Papers by Yasheng Wang

42 papers
NL-Debugging: Exploiting Natural Language as an Intermediate Representation for Code Debugging (2025.emnlp-main)

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Challenge: Early debugging efforts focused on code-level analysis, which often fails when addressing complex programming errors.
Approach: They propose a framework that employs natural language as an intermediate representation to improve code debugging by debuggating at a natural language level.
Outcome: The proposed framework outperforms traditional debugging methods and enables a broader modification space through direct refinement guided by execution feedback.
Improving Factual Consistency for Knowledge-Grounded Dialogue Systems via Knowledge Enhancement and Alignment (2023.findings-emnlp)

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Challenge: Experimental results show that pretrained language models generate inconsistent factual knowledge in many conversational tasks.
Approach: They propose a method which explicitly introduces extended feedforward networks (FFNs) in Transformers to enhance factual knowledge expressions given the specific patterns of knowledge-grounded dialogue inputs.
Outcome: The proposed methods improve the factual expression capability of feedforward networks (FFNs) in knowledge-grounded dialogue systems by knowledge enhancement and alignment respectively.
Safe: Enhancing Mathematical Reasoning in Large Language Models via Retrospective Step-aware Formal Verification (2025.acl-long)

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Challenge: Chain-of-Thought prompting is a de facto method to elicit reasoning capabilities from large language models (LLMs).
Approach: They propose a step-aware formal verification framework Safe to address hallucinations in CoT prompting . they propose 'formal step' as a benchmark for step correctness theorem proving with 30,809 formal statements.
Outcome: The proposed framework shows significant performance improvement while offering interpretable and verifiable evidence.
LMTurk: Few-Shot Learners as Crowdsourcing Workers in a Language-Model-as-a-Service Framework (2022.findings-naacl)

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Challenge: Recent work shows that large-scale pretrained language models (PLMs) are effective few-shot learners.
Approach: They propose a method that treats few-shotlearners as crowdsourcing workers . they propose to use these workers to train models that solve a task well .
Outcome: The proposed approach treats few-shotlearners as crowdsourcing workers . the resulting annotations can be utilized to train models that solve the task well .
CODE-MVP: Learning to Represent Source Code from Multiple Views with Contrastive Pre-Training (2022.findings-naacl)

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Challenge: Recent studies have focused on code representation learning, which aims to represent the semantics of source code into distributed vectors.
Approach: They propose to integrate different views with the natural-language description of source code into a unified framework with Multi-View contrastive Pre-training.
Outcome: The proposed model outperforms state-of-the-art models on three downstream tasks over five datasets.
DebateCoder: Towards Collective Intelligence of LLMs via Test Case Driven LLM Debate for Code Generation (2025.acl-long)

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Challenge: Existing debate-based approaches to code generation are limited due to several reasons: 1) Reliance on different instances of the same LLM for debate, 2) under-utilization of test cases, and 3) reliance on third-party moderators for result consolidation and decision-making.
Approach: They propose to use test cases to analyze code and identify bugs while opposing models generate test cases for each other to challenge each other's code during the debate process.
Outcome: The proposed model collects intelligence of LLMs via test case-driven debate for code generation.
Humanity’s Last Code Exam: Can Advanced LLMs Conquer Human’s Hardest Code Competition? (2025.findings-emnlp)

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Challenge: o4-mini(high) and Gemini-2.5 Pro achieve pass@1 rates of only 15.9% and 11.4%, respectively.
Approach: They propose a harmonized online–offline sandbox that guarantees fully reproducible evaluation.
Outcome: The proposed test reflects the advanced reasoning and code generation ability of large language models.
Large Language Models as Source Planner for Personalized Knowledge-grounded Dialogues (2023.findings-emnlp)

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Challenge: Existing knowledge-grounded dialogue systems focus on a single knowledge source or ignore the dependency between multiple knowledge sources.
Approach: They propose a framework that integrates multiple knowledge sources and dependencies between them.
Outcome: The proposed framework can produce persona-consistent and knowledge-enhanced responses on a knowledge-grounded dialogue dataset.
Sub-Character Tokenization for Chinese Pretrained Language Models (2023.tacl-1)

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Challenge: Existing tokenization methods for Chinese PLMs treat each character as an indivisible token, but ignore the unique feature of the writing system where additional linguistic information exists below the character level.
Approach: They propose to encode Chinese characters into short sequences and construct Chinese vocabulary based on the encoded text.
Outcome: The proposed tokenizers can tokenize inputs into much shorter sequences, improving computational efficiency.
Leveraging Only the Category Name for Aspect Detection through Prompt-based Constrained Clustering (2022.findings-emnlp)

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Challenge: Aspect category detection (ACD) aims to automatically identify user-concerned aspects from online reviews.
Approach: They propose a method that relies on the category name of each aspect and a pretrained language model to generate constraints for clustering.
Outcome: The proposed framework performs better than existing weakly supervised methods on nine benchmark datasets.
Constructing Highly Inductive Contexts for Dialogue Safety through Controllable Reverse Generation (2022.findings-emnlp)

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Challenge: Existing methods to detect toxic generation of pretrained language models rely on templates, data extraction, crowdsourcing workers or automatic generation.
Approach: They propose a method to construct adversarial contexts conditioned on a given response . they augment existing dataset BAD+ and construct a new dataset B AD+ .
Outcome: The proposed method can detect toxic or biased content in large pretrained language models.
DecompEval: Evaluating Generated Texts as Unsupervised Decomposed Question Answering (2023.acl-long)

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Challenge: Existing evaluation metrics for natural language generation (NLG) tasks face the challenges on generalization ability and interpretability.
Approach: They propose a metric that evaluates natural language generation tasks as an instruction-style question answering task and utilizes instruction-tuned pre-trained language models without training on evaluation datasets.
Outcome: The proposed metric achieves state-of-the-art performance in untrained metrics for evaluating text summarization and dialogue generation, which exhibits strong dimension-level / task-level generalization ability and interpretability.
One Cannot Stand for Everyone! Leveraging Multiple User Simulators to train Task-oriented Dialogue Systems (2023.acl-long)

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Challenge: Recent studies have found that Task-oriented Dialogue systems can be more suitable for human users.
Approach: They propose a framework to optimize ToD systems by leveraging Multiple User SimulaTors.
Outcome: The proposed framework improves performance on multiWOZ with human evaluations and automatic evaluations.
CoIR: A Comprehensive Benchmark for Code Information Retrieval Models (2025.acl-long)

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Challenge: Existing methods and benchmarks for information retrieval are inadequately representing the diversity of code in various domains and tasks.
Approach: They propose a benchmark specifically designed to assess code retrieval capabilities.
Outcome: The proposed benchmark aims to invigorate research in the code retrieval domain . it shares the same data schema as other popular benchmarks like MTEB and BEIR .
Boost, Disentangle, and Customize: A Robust System2-to-System1 Pipeline for Code Generation (2025.findings-acl)

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Challenge: Existing systems 2 methods for code generation are difficult to implement due to the complex hidden reasoning process and heterogeneous data distribution.
Approach: They propose a framework that Boosts reasoning exploration via multi-agent collaboration and Disentangles heterogeneous data into specialized experts.
Outcome: The proposed framework outperforms state-of-the-art methods on APPS and CodeContest benchmarks and achieves 73.8% accuracy on hard problems.
Stepwise Reasoning Checkpoint Analysis: A Test Time Scaling Method to Enhance LLMs’ Reasoning (2025.emnlp-main)

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Challenge: Existing methods that use Chain-of-Thought suffer from path homogenization and inefficient use of intermediate results.
Approach: They propose a framework that introduces checkpoints between reasoning steps to reduce path homogenization and create fault-tolerant mechanisms.
Outcome: The proposed framework reduces path homogenization and creates fault-tolerant mechanism by utilizing high-quality intermediate results.
UniRetriever: Multi-task Candidates Selection for Various Context-Adaptive Conversational Retrieval (2024.lrec-main)

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Challenge: Existing methods for retrieving information from a large corpus of data are sub-optimal and low efficiency.
Approach: They propose a multi-task framework that functions as a universal retriever for three dominant retrieval tasks during the conversation.
Outcome: The proposed framework can perform persona selection, knowledge selection, and response selection tasks simultaneously.
Momentum Contrastive Pre-training for Question Answering (2022.emnlp-main)

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Challenge: Existing methods for extractive Question Answering generate cloze-like queries different from natural questions in syntax structure, which could overfit pre-trained models to simple keyword matching.
Approach: They propose a method to align the answer probability between cloze-like and natural query-passage sample pairs.
Outcome: The proposed method improves on three benchmarking QA datasets on supervised and zero-shot scenarios.
Crowd Comparative Reasoning: Unlocking Comprehensive Evaluations for LLM-as-a-Judge (2025.acl-long)

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Challenge: Existing methods rely on majority voting or criteria expansion to capture detailed and detailed details, often leading to incomplete outcomes.
Approach: They propose a method which introduces additional crowd responses to compare with the candidate responses, thereby exposing deeper and more comprehensive details within the candidate answers.
Outcome: Experiments show that the proposed method improves evaluation reliability and achieves an average gain of 6.7% across five benchmarks.
RethinkMCTS: Refining Erroneous Thoughts in Monte Carlo Tree Search for Code Generation (2025.emnlp-main)

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Challenge: Existing tree search methods neglect the underlying reasoning process, resulting in poor search quality.
Approach: They propose a framework that systematically explores and refines the reasoning process for code generation by using a tree search engine and a reflection mechanism.
Outcome: The proposed framework outperforms existing methods in the code generation domain.
Pan More Gold from the Sand: Refining Open-domain Dialogue Training with Noisy Self-Retrieval Generation (2022.coling-1)

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Challenge: Existing methods for generating open-domain dialogue systems underutilize training data.
Approach: They propose a retrieval-generation training framework that takes advantage of heterogeneous training data by considering them as "evidence" they use BERTScore retrieval framework which gives better qualities of the training data, they show .
Outcome: The proposed method performs well on zero-shot experiments and is more robust to real-world data.
Revisiting Pre-trained Language Models and their Evaluation for Arabic Natural Language Processing (2022.emnlp-main)

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Challenge: Existing pre-trained language models are not well-explored and are not reproducible in the literature.
Approach: They propose to improve existing Arabic language pre-trained language models using a more methodical approach.
Outcome: The proposed models outperform existing models on ALUE, a leaderboard-powered benchmark for Arabic NLU and NLG tasks.
HyperPELT: Unified Parameter-Efficient Language Model Tuning for Both Language and Vision-and-Language Tasks (2023.findings-acl)

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Challenge: Pretraining and fine-tuning are the dominant paradigms in natural language processing.
Approach: They propose a parameter-efficient multitask learning framework that takes trainable hyper-embeddings and visual modality as input and outputs weights for different modules in a pretrained language model.
Outcome: The proposed framework adds fewer trainable parameters in multi-task learning while achieving superior performances and transfer ability compared to state-of-the-art methods.
CodePRM: Execution Feedback-enhanced Process Reward Model for Code Generation (2025.findings-acl)

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Challenge: Recent advances in code generation focus on optimizing the thought process, but lack effective process supervision, making it difficult to optimize the thoughts.
Approach: They propose a method that leverages the code execution feedback to build a code PRM by collecting a large dataset of thought traces and then training it to take both the reasoning process and code execution as input.
Outcome: The proposed approach outperforms baselines and strong LLMs in the inference stage.
Improving Language Model Reasoning with Self-motivated Learning (2024.lrec-main)

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Challenge: Large-scale high-quality training data is important for improving the performance of models.
Approach: They propose a framework that motivates the model to automatically generate rationales on existing datasets and improves the performance of reasoning through reinforcement learning.
Outcome: The proposed model outperforms InstructGPT on multiple reasoning datasets and outperformed InstructGPT on other datasets.
Hidden Killer: Invisible Textual Backdoor Attacks with Syntactic Trigger (2021.acl-long)

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Challenge: Existing methods for textual backdoor attacks insert additional contents into normal samples as triggers, causing detection and blocking of backdoors.
Approach: They propose to use syntactic structure as trigger in textual backdoor attacks . they propose to achieve similar attack performance but have higher invisibility .
Outcome: The proposed method achieves almost 100% success rate but has higher invisibility and stronger resistance to defenses than the insertion-based methods.
MoralDial: A Framework to Train and Evaluate Moral Dialogue Systems via Moral Discussions (2023.acl-long)

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Challenge: A moral dialogue system aligned with users’ values could enhance conversation engagement and user connections.
Approach: They propose a framework to train and evaluate moral dialogue systems based on communication mechanisms of morality and a method to construct moral discussions between simulated users and the dialogue system.
Outcome: The proposed framework can train and evaluate moral dialogue systems based on simulated users and their values .
ProxyQA: An Alternative Framework for Evaluating Long-Form Text Generation with Large Language Models (2024.acl-long)

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Challenge: Existing evaluation methods for large language models are labor-intensive and lack efficiency.
Approach: They propose a framework dedicated to assessing long-text generation that includes in-depth human-curated meta-questions spanning various domains . they use a set of proxy-quests with pre-annotated answers to assess the content's quality by incorporating the generated texts as contextual background.
Outcome: The proposed framework assesses the quality of long-text content by matching it with references through human evaluation or automated metrics.
NILE: Internal Consistency Alignment in Large Language Models (2025.emnlp-main)

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Challenge: Recent advances show that the world knowledge in the Instruction Fine-Tuning (IFT) dataset, which is incompatible with LLMs’ internal knowledge, can greatly hurt the IFT performance.
Approach: They propose a framework to optimize the effectiveness of IFT by carefully aligning the world and internal knowledge of LLMs.
Outcome: The proposed framework can significantly improve performance across multiple LLM ability evaluation datasets.
ToolFlow: Boosting LLM Tool-Calling Through Natural and Coherent Dialogue Synthesis (2025.naacl-long)

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Challenge: Large Language Models (LLMs) can be enhanced by using supervised fine-tuning . however, access to fine-timing data can be limited.
Approach: They propose a Graph-based Sampling strategy and a Planned-generation strategy to enhance the coherence between dialogues by using 8,000 synthetic dialogues.
Outcome: The proposed model achieves tool-calling performance comparable to or surpassing GPT-4 while maintaining strong general capabilities.
Chain-of-Probe: Examining the Necessity and Accuracy of CoT Step-by-Step (2025.findings-naacl)

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Challenge: Current research found the issue of Early Answering in large language models where the models already have an answer before generating the Chain-of-Thought (CoT).
Approach: They propose a method to probe changes in confidence during the model’s reasoning and prioritize answers with correct reasoning among multiple candidates.
Outcome: The proposed method reveals that in a significant number of question-answer cases, CoT appears to be unnecessary and this necessity correlates with the simplicity of the task, defined by the reasoning steps required.
Adaptive Tool Use in Large Language Models with Meta-Cognition Trigger (2025.acl-long)

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Challenge: Existing research expands the tool arrays of large language models (LLMs), but the necessity of using these tools is often overlooked, leading to indiscriminate tool invocation.
Approach: They propose a meta-cognition proxy proxy for LLMs self-assessment of their capabilities, reflecting the model’s awareness of its own limitations.
Outcome: The proposed strategy is fine-tuned-free and costs minimal.
Towards Identifying Social Bias in Dialog Systems: Framework, Dataset, and Benchmark (2022.findings-emnlp)

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Challenge: a number of safety concerns hinder the deployment of open-domain dialog systems, such as offensive languages and toxic behaviors, such social bias is difficult to detect.
Approach: They propose a Dial-Bias Framework for analyzing social bias in conversations . they introduce a Chinese social bias dialog dataset and conduct in-depth ablation studies .
Outcome: The proposed framework is the first annotated Chinese social bias dialog dataset . the proposed framework also provides a fine-grained dialog bias measurement benchmark .
Compilable Neural Code Generation with Compiler Feedback (2022.findings-acl)

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Challenge: Existing deep-learning approaches model code generation as text generation, but few of them account for compilability of the generated programs.
Approach: They propose a three-stage pipeline utilizing compiler feedback for compilable code generation to improve compilability.
Outcome: The proposed pipeline improves compilability of generated programs by combining compiler feedback, language model fine-tuning, and compilable discrimination.
Evaluating Robustness of Generative Search Engine on Adversarial Factoid Questions (2024.findings-acl)

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Challenge: Existing large language models (LLMs)-backed generative search engines may not always be accurate.
Approach: They propose to evaluate the robustness of retrieval-augmented generation in a realistic and high-risk setting where adversaries have only black-box system access.
Outcome: The proposed model exhibits higher susceptibility to factual errors compared to LLMs without retrieval.
A Synthetic Data Generation Framework for Grounded Dialogues (2023.acl-long)

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Challenge: Existing approaches to train grounded dialogues require large amounts of data.
Approach: They propose a synthetic data generation framework for grounded dialogues that takes knowledge data and heuristics to determine a dialogue flow and incrementally turn it into a dialog.
Outcome: The proposed framework significantly boosts model performance in training data and low-resource scenarios.
Planning, Creation, Usage: Benchmarking LLMs for Comprehensive Tool Utilization in Real-World Complex Scenarios (2024.findings-acl)

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Challenge: Existing benchmarks focus on simple synthesized queries that do not reflect real-world complexity, thereby offering limited perspectives in evaluating tool utilization.
Approach: They propose a benchmark to evaluate LLMs’ ability in tool utilization within real-world scenarios.
Outcome: The proposed benchmark improves LLMs’ ability in tool utilization within real-world scenarios and eliminates the restriction of pre-defined toolset.
Retrieval-free Knowledge Injection through Multi-Document Traversal for Dialogue Models (2023.acl-long)

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Challenge: Existing research on retrieval-augmented and retrieval free dialogue models focuses on retrieving knowledge from external sources and rely on finely annotated retrieval training data and knowledge-grounded responses.
Approach: They propose a retrieval-free approach by turning knowledge documents into simulated multi-turn dialogues using a Multi-Document Traversal algorithm.
Outcome: The proposed approach outperforms retrieval-augmented models while being cheaper and faster at domain transfer.
Instruction-Tuning Data Synthesis from Scratch via Web Reconstruction (2025.findings-acl)

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Challenge: Existing methods for generating and curating high-quality instruction-tuning data rely heavily on the quality of seed data or strong assumptions about the structure and content of web documents.
Approach: They propose a fully automated framework for synthesizing high-quality instruction-tuning (IT) data directly from raw web documents with minimal assumptions.
Outcome: The proposed framework outperforms state-of-the-art baselines by 16.65% across four instruction-following benchmarks.
Better Robustness by More Coverage: Adversarial and Mixup Data Augmentation for Robust Finetuning (2021.findings-acl)

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Challenge: Pretrained language models perform poorly under adversarial attacks due to the large search space.
Approach: They propose a method to cover a much larger proportion of the attack search space by adding textual adversarial examples during training.
Outcome: The proposed method covers a much larger proportion of the attack search space.
Dynamic Stochastic Decoding Strategy for Open-Domain Dialogue Generation (2024.findings-acl)

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Challenge: Stochastic sampling strategies are not widely used in open-domain dialogue systems.
Approach: They propose a dynamic decoding strategy which can adjust the decoding space w.r.t. different contexts.
Outcome: The proposed decoding strategy can improve the performance of pre-trained models when coupled with four well-used stochastic decoding algorithms.
AEG: Argumentative Essay Generation via A Dual-Decoder Model with Content Planning (2022.emnlp-main)

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Challenge: Existing studies on argument generation focus on generating individual short arguments, while research on generating long and coherent argumentative essays is under-explored.
Approach: They propose a task to automatically generate argumentative essays using a writing prompt.
Outcome: The proposed model generates persuasive essays with higher diversity and less repetition compared to baselines.

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