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Deep learning has potential to automate screening, monitoring and grading of disease in medical images. Pretraining with contrastive learning enables models to extract robust and generalisable features from natural image datasets,…

A key challenge in training neural networks for a given medical imaging task is often the difficulty of obtaining a sufficient number of manually labeled examples. In contrast, textual imaging reports, which are often readily available in…

Machine Learning · Computer Science 2022-01-31 Gongbo Liang , Connor Greenwell , Yu Zhang , Xiaoqin Wang , Ramakanth Kavuluru , Nathan Jacobs

Contrastive learning enables learning useful audio and speech representations without ground-truth labels by maximizing the similarity between latent representations of similar signal segments. In this framework various data augmentation…

Audio and Speech Processing · Electrical Eng. & Systems 2022-04-11 Salah Zaiem , Titouan Parcollet , Slim Essid

Contrastive instance discrimination methods outperform supervised learning in downstream tasks such as image classification and object detection. However, these methods rely heavily on data augmentation during representation learning, which…

Computer Vision and Pattern Recognition · Computer Science 2025-04-21 Mohammad Alkhalefi , Georgios Leontidis , Mingjun Zhong

Recent literature in self-supervised has demonstrated significant progress in closing the gap between supervised and unsupervised methods in the image and text domains. These methods rely on domain-specific augmentations that are not…

Machine Learning · Computer Science 2021-09-02 Sajad Darabi , Shayan Fazeli , Ali Pazoki , Sriram Sankararaman , Majid Sarrafzadeh

Medical images and reports offer invaluable insights into patient health. The heterogeneity and complexity of these data hinder effective analysis. To bridge this gap, we investigate contrastive learning models for cross-domain retrieval,…

Computer Vision and Pattern Recognition · Computer Science 2025-01-17 Demetrio Deanda , Yuktha Priya Masupalli , Jeong Yang , Young Lee , Zechun Cao , Gongbo Liang

Self-supervised learning aims to learn a embedding space where semantically similar samples are close. Contrastive learning methods pull views of samples together and push different samples away, which utilizes semantic invariance of…

Machine Learning · Computer Science 2023-02-17 Lu Han , Han-Jia Ye , De-Chuan Zhan

Contrastive representation learning has been outstandingly successful in practice. In this work, we identify two key properties related to the contrastive loss: (1) alignment (closeness) of features from positive pairs, and (2) uniformity…

Machine Learning · Computer Science 2022-08-17 Tongzhou Wang , Phillip Isola

Dense retrievers have achieved impressive performance, but their demand for abundant training data limits their application scenarios. Contrastive pre-training, which constructs pseudo-positive examples from unlabeled data, has shown great…

Information Retrieval · Computer Science 2023-06-07 Yibin Lei , Liang Ding , Yu Cao , Changtong Zan , Andrew Yates , Dacheng Tao

Data augmentation plays a pivotal role in enhancing and diversifying training data. Nonetheless, consistently improving model performance in varied learning scenarios, especially those with inherent data biases, remains challenging. To…

Machine Learning · Computer Science 2024-06-04 Xiaoling Zhou , Wei Ye , Zhemg Lee , Rui Xie , Shikun Zhang

The prediction of adaptive radiation therapy (ART) prior to radiation therapy (RT) for nasopharyngeal carcinoma (NPC) patients is important to reduce toxicity and prolong the survival of patients. Currently, due to the complex tumor…

Computer Vision and Pattern Recognition · Computer Science 2022-10-28 Jiabao Sheng , Yuanpeng Zhang , Jing Cai , Sai-Kit Lam , Zhe Li , Jiang Zhang , Xinzhi Teng

Contrastive self-supervised learning (CSL) has managed to match or surpass the performance of supervised learning in image and video classification. However, it is still largely unknown if the nature of the representations induced by the…

Computer Vision and Pattern Recognition · Computer Science 2022-11-22 Rohit Gupta , Naveed Akhtar , Ajmal Mian , Mubarak Shah

Well-annotated medical datasets enable deep neural networks (DNNs) to gain strong power in extracting lesion-related features. Building such large and well-designed medical datasets is costly due to the need for high-level expertise. Model…

Computer Vision and Pattern Recognition · Computer Science 2022-12-09 Yixiong Chen , Chunhui Zhang , Chris H. Q. Ding , Li Liu

Self-supervised learning has become a popular approach in recent years for its ability to learn meaningful representations without the need for data annotation. This paper proposes a novel image augmentation technique, overlaying images,…

Computer Vision and Pattern Recognition · Computer Science 2023-01-25 Yinheng Li , Han Ding , Shaofei Wang

Self-supervised contrastive learning has emerged as a powerful tool in machine learning and computer vision to learn meaningful representations from unlabeled data. Meanwhile, its empirical success has encouraged many theoretical studies to…

Machine Learning · Computer Science 2025-05-29 Jingyi Cui , Hongwei Wen , Yisen Wang

Contrastive learning-based recommendation algorithms have significantly advanced the field of self-supervised recommendation, particularly with BPR as a representative ranking prediction task that dominates implicit collaborative filtering.…

Information Retrieval · Computer Science 2024-03-13 Shipeng Song , Bin Liu , Fei Teng , Tianrui Li

Contrastive representation learning seeks to acquire useful representations by estimating the shared information between multiple views of data. Here, the choice of data augmentation is sensitive to the quality of learned representations:…

Machine Learning · Statistics 2023-01-18 Kyungmin Lee , Jinwoo Shin

Contrastive learning has recently demonstrated superior performance to supervised learning, despite requiring no training labels. We explore how contrastive learning can be applied to hundreds of thousands of unlabeled Mars terrain images,…

Computer Vision and Pattern Recognition · Computer Science 2022-10-18 Isaac Ronald Ward , Charles Moore , Kai Pak , Jingdao Chen , Edwin Goh

Recent progress in self-supervised learning has demonstrated promising results in multiple visual tasks. An important ingredient in high-performing self-supervised methods is the use of data augmentation by training models to place…

Computer Vision and Pattern Recognition · Computer Science 2021-11-15 Chaitanya K. Ryali , David J. Schwab , Ari S. Morcos

Many contrastive representation learning methods learn a single global representation of an entire image. However, dense contrastive representation learning methods such as DenseCL (Wang et al., 2021) can learn better representations for…

Computer Vision and Pattern Recognition · Computer Science 2023-01-12 Berk Iskender , Zhenlin Xu , Simon Kornblith , En-Hung Chu , Maryam Khademi