Search Results for author: Koby Bibas

Found 11 papers, 3 papers with code

Semi-supervised Adversarial Learning for Complementary Item Recommendation

no code implementations10 Mar 2023 Koby Bibas, Oren Sar Shalom, Dietmar Jannach

In this work, we propose a novel approach that can leverage both item side-information and labeled complementary item pairs to generate effective complementary recommendations for cold items, i. e., for items for which no co-purchase statistics yet exist.

Collaborative Image Understanding

no code implementations21 Oct 2022 Koby Bibas, Oren Sar Shalom, Dietmar Jannach

A series of experiments on datasets from e-commerce and social media demonstrates that considering collaborative signals helps to significantly improve the performance of the main task of image classification by up to 9. 1%.

Image Classification

Beyond Ridge Regression for Distribution-Free Data

no code implementations17 Jun 2022 Koby Bibas, Meir Feder

In the context of online prediction where the min-max solution is the Normalized Maximum Likelihood (NML), it has been suggested to use NML with ``luckiness'': A prior-like function is applied to the hypothesis class, which reduces its effective size.

regression

Single Layer Predictive Normalized Maximum Likelihood for Out-of-Distribution Detection

1 code implementation NeurIPS 2021 Koby Bibas, Meir Feder, Tal Hassner

Furthermore, we describe how to efficiently apply the derived pNML regret to any pretrained deep NN, by employing the explicit pNML for the last layer, followed by the softmax function.

Out-of-Distribution Detection Out of Distribution (OOD) Detection

Utilizing Adversarial Targeted Attacks to Boost Adversarial Robustness

no code implementations4 Sep 2021 Uriya Pesso, Koby Bibas, Meir Feder

Specifically, our defense performs adversarial targeted attacks according to different hypotheses, where each hypothesis assumes a specific label for the test sample.

Adversarial Attack Adversarial Robustness

Distribution Free Uncertainty for the Minimum Norm Solution of Over-parameterized Linear Regression

no code implementations14 Feb 2021 Koby Bibas, Meir Feder

Modern machine learning models do not obey this paradigm: They produce an accurate prediction even with a perfect fit to the training set.

Learning Theory regression

Learning Rotation Invariant Features for Cryogenic Electron Microscopy Image Reconstruction

no code implementations10 Jan 2021 Koby Bibas, Gili Weiss-Dicker, Dana Cohen, Noa Cahan, Hayit Greenspan

A fundamental step in the recovering of the 3D single-particle structure is to align its 2D projections; thus, the construction of a canonical representation with a fixed rotation angle is required.

Clustering Image Reconstruction +1

Balancing Specialization, Generalization, and Compression for Detection and Tracking

no code implementations25 Sep 2019 Dotan Kaufman, Koby Bibas, Eran Borenstein, Michael Chertok, Tal Hassner

To this end, we propose a novel loss that balances compression and acceleration of a deep learning model vs. loss of generalization capabilities.

Model Compression

Universal Learning Approach for Adversarial Defense

no code implementations25 Sep 2019 Uriya Pesso, Koby Bibas, Meir Feder

In particular, we follow the recently suggested Predictive Normalized Maximum Likelihood (pNML) scheme for universal learning, whose goal is to optimally compete with a reference learner that knows the true label of the test sample but is restricted to use a learner from a given hypothesis class.

Adversarial Defense

Deep pNML: Predictive Normalized Maximum Likelihood for Deep Neural Networks

1 code implementation28 Apr 2019 Koby Bibas, Yaniv Fogel, Meir Feder

Finally, we extend the pNML to a ``twice universal'' solution, that provides universality for model class selection and generates a learner competing with the best one from all model classes.

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