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Chenxin An

13 accepted papers

2026

Attention as a Compass: Efficient Exploration for Process-Supervised RL in Reasoning Models

ICLR 2026poster

Reinforcement Learning (RL) has shown remarkable success in enhancing the reasoning capabilities of Large Language Models (LLMs). Process-Supervised RL (PSRL) has emerged as a more effective paradigm compared to outcome-based RL. However, existing PSRL approaches suffer from limited exploration effi…

Cited by 0SourcecodeScholar
2025

Long Chain-of-Thought Fine-tuning via Understanding-to-Reasoning Transition

EMNLP 2025

Reasoning models have demonstrated remarkable performance on complex tasks by generating long reasoning traces prior to producing final answers. However, previous research on long-context scaling in language models has generally focused on managing lengthy input prompts instead of producing long out

2025

Scaling Diffusion Language Models via Adaptation from Autoregressive Models

ICLR 2025poster

Diffusion Language Models (DLMs) have emerged as a promising new paradigm for text generative modeling, potentially addressing limitations of autoregressive (AR) models. However, current DLMs have been studied at a smaller scale compared to their AR counterparts and lack fair comparison on language…

2025

Temporal Reasoning Transfer from Text to Video

ICLR 2025poster

Video Large Language Models (Video LLMs) have shown promising capabilities in video comprehension, yet they struggle with tracking temporal changes and reasoning about temporal relationships. While previous research attributed this limitation to the ineffective temporal encoding of visual inputs, ou…

Cited by 2SourcePDFScholar
2025

VL-RewardBench: A Challenging Benchmark for Vision-Language Generative Reward Models

CVPR 2025highlight

Vision-language generative reward models (VL-GenRMs) play a crucial role in aligning and evaluating multimodal AI systems, yet their own evaluation remains under-explored. Current assessment methods primarily rely on AI-annotated preference labels from traditional VL tasks, which can introduce biase…

2025

Why Does the Effective Context Length of LLMs Fall Short?

ICLR 2025poster

Advancements in distributed training and efficient attention mechanisms have significantly expanded the context window sizes of large language models (LLMs). However, recent work reveals that the effective context lengths of open-source LLMs often fall short, typically not exceeding half of their tr…

Cited by 60SourcePDFScholar
2024

L-Eval: Instituting Standardized Evaluation for Long Context Language Models

ACL 2024long

Recently, there has been growing interest in long-context scaling of large language models (LLMs). To facilitate research in this field, we propose L-Eval to institute a more standardized evaluation for Long-Context Language Models (LCLMs) addressing two key aspects: dataset construction and evaluat…

2024

Seeking Neural Nuggets: Knowledge Transfer in Large Language Models from a Parametric Perspective

ICLR 2024poster

Large Language Models (LLMs) inherently encode a wealth of knowledge within their parameters through pre-training on extensive corpora. While prior research has delved into operations on these parameters to manipulate the underlying implicit knowledge — encompassing detection, editing, and merging —…

2024

Training-Free Long-Context Scaling of Large Language Models

ICML 2024poster

The ability of Large Language Models (LLMs) to process and generate coherent text is markedly weakened when the number of input tokens exceeds their pretraining length. Given the expensive overhead of finetuning large-scale models with longer sequences, we propose a training-free approach named Dual…

2022

CoLo: A Contrastive Learning Based Re-ranking Framework for One-Stage Summarization

COLING 2022main

Traditional training paradigms for extractive and abstractive summarization systems always only use token-level or sentence-level training objectives. However, the output summary is always evaluated from summary-level which leads to the inconsistency in training and evaluation. In this paper, we pro…

2022

CoNT: Contrastive Neural Text Generation

NeurIPS 2022accept

Recently, contrastive learning attracts increasing interests in neural text generation as a new solution to alleviate the exposure bias problem. It introduces a sequence-level training signal which is crucial to generation tasks that always rely on auto-regressive decoding. However, previous method…

Cited by 52SourcePDFScholar
2021

Enhancing Scientific Papers Summarization with Citation Graph

AAAI 2021technical

Previous work for text summarization in scientific domain mainly focused on the content of the input document, but seldom considering its citation network. However, scientific papers are full of uncommon domain-specific terms, making it almost impossible for the model to understand its true meaning…