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Manabu Okumura

40 accepted papers

2026

ExpVid: A Benchmark for Experiment Video Understanding & Reasoning

ICLR 2026poster

Multimodal Large Language Models (MLLMs) hold promise for accelerating scientific discovery by interpreting complex experimental procedures. However, their true capabilities are poorly understood, as existing benchmarks neglect the fine-grained and long-horizon nature of authentic laboratory work, e…

Cited by 0SourcecodeScholar
2025

AdParaphrase v2.0: Generating Attractive Ad Texts Using a Preference-Annotated Paraphrase Dataset

ACL 2025finding

Identifying factors that make ad text attractive is essential for advertising success. This study proposes AdParaphrase v2.0, a dataset for ad text paraphrasing, containing human preference data, to enable the analysis of the linguistic factors and to support the development of methods for generatin…

2025

AdParaphrase: Paraphrase Dataset for Analyzing Linguistic Features toward Generating Attractive Ad Texts

NAACL 2025findings

Effective linguistic choices that attract potential customers play crucial roles in advertising success. This study aims to explore the linguistic features of ad texts that influence human preferences. Although the creation of attractive ad texts is an active area of research, progress in understand…

2025

CofCA: A STEP-WISE Counterfactual Multi-hop QA benchmark

ICLR 2025poster

While Large Language Models (LLMs) excel in question-answering (QA) tasks, their real reasoning abilities on multiple evidence retrieval and integration on Multi-hop QA tasks remain less explored. Firstly, LLMs sometimes generate answers that rely on internal memory rather than retrieving evidence a…

Cited by 4SourcePDFScholar
2025

Considering Length Diversity in Retrieval-Augmented Summarization

NAACL 2025findings

This study investigates retrieval-augmented summarization by specifically examining the impact of exemplar summary lengths because previous methods have not considered length constraints. We propose a Diverse Length-aware Maximal Marginal Relevance (DL-MMR) algorithm to better control summary length…

2025

DyG-Mamba: Continuous State Space Modeling on Dynamic Graphs

NeurIPS 2025poster

Dynamic graph modeling aims to uncover evolutionary patterns in real-world systems, enabling accurate social recommendation and early detection of cancer cells. Inspired by the success of recent state space models in efficiently capturing long-term dependencies, we propose DyG-Mamba by translating d…

Cited by 0SourcecodeScholar
2025

Length Representations in Large Language Models

EMNLP 2025

Large language models (LLMs) have shown remarkable capabilities across various tasks, that are learned from massive amounts of text-based data. Although LLMs can control output sequence length, particularly in instruction-based settings, the internal mechanisms behind this control have been unexplor

2025

MMQA: Evaluating LLMs with Multi-Table Multi-Hop Complex Questions

ICLR 2025oral

While large language models (LLMs) have made strides in understanding tabular data, current tabular evaluation benchmarks, such as WikiTableQuestions and WikiSQL, are focus on single-table scenarios, which cannot necessarily reflect the complexity of real-world applications. To bridge this gap, we p…

Cited by 2SourcePDFScholar
2025

Unveiling the Power of Source: Source-based Minimum Bayes Risk Decoding for Neural Machine Translation

ACL 2025long

Maximum a posteriori decoding, a commonly used method for neural machine translation (NMT), aims to maximize the estimated posterior probability. However, high estimated probability does not always lead to high translation quality. Minimum Bayes Risk (MBR) decoding offers an alternative by seeking h…

2024

Active Learning for Abstractive Text Summarization via LLM-Determined Curriculum and Certainty Gain Maximization

EMNLP 2024finding

For abstractive text summarization, laborious data annotation and time-consuming model training become two high walls, hindering its further progress. Active Learning, selecting a few informative instances for annotation and model training, sheds light on solving these issues. However, only few acti…

2024

Advancing Cross-domain Discriminability in Continual Learning of Vision-Language Models

NeurIPS 2024poster

Continual learning (CL) with Vision-Language Models (VLMs) has overcome the constraints of traditional CL, which only focuses on previously encountered classes. During the CL of VLMs, we need not only to prevent the catastrophic forgetting on incrementally learned knowledge but also to preserve the…

2024

Community-Invariant Graph Contrastive Learning

ICML 2024poster

Graph augmentation has received great attention in recent years for graph contrastive learning (GCL) to learn well-generalized node/graph representations. However, mainstream GCL methods often favor randomly disrupting graphs for augmentation, which shows limited generalization and inevitably leads…

2024

DiLM: Distilling Dataset into Language Model for Text-level Dataset Distillation

NAACL 2024findings

Dataset distillation aims to compress a training dataset by creating a small number of informative synthetic samples such that neural networks trained on them perform as well as those trained on the original training dataset. Current text dataset distillation methods create each synthetic sample as…

2024

InstructCMP: Length Control in Sentence Compression through Instruction-based Large Language Models

ACL 2024findings

Extractive summarization can produce faithful summaries but often requires additional constraints such as a desired summary length. Traditional sentence compression models do not typically consider the constraints because of their restricted model abilities, which require model modifications for cop…

2024

LAMBDA: Large Language Model-Based Data Augmentation for Multi-Modal Machine Translation

EMNLP 2024finding

Multi-modal machine translation (MMT) can reduce ambiguity and semantic distortion compared with traditional machine translation (MT) by utilizing auxiliary information such as images. However, current MMT methods face two primary challenges. The first is their underperformance compared to MT method…

2024

Video Discourse Parsing and Its Application to Multimodal Summarization: A Dataset and Baseline Approaches

EMNLP 2024finding

This paper tackles a new task: discourse parsing for videos, inspired by text discourse parsing based on Rhetorical Structure Theory (RST). The task aims to construct an RST tree for a video to represent its storyline and illustrate the event relationships. We first construct a benchmark dataset by…

2023

Bidirectional Transformer Reranker for Grammatical Error Correction

ACL 2023findings

Pre-trained seq2seq models have achieved state-of-the-art results in the grammatical error correction task. However, these models still suffer from a prediction bias due to their unidirectional decoding. Thus, we propose a bidirectional Transformer reranker (BTR), that re-estimates the probability o…

2023

Dataset Distillation with Attention Labels for Fine-tuning BERT

ACL 2023short

Dataset distillation aims to create a small dataset of informative synthetic samples to rapidly train neural networks that retain the performance of the original dataset. In this paper, we focus on constructing distilled few-shot datasets for natural language processing (NLP) tasks to fine-tune pre-…

Cited by 20SourcePDFScholar
2023

Focused Prefix Tuning for Controllable Text Generation

ACL 2023short

In a controllable text generation dataset, there exist unannotated attributes that could provide irrelevant learning signals to models that use it for training and thus degrade their performance. We propose focused prefix tuning (FPT) to mitigate the problem and to enable the control to focus on the…

Cited by 10SourcePDFScholar
2023

TACR: A Table Alignment-based Cell Selection Method for HybridQA

ACL 2023findings

Hybrid Question-Answering (HQA), which targets reasoning over tables and passages linked from table cells, has witnessed significant research in recent years. A common challenge in HQA and other passage-table QA datasets is that it is generally unrealistic to iterate over all table rows, columns, an…

Cited by 3SourcePDFScholar
2022

A Simple and Strong Baseline for End-to-End Neural RST-style Discourse Parsing

EMNLP 2022finding

To promote and further develop RST-style discourse parsing models, we need a strong baseline that can be regarded as a reference for reporting reliable experimental results. This paper explores a strong baseline by integrating existing simple parsing strategies, top-down and bottom-up, with various…

2022

A-TIP: Attribute-aware Text Infilling via Pre-trained Language Model

COLING 2022main

Text infilling aims to restore incomplete texts by filling in blanks, which has attracted more attention recently because of its wide application in ancient text restoration and text rewriting. However, attribute- aware text infilling is yet to be explored, and existing methods seldom focus on the i…

Cited by 16SourcePDFScholar
2022

Aspect-based Analysis of Advertising Appeals for Search Engine Advertising

NAACL 2022industry

Writing an ad text that attracts people and persuades them to click or act is essential for the success of search engine advertising. Therefore, ad creators must consider various aspects of advertising appeals (A3) such as the price, product features, and quality. However, products and services exhi…

Cited by 3SourcePDFScholar
2022

Exploiting Unlabeled Data for Target-Oriented Opinion Words Extraction

COLING 2022main

Target-oriented Opinion Words Extraction (TOWE) is a fine-grained sentiment analysis task that aims to extract the corresponding opinion words of a given opinion target from the sentence. Recently, deep learning approaches have made remarkable progress on this task. Nevertheless, the TOWE task still…

2022

Generating Repetitions with Appropriate Repeated Words

NAACL 2022long

A repetition is a response that repeats words in the previous speaker’s utterance in a dialogue. Repetitions are essential in communication to build trust with others, as investigated in linguistic studies. In this work, we focus on repetition generation. To the best of our knowledge, this is the fi…

2022

JPG - Jointly Learn to Align: Automated Disease Prediction and Radiology Report Generation

COLING 2022main

Automated radiology report generation aims to generate paragraphs that describe fine-grained visual differences among cases, especially those between the normal and the diseased. Existing methods seldom consider the cross-modal alignment between textual and visual features and tend to ignore disease…

2022

Joint Learning-based Heterogeneous Graph Attention Network for Timeline Summarization

NAACL 2022long

Previous studies on the timeline summarization (TLS) task ignored the information interaction between sentences and dates, and adopted pre-defined unlearnable representations for them. They also considered date selection and event detection as two independent tasks, which makes it impossible to inte…

2021

A Language Model-based Generative Classifier for Sentence-level Discourse Parsing

EMNLP 2021main

Discourse segmentation and sentence-level discourse parsing play important roles for various NLP tasks to consider textual coherence. Despite recent achievements in both tasks, there is still room for improvement due to the scarcity of labeled data. To solve the problem, we propose a language model-…

2021

An Empirical Study of Generating Texts for Search Engine Advertising

NAACL 2021industry

Although there are many studies on neural language generation (NLG), few trials are put into the real world, especially in the advertising domain. Generating ads with NLG models can help copywriters in their creation. However, few studies have adequately evaluated the effect of generated ads with ac…

2021

Considering Nested Tree Structure in Sentence Extractive Summarization with Pre-trained Transformer

EMNLP 2021main

Sentence extractive summarization shortens a document by selecting sentences for a summary while preserving its important contents. However, constructing a coherent and informative summary is difficult using a pre-trained BERT-based encoder since it is not explicitly trained for representing the inf…

2021

FlexMatch: Boosting Semi-Supervised Learning with Curriculum Pseudo Labeling

NeurIPS 2021poster

The recently proposed FixMatch achieved state-of-the-art results on most semi-supervised learning (SSL) benchmarks. However, like other modern SSL algorithms, FixMatch uses a pre-defined constant threshold for all classes to select unlabeled data that contribute to the training, thus failing to cons…

2021

Improving Neural RST Parsing Model with Silver Agreement Subtrees

NAACL 2021long

Most of the previous Rhetorical Structure Theory (RST) parsing methods are based on supervised learning such as neural networks, that require an annotated corpus of sufficient size and quality. However, the RST Discourse Treebank (RST-DT), the benchmark corpus for RST parsing in English, is small du…

2021

Towards Table-to-Text Generation with Numerical Reasoning

ACL 2021long

Recent neural text generation models have shown significant improvement in generating descriptive text from structured data such as table formats. One of the remaining important challenges is generating more analytical descriptions that can be inferred from facts in a data source. The use of a templ…

2020

Diverse and Non-redundant Answer Set Extraction on Community QA based on DPPs

COLING 2020main

In community-based question answering (CQA) platforms, it takes time for a user to get useful information from among many answers. Although one solution is an answer ranking method, the user still needs to read through the top-ranked answers carefully. This paper proposes a new task of selecting a d…

2020

Hierarchical Trivia Fact Extraction from Wikipedia Articles

COLING 2020main

Recently, automatic trivia fact extraction has attracted much research interest. Modern search engines have begun to provide trivia facts as the information for entities because they can motivate more user engagement. In this paper, we propose a new unsupervised algorithm that automatically mines tr…

Cited by 13SourcePDFScholar
2020

Neural text normalization leveraging similarities of strings and sounds

COLING 2020main

We propose neural models that can normalize text by considering the similarities of word strings and sounds. We experimentally compared a model that considers the similarities of both word strings and sounds, a model that considers only the similarity of word strings or of sounds, and a model withou…

Cited by 5SourcePDFScholar
2020

Pointing to Subwords for Generating Function Names in Source Code

COLING 2020main

We tackle the task of automatically generating a function name from source code. Existing generators face difficulties in generating low-frequency or out-of-vocabulary subwords. In this paper, we propose two strategies for copying low-frequency or out-of-vocabulary subwords in inputs. Our best perfo…

2020

SODA: Story Oriented Dense Video Captioning Evaluation Framework

ECCV 2020poster

Dense Video Captioning (DVC) is a challenging task that localizes all events in a short video and describes them with natural language sentences. The main goal of DVC is video story description, that is, to generate a concise video story that supports human video comprehension without watching it. I…