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Daiki Chijiwa

12 accepted papers

2026

Do We Really Need Permutations? Impact of Width Expansion on Linear Mode Connectivity

ICLR 2026poster

Recently, Ainsworth et al. empirically demonstrated that, given two independently trained models, applying a parameter permutation that preserves the input–output behavior allows the two models to be connected by a low-loss linear path. When such a path exists, the models are said to achieve linear…

Cited by 0SourceScholar
2026

Lossless Vocabulary Reduction for Auto-Regressive Language Models

ICLR 2026poster

Tokenization---the process of decomposing a given text into a sequence of subwords called tokens---is one of the key components in the development of language models. Particularly, auto-regressive language models generate texts token by token, i.e., by predicting the next-token distribution given th…

Cited by 0SourceScholar
2026

The Strong Lottery Ticket Hypothesis for Multi-Head Attention Mechanisms

AAAI 2026technical

The strong lottery ticket hypothesis (SLTH) conjectures that high-performing subnetworks, called strong lottery tickets (SLTs), are hidden in randomly initialized neural networks. Although recent theoretical studies have established the SLTH across various neural architectures, the SLTH for transfor

Cited by 0SourcePDFScholar
2025

Plausible Token Amplification for Improving Accuracy of Differentially Private In-Context Learning Based on Implicit Bayesian Inference

ICML 2025poster

We propose Plausible Token Amplification (PTA) to improve the accuracy of Differentially Private In-Context Learning (DP-ICL) using DP synthetic demonstrations. While Tang et al. empirically improved the accuracy of DP-ICL by limiting vocabulary space during DP synthetic demonstration generation, it…

Cited by 0SourcePDFScholar
2025

Portable Reward Tuning: Towards Reusable Fine-Tuning across Different Pretrained Models

ICML 2025poster

While foundation models have been exploited for various expert tasks with their fine-tuned parameters, any foundation model will be eventually outdated due to its old knowledge or limited capability, and thus should be replaced by a new foundation model. Subsequently, to benefit from its latest know…

Cited by 1SourcePDFScholar
2025

Post-pre-training for Modality Alignment in Vision-Language Foundation Models

CVPR 2025poster

Contrastive language image pre-training (CLIP) is an essential component of building modern vision-language foundation models. While CLIP demonstrates remarkable zero-shot performance on downstream tasks, the multi-modal feature spaces still suffer from a modality gap, which is a gap between image a…

2024

Adaptive Random Feature Regularization on Fine-tuning Deep Neural Networks

CVPR 2024poster

While fine-tuning is a de facto standard method for training deep neural networks it still suffers from overfitting when using small target datasets. Previous methods improve fine-tuning performance by maintaining knowledge of the source datasets or introducing regularization terms such as contrasti…

Cited by 1SourcePDFScholar
2023

Regularizing Neural Networks with Meta-Learning Generative Models

NeurIPS 2023poster

This paper investigates methods for improving generative data augmentation for deep learning. Generative data augmentation leverages the synthetic samples produced by generative models as an additional dataset for classification with small dataset settings. A key challenge of generative data augment…

Cited by 4SourcePDFScholar
2022

Meta-ticket: Finding optimal subnetworks for few-shot learning within randomly initialized neural networks

NeurIPS 2022accept

Few-shot learning for neural networks (NNs) is an important problem that aims to train NNs with a few data. The main challenge is how to avoid overfitting since over-parameterized NNs can easily overfit to such small dataset. Previous work (e.g. MAML by Finn et al. 2017) tackles this challenge by me…

2021

Pruning Randomly Initialized Neural Networks with Iterative Randomization

NeurIPS 2021spotlight

Pruning the weights of randomly initialized neural networks plays an important role in the context of lottery ticket hypothesis. Ramanujan et al. (2020) empirically showed that only pruning the weights can achieve remarkable performance instead of optimizing the weight values. However, to achieve th…