Search Results for author: Junjiao Tian

Found 19 papers, 8 papers with code

HePCo: Data-Free Heterogeneous Prompt Consolidation for Continual Federated Learning

no code implementations16 Jun 2023 Shaunak Halbe, James Seale Smith, Junjiao Tian, Zsolt Kira

In this paper, we attempt to tackle forgetting and heterogeneity while minimizing overhead costs and without requiring access to any stored data.

Federated Learning Image Classification

Trainable Projected Gradient Method for Robust Fine-tuning

2 code implementations CVPR 2023 Junjiao Tian, Xiaoliang Dai, Chih-Yao Ma, Zecheng He, Yen-Cheng Liu, Zsolt Kira

To solve this problem, we propose Trainable Projected Gradient Method (TPGM) to automatically learn the constraint imposed for each layer for a fine-grained fine-tuning regularization.

Transfer Learning

Polyhistor: Parameter-Efficient Multi-Task Adaptation for Dense Vision Tasks

no code implementations7 Oct 2022 Yen-Cheng Liu, Chih-Yao Ma, Junjiao Tian, Zijian He, Zsolt Kira

Specifically, Polyhistor achieves competitive accuracy compared to the state-of-the-art while only using ~10% of their trainable parameters.

FedFOR: Stateless Heterogeneous Federated Learning with First-Order Regularization

1 code implementation21 Sep 2022 Junjiao Tian, James Seale Smith, Zsolt Kira

For the more typical applications of FL where the number of clients is large (e. g., edge-device and mobile applications), these methods cannot be applied, motivating the need for a stateless approach to heterogeneous FL which can be used for any number of clients.

Federated Learning

Open-Set Semi-Supervised Object Detection

no code implementations29 Aug 2022 Yen-Cheng Liu, Chih-Yao Ma, Xiaoliang Dai, Junjiao Tian, Peter Vajda, Zijian He, Zsolt Kira

To address this problem, we consider online and offline OOD detection modules, which are integrated with SSOD methods.

Object object-detection +3

A Closer Look at Rehearsal-Free Continual Learning

no code implementations31 Mar 2022 James Seale Smith, Junjiao Tian, Shaunak Halbe, Yen-Chang Hsu, Zsolt Kira

Next, we explore how to leverage knowledge from a pre-trained model in rehearsal-free continual learning and find that vanilla L2 parameter regularization outperforms EWC parameter regularization and feature distillation.

Continual Learning Knowledge Distillation +2

Exploring Covariate and Concept Shift for Detection and Calibration of Out-of-Distribution Data

no code implementations28 Oct 2021 Junjiao Tian, Yen-Change Hsu, Yilin Shen, Hongxia Jin, Zsolt Kira

We are the first to propose a method that works well across both OOD detection and calibration and under different types of shifts.

Out of Distribution (OOD) Detection

A Geometric Perspective towards Neural Calibration via Sensitivity Decomposition

1 code implementation NeurIPS 2021 Junjiao Tian, Dylan Yung, Yen-Chang Hsu, Zsolt Kira

It is well known that vision classification models suffer from poor calibration in the face of data distribution shifts.

Exploring Covariate and Concept Shift for Detection and Confidence Calibration of Out-of-Distribution Data

no code implementations29 Sep 2021 Junjiao Tian, Yen-Chang Hsu, Yilin Shen, Hongxia Jin, Zsolt Kira

To this end, we theoretically derive two score functions for OOD detection, the covariate shift score and concept shift score, based on the decomposition of KL-divergence for both scores, and propose a geometrically-inspired method (Geometric ODIN) to improve OOD detection under both shifts with only in-distribution data.

Out of Distribution (OOD) Detection

Enhancing Multi-Robot Perception via Learned Data Association

no code implementations1 Jul 2021 Nathaniel Glaser, Yen-Cheng Liu, Junjiao Tian, Zsolt Kira

In this paper, we address the multi-robot collaborative perception problem, specifically in the context of multi-view infilling for distributed semantic segmentation.

Semantic Segmentation

Overcoming Obstructions via Bandwidth-Limited Multi-Agent Spatial Handshaking

no code implementations1 Jul 2021 Nathaniel Glaser, Yen-Cheng Liu, Junjiao Tian, Zsolt Kira

In this paper, we address bandwidth-limited and obstruction-prone collaborative perception, specifically in the context of multi-agent semantic segmentation.

Semantic Segmentation

Striking the Right Balance: Recall Loss for Semantic Segmentation

1 code implementation28 Jun 2021 Junjiao Tian, Niluthpol Mithun, Zach Seymour, Han-Pang Chiu, Zsolt Kira

There are two major drawbacks to these methods: 1) constantly up-weighting minority classes can introduce excessive false positives in semantic segmentation; 2) a minority class is not necessarily a hard class.

Semantic Segmentation

Recall Loss for Imbalanced Image Classification and Semantic Segmentation

1 code implementation1 Jan 2021 Junjiao Tian, Niluthpol Chowdhury Mithun, Zachary Seymour, Han-Pang Chiu, Zsolt Kira

Many works have proposed to weigh the standard cross entropy loss function with pre-computed weights based on class statistics such as the number of samples and class margins.

Classification General Classification +4

Posterior Re-calibration for Imbalanced Datasets

no code implementations NeurIPS 2020 Junjiao Tian, Yen-Cheng Liu, Nathan Glaser, Yen-Chang Hsu, Zsolt Kira

Neural Networks can perform poorly when the training label distribution is heavily imbalanced, as well as when the testing data differs from the training distribution.

Long-tail Learning Semantic Segmentation

Image Captioning with Compositional Neural Module Networks

no code implementations10 Jul 2020 Junjiao Tian, Jean Oh

In image captioning where fluency is an important factor in evaluation, e. g., $n$-gram metrics, sequential models are commonly used; however, sequential models generally result in overgeneralized expressions that lack the details that may be present in an input image.

Image Captioning Question Answering +2

When2com: Multi-Agent Perception via Communication Graph Grouping

2 code implementations CVPR 2020 Yen-Cheng Liu, Junjiao Tian, Nathaniel Glaser, Zsolt Kira

While significant advances have been made for single-agent perception, many applications require multiple sensing agents and cross-agent communication due to benefits such as coverage and robustness.

Who2com: Collaborative Perception via Learnable Handshake Communication

1 code implementation21 Mar 2020 Yen-Cheng Liu, Junjiao Tian, Chih-Yao Ma, Nathan Glaser, Chia-Wen Kuo, Zsolt Kira

In this paper, we propose the problem of collaborative perception, where robots can combine their local observations with those of neighboring agents in a learnable way to improve accuracy on a perception task.

Multi-agent Reinforcement Learning Scene Understanding +1

UNO: Uncertainty-aware Noisy-Or Multimodal Fusion for Unanticipated Input Degradation

no code implementations6 Nov 2019 Junjiao Tian, Wesley Cheung, Nathan Glaser, Yen-Cheng Liu, Zsolt Kira

Specifically, we analyze a number of uncertainty measures, each of which captures a different aspect of uncertainty, and we propose a novel way to fuse degraded inputs by scaling modality-specific output softmax probabilities.

Semantic Segmentation

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