Search Results for author: Hongjun Choi

Found 9 papers, 4 papers with code

Fusion is Not Enough: Single Modal Attacks on Fusion Models for 3D Object Detection

no code implementations28 Apr 2023 Zhiyuan Cheng, Hongjun Choi, James Liang, Shiwei Feng, Guanhong Tao, Dongfang Liu, Michael Zuzak, Xiangyu Zhang

We argue that the weakest link of fusion models depends on their most vulnerable modality, and propose an attack framework that targets advanced camera-LiDAR fusion-based 3D object detection models through camera-only adversarial attacks.

3D Object Detection Autonomous Driving +2

Leveraging Angular Distributions for Improved Knowledge Distillation

no code implementations27 Feb 2023 Eun Som Jeon, Hongjun Choi, Ankita Shukla, Pavan Turaga

AMD loss uses the angular distance between positive and negative features by projecting them onto a hypersphere, motivated by the near angular distributions seen in many feature extractors.

Knowledge Distillation

Understanding the Role of Mixup in Knowledge Distillation: An Empirical Study

1 code implementation8 Nov 2022 Hongjun Choi, Eun Som Jeon, Ankita Shukla, Pavan Turaga

Mixup is a popular data augmentation technique based on creating new samples by linear interpolation between two given data samples, to improve both the generalization and robustness of the trained model.

Attribute Data Augmentation +4

Physical Attack on Monocular Depth Estimation with Optimal Adversarial Patches

1 code implementation11 Jul 2022 Zhiyuan Cheng, James Liang, Hongjun Choi, Guanhong Tao, Zhiwen Cao, Dongfang Liu, Xiangyu Zhang

Experimental results show that our method can generate stealthy, effective, and robust adversarial patches for different target objects and models and achieves more than 6 meters mean depth estimation error and 93% attack success rate (ASR) in object detection with a patch of 1/9 of the vehicle's rear area.

3D Object Detection Autonomous Driving +3

Interpretable COVID-19 Chest X-Ray Classification via Orthogonality Constraint

no code implementations2 Feb 2021 Ella Y. Wang, Anirudh Som, Ankita Shukla, Hongjun Choi, Pavan Turaga

In addition to these findings, our work also presents a new application of the OS regularizer in healthcare, increasing the post-hoc interpretability and performance of deep learning models for COVID-19 classification to facilitate adoption of these methods in clinical settings.

Classification Data Augmentation +1

Role of Orthogonality Constraints in Improving Properties of Deep Networks for Image Classification

no code implementations22 Sep 2020 Hongjun Choi, Anirudh Som, Pavan Turaga

Standard deep learning models that employ the categorical cross-entropy loss are known to perform well at image classification tasks.

General Classification Image Classification

Automatic Cross-Replica Sharding of Weight Update in Data-Parallel Training

no code implementations28 Apr 2020 Yuanzhong Xu, HyoukJoong Lee, Dehao Chen, Hongjun Choi, Blake Hechtman, Shibo Wang

In data-parallel synchronous training of deep neural networks, different devices (replicas) run the same program with different partitions of the training batch, but weight update computation is repeated on all replicas, because the weights do not have a batch dimension to partition.

AMC-Loss: Angular Margin Contrastive Loss for Improved Explainability in Image Classification

1 code implementation21 Apr 2020 Hongjun Choi, Anirudh Som, Pavan Turaga

We find that although the proposed geometrically constrained loss-function improves quantitative results modestly, it has a qualitatively surprisingly beneficial effect on increasing the interpretability of deep-net decisions as seen by the visual explanations generated by techniques such as the Grad-CAM.

General Classification Image Classification

PI-Net: A Deep Learning Approach to Extract Topological Persistence Images

1 code implementation5 Jun 2019 Anirudh Som, Hongjun Choi, Karthikeyan Natesan Ramamurthy, Matthew Buman, Pavan Turaga

To the best of our knowledge, we are the first to propose the use of deep learning for computing topological features directly from data.

Human Activity Recognition Image Classification +2

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