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Sima Behpour

10 accepted papers

2025

Open Ad-hoc Categorization with Contextualized Feature Learning

CVPR 2025poster

Adaptive categorization of visual scenes is essential for AI agents to handle changing tasks. Unlike fixed common categories for plants or animals, ad-hoc categories, such as things to sell at a garage sale, are created dynamically to achieve specific tasks. We study open ad-hoc categorization, wh…

2024

Hyp-OW: Exploiting Hierarchical Structure Learning with Hyperbolic Distance Enhances Open World Object Detection

AAAI 2024technical

Open World Object Detection (OWOD) is a challenging and realistic task that extends beyond the scope of standard Object Detection task. It involves detecting both known and unknown objects while integrating learned knowledge for future tasks. However, the level of "unknownness" varies significantly…

Cited by 23SourcePDFScholar
2024

MetaAT: Active Testing for Label-Efficient Evaluation of Dense Recognition Tasks

ECCV 2024poster

"In this study, we investigate the task of active testing for label-efficient evaluation, which aims to estimate a model’s performance on an unlabeled test dataset with a limited annotation budget. Previous approaches relied on deep ensemble models to identify highly informative instances for labeli…

Cited by 0SourcePDFScholar
2024

USE: Universal Segment Embeddings for Open-Vocabulary Image Segmentation

CVPR 2024poster

The open-vocabulary image segmentation task involves partitioning images into semantically meaningful segments and classifying them with flexible text-defined categories. The recent vision-based foundation models such as the Segment Anything Model (SAM) have shown superior performance in generating…

Cited by 5SourcePDFScholar
2023

GradOrth: A Simple yet Efficient Out-of-Distribution Detection with Orthogonal Projection of Gradients

NeurIPS 2023poster

Detecting out-of-distribution (OOD) data is crucial for ensuring the safe deployment of machine learning models in real-world applications. However, existing OOD detection approaches primarily rely on the feature maps or the full gradient space information to derive OOD scores neglecting the role of…

Cited by 16SourcePDFScholar
2023

UP-DP: Unsupervised Prompt Learning for Data Pre-Selection with Vision-Language Models

NeurIPS 2023poster

In this study, we investigate the task of data pre-selection, which aims to select instances for labeling from an unlabeled dataset through a single pass, thereby optimizing performance for undefined downstream tasks with a limited annotation budget. Previous approaches to data pre-selection relied…

Cited by 7SourcePDFScholar
2021

Sharing Less is More: Lifelong Learning in Deep Networks with Selective Layer Transfer

ICML 2021spotlight

Effective lifelong learning across diverse tasks requires the transfer of diverse knowledge, yet transferring irrelevant knowledge may lead to interference and catastrophic forgetting. In deep networks, transferring the appropriate granularity of knowledge is as important as the transfer mechanism,…

2021

Weakly Supervised 3D Semantic Segmentation Using Cross-Image Consensus and Inter-Voxel Affinity Relations

ICCV 2021poster

We propose a novel weakly supervised approach for 3D semantic segmentation on volumetric images. Unlike most existing methods that require voxel-wise densely labeled training data, our weakly-supervised CIVA-Net is the first model that only needs image-level class labels as guidance to learn accurat…

Cited by 20PDFcodeScholar
2019

Active Learning for Probabilistic Structured Prediction of Cuts and Matchings

ICML 2019oral

Active learning methods, like uncertainty sampling, combined with probabilistic prediction techniques have achieved success in various problems like image classification and text classification. For more complex multivariate prediction tasks, the relationships between labels play an important role i…

Cited by 8SourcePDFScholar