasets and three backbones with an absolute improvement of 5.7%11.5% on SP-Acc.
Fine-Grained Sentence Functions for Short-Text Conversation (P19-1)

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Challenge: Existing research has analyzed various factors indicating the conversational purpose such as emotions, topics, word orders, syntactic patterns and other aspects.
Approach: They propose to annotate a short-text conversation dataset with annotated sentences and train conversation models conditioned on the sentence functions.
Outcome: The proposed model can predict the quality of the returned responses.
Disperse-Then-Merge: Pushing the Limits of Instruction Tuning via Alignment Tax Reduction (2024.findings-acl)

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Challenge: Pre-trained language models may not follow human instructions and produce toxic, hallucinated, or biased content.
Approach: They propose a disperse-then-merge framework that dispersers instruction-following data into portions and trains multiple sub-models using different data portions.
Outcome: The proposed framework outperforms data curation and training regularization on standard knowledge and reasoning benchmarks.
Phrase-level Self-Attention Networks for Universal Sentence Encoding (D18-1)

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Challenge: Phrase-level self-attention networks (PSAN) can capture context dependencies at the phrase level instead of the sentence level.
Approach: They propose to perform self-attention across words inside a phrase to capture context dependencies at the phrase level and use the gated memory updating mechanism to refine each word’s representation hierarchically with longer-term context dependency captured in a larger phrase.
Outcome: The proposed model can achieve state-of-the-art performance across a plethora of NLP tasks including binary and multi-class classification, natural language inference and sentence similarity.
Rethinking Translation Memory Augmented Neural Machine Translation (2023.findings-acl)

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Challenge: Existing approaches to enhance neural machine translation (NMT) by using a TM have been reported to be effective.
Approach: They propose a translation memory augmented neural machine translation model that is good at fitting data but more sensitive to fluctuations in training data.
Outcome: The proposed model achieves consistent gains over conventional and existing models under two variance-preferable scenarios as well as the high resource scenario.
On Synthetic Data for Back Translation (2022.naacl-main)

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Challenge: Existing studies on back translation (BT) focus on beam search or random sampling . a new method to generate synthetic data with a backward model is proposed to improve BT performance.
Approach: They propose a method to generate synthetic data to trade off quality and importance factors . back translation (BT) is one of the most significant technologies in NMT research fields .
Outcome: The proposed method outperforms the baseline methods on WMT14 DE-EN, EN-DE, and RU-EN benchmark tasks.
Fine-grained Entity Typing without Knowledge Base (2021.emnlp-main)

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Challenge: Existing work on fine-grained entity typing (FET) relies on knowledge bases as distant supervision, but lack of or incompleteness of KB can hinder training.
Approach: They propose a two-step framework that trains FET models without accessing any knowledge base.
Outcome: The proposed framework achieves competitive performance with respect to the models trained on the original KB-supervised datasets.
Target Foresight Based Attention for Neural Machine Translation (N18-1)

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Challenge: Empirical experiments on Chinese-to-English and Japanese-to English datasets show that the proposed attention model delivers significant improvements in terms of alignment error rate and BLEU.
Approach: They propose to explicitly access the target foresight word in the attention model to improve alignment and translation accuracy.
Outcome: Empirical results show that the proposed model improves alignment error rate and BLEU on Chinese-to-English and Japanese-toEnglish datasets.
Fuzzy Reasoning Chain (FRC): An Innovative Reasoning Framework from Fuzziness to Clarity (2025.findings-emnlp)

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Challenge: ambiguity, polysemy, or uncertainty remain significant challenges in natural language processing.
Approach: They introduce a framework that integrates LLM semantic priors with continuous fuzzy membership degrees to create an explicit interaction between probability-based reasoning and fuzzy membership reasoning.
Outcome: The proposed framework integrates semantic priors with continuous fuzzy membership degrees . it allows ambiguous inputs to be gradually transformed into clear and interpretable decisions .

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