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Piji Li

35 accepted papers

2026

Instruction Decomposition and Action Alignment for Vision-Language Navigation

ICML 2026poster

Vision-and-Language Navigation (VLN) empowered by Multimodal Large Language Models (MLLMs) is promise, yet remains challenged by long-horizon tasks with complex user instructions. Existing approaches that continuously condition on full instructions incur high latency due to abundant visual tokens an…

Cited by 0SourceScholar
2026

Investigating Advanced Reasoning of Large Language Models via Black-Box Interaction

ICML 2026poster

Existing tasks fall short in evaluating reasoning ability of Large Language Models (LLMs) in an interactive, unknown environment. This deficiency leads to the isolated assessment of deductive, inductive, and abductive reasoning, neglecting the integrated reasoning process that is indispensable for h…

Cited by 0SourceScholar
2026

R4: Nested Reasoning-Retrieval for Reward Modeling in Role-Playing Agents

ICLR 2026poster

Role-playing dialogue presents unique challenges for large language models (LLMs): beyond producing coherent text, models must sustain character persona, integrate contextual knowledge, and convey emotional nuance. Despite strong reasoning abilities, current LLMs often generate dialogue that is lite…

Cited by 0SourceScholar
2026

Sampling-Free Uncertainty Quantification via Hidden State Dynamics in Language Models

AAAI 2026technical

Large language models (LLMs) demonstrate remarkable capabilities in various complex language tasks, yet they face significant reliability challenges, including factual inaccuracies and generated biases. Uncertainty quantification (UQ) plays a pivotal role in assessing model trustworthiness, particul

Cited by 0SourcePDFScholar
2025

Brain-Inspired fMRI-to-Text Decoding via Incremental and Wrap-Up Language Modeling

NeurIPS 2025spotlight

Decoding natural language text from non-invasive brain signals, such as functional magnetic resonance imaging (fMRI), remains a central challenge in brain-computer interface research. While recent advances in large language models (LLMs) have enabled open-vocabulary fMRI-to-text decoding, existing f…

Cited by 0SourceScholar
2025

Generating Diverse Training Samples for Relation Extraction with Large Language Models

ACL 2025long

Using Large Language Models (LLMs) to generate training data can potentially be a preferable way to improve zero or few-shot NLP tasks. However, many problems remain to be investigated for this direction. For the task of Relation Extraction (RE), we find that samples generated by directly prompting…

Cited by 0SourcePDFScholar
2025

Improve Language Model and Brain Alignment via Associative Memory

ACL 2025finding

Associative memory engages in the integration of relevant information for comprehension in the human cognition system. In this work, we seek to improve alignment between language models and human brain while processing speech information by integrating associative memory. After verifying the alignme…

2025

M-BRe: Discovering Training Samples for Relation Extraction from Unlabeled Texts with Large Language Models

EMNLP 2025

For Relation Extraction (RE), the manual annotation of training data may be prohibitively expensive, since the sentences that contain the target relations in texts can be very scarce and difficult to find. It is therefore beneficial to develop an efficient method that can automatically extract train

Cited by 0SourcePDFScholar
2025

MDD-5k: A New Diagnostic Conversation Dataset for Mental Disorders Synthesized via Neuro-Symbolic LLM Agents

AAAI 2025technical

The clinical diagnosis of most mental disorders primarily relies on the conversations between psychiatrist and patient. The creation of such diagnostic conversation datasets is promising to boost the AI mental healthcare community. However, directly collecting the conversations in real diagnosis sce…

2025

Rethinking Cross-Subject Data Splitting for Brain-to-Text Decoding

EMNLP 2025

Recent major milestones have successfully reconstructed natural language from non-invasive brain signals (e.g. functional Magnetic Resonance Imaging (fMRI) and Electroencephalogram (EEG)) across subjects. However, we find current dataset splitting strategies for cross-subject brain-to-text decoding

Cited by 0SourcePDFScholar
2024

An Empirical Investigation of Domain Adaptation Ability for Chinese Spelling Check Models

ICASSP 2024accepted

Chinese Spelling Check (CSC) is a meaningful task in the area of Natural Language Processing (NLP) which aims at detecting spelling errors in Chinese texts and then correcting these errors. However, CSC models are based on pretrained language models, which are trained on a general corpus. Consequent…

Cited by 0SourceScholar
2024

CACL: Community-Aware Heterogeneous Graph Contrastive Learning for Social Media Bot Detection

ACL 2024findings

Social media bot detection is increasingly crucial with the rise of social media platforms. Existing methods predominantly construct social networks as graph and utilize graph neural networks (GNNs) for bot detection. However, most of these methods focus on how to improve the performance of GNNs whi…

2024

HELPD: Mitigating Hallucination of LVLMs by Hierarchical Feedback Learning with Vision-enhanced Penalty Decoding

EMNLP 2024main

Large Vision-Language Models (LVLMs) have shown remarkable performance on many visual-language tasks. However, these models still suffer from multimodal hallucination, which means the generation of objects or content that violates the images. Many existing work detects hallucination by directly judg…

2024

LEMoE: Advanced Mixture of Experts Adaptor for Lifelong Model Editing of Large Language Models

EMNLP 2024main

Large language models (LLMs) require continual knowledge updates to stay abreast of the ever-changing world facts, prompting the formulation of lifelong model editing task. While recent years have witnessed the development of various techniques for single and batch editing, these methods either fail…

2024

Semantic are Beacons: A Semantic Perspective for Unveiling Parameter-Efficient Fine-Tuning in Knowledge Learning

ACL 2024findings

Parameter-Efficient Fine-Tuning (PEFT) methods enable efficient adaptation of Large Language Models (LLMs) to various downstream applications. However, the effectiveness of the PEFT diminishes notably when downstream tasks require accurate learning of specific knowledge. In this paper, we adopt a se…

Cited by 5SourcePDFScholar
2023

Feature-Level Debiased Natural Language Understanding

AAAI 2023technical

Natural language understanding (NLU) models often rely on dataset biases rather than intended task-relevant features to achieve high performance on specific datasets. As a result, these models perform poorly on datasets outside the training distribution. Some recent studies address this issue by red…

2023

InfoDiffusion: Information Entropy Aware Diffusion Process for Non-Autoregressive Text Generation

EMNLP 2023long findings

Diffusion models have garnered considerable interest in the field of text generation. Several studies have explored text diffusion models with different structures and applied them to various tasks, including named entity recognition and summarization. However, there exists a notable disparity betwe…

Cited by 0SourcecodeScholar
2023

Multi-Layer Feature Division Transferable Adversarial Attack

ICASSP 2023accepted

Improving the transferability of adversarial examples for the purpose of attacking unknown black-box models has been intensively studied. In particular, feature-level transfer-based attacks, which destroy the intermediate feature outputs of source models, are proven to generate more transferable adv…

Cited by 0SourceScholar
2023

Multi-Source Multi-Type Knowledge Exploration and Exploitation for Dialogue Generation

EMNLP 2023long main

Open-domain multi-turn dialogue generation encounters the significant challenge of lacking various types of knowledge from diverse sources. Existing models typically focus on identifying specific types of dialogue knowledge and utilize corresponding datasets for training. However, this approach ofte…

Cited by 0SourceScholar
2023

Seri: Sketching-Reasoning-Integrating Progressive Workflow for Empathetic Response Generation

ICASSP 2023accepted

Empathy is a key ability for a human-like dialogue system. Inspired by social psychology, empathy includes both affective and cognitive aspects. Previous works on this topic have merely focused on recognizing emotions or modeling cognition with commonsense knowledge. Nevertheless, the generated resu…

Cited by 0SourceScholar
2022

Event Transition Planning for Open-ended Text Generation

ACL 2022findings

Open-ended text generation tasks, such as dialogue generation and story completion, require models to generate a coherent continuation given limited preceding context. The open-ended nature of these tasks brings new challenges to the neural auto-regressive text generators nowadays. Despite these neu…

2022

Knowledge Bridging for Empathetic Dialogue Generation

AAAI 2022technical

Lack of external knowledge makes empathetic dialogue systems difficult to perceive implicit emotions and learn emotional interactions from limited dialogue history. To address the above problems, we propose to leverage external knowledge, including commonsense knowledge and emotional lexical knowled…

2022

Understanding Social Media Cross-Modality Discourse in Linguistic Space

EMNLP 2022finding

The multimedia communications with texts and images are popular on social media. However, limited studies concern how images are structured with texts to form coherent meanings in human cognition. To fill in the gap, we present a novel concept of cross-modality discourse, reflecting how human reader…

2022

“Is Whole Word Masking Always Better for Chinese BERT?”: Probing on Chinese Grammatical Error Correction

ACL 2022findings

Whole word masking (WWM), which masks all subwords corresponding to a word at once, makes a better English BERT model. For the Chinese language, however, there is no subword because each token is an atomic character. The meaning of a word in Chinese is different in that a word is a compositional uni…

Cited by 23SourcePDFScholar
2021

A Training-free and Reference-free Summarization Evaluation Metric via Centrality-weighted Relevance and Self-referenced Redundancy

ACL 2021long

In recent years, reference-based and supervised summarization evaluation metrics have been widely explored. However, collecting human-annotated references and ratings are costly and time-consuming. To avoid these limitations, we propose a training-free and reference-free summarization evaluation met…

2021

CLINE: Contrastive Learning with Semantic Negative Examples for Natural Language Understanding

ACL 2021long

Despite pre-trained language models have proven useful for learning high-quality semantic representations, these models are still vulnerable to simple perturbations. Recent works aimed to improve the robustness of pre-trained models mainly focus on adversarial training from perturbed examples with s…

2021

Contrastive Representation Learning for Exemplar-Guided Paraphrase Generation

EMNLP 2021finding

Exemplar-Guided Paraphrase Generation (EGPG) aims to generate a target sentence which conforms to the style of the given exemplar while encapsulating the content information of the source sentence. In this paper, we propose a new method with the goal of learning a better representation of the style…

2021

Generating Diversified Comments via Reader-Aware Topic Modeling and Saliency Detection

AAAI 2021technical

Automatic comment generation is a special and challenging task to verify the model ability on news content comprehension and language generation. Comments not only convey salient and interesting information in news articles, but also imply various and different reader characteristics which we treat…

2021

Tail-to-Tail Non-Autoregressive Sequence Prediction for Chinese Grammatical Error Correction

ACL 2021long

We investigate the problem of Chinese Grammatical Error Correction (CGEC) and present a new framework named Tail-to-Tail (TtT) non-autoregressive sequence prediction to address the deep issues hidden in CGEC. Considering that most tokens are correct and can be conveyed directly from source to target…

2020

Keep it Consistent: Topic-Aware Storytelling from an Image Stream via Iterative Multi-agent Communication

COLING 2020main

Visual storytelling aims to generate a narrative paragraph from a sequence of images automatically. Existing approaches construct text description independently for each image and roughly concatenate them as a story, which leads to the problem of generating semantically incoherent content. In this p…

Cited by 15SourcePDFScholar