Search Results for author: Ofer M. Shir

Found 13 papers, 1 papers with code

Addressing Unboundedness in Quadratically-Constrained Mixed-Integer Problems

no code implementations6 May 2024 Guy Zepko, Ofer M. Shir

Mixed-integer (MI) quadratic models subject to quadratic constraints, known as All-Quadratic MI Programs, constitute a challenging class of NP-complete optimization problems.

Avoiding Redundant Restarts in Multimodal Global Optimization

no code implementations2 May 2024 Jacob de Nobel, Diederick Vermetten, Anna V. Kononova, Ofer M. Shir, Thomas Bäck

Na\"ive restarts of global optimization solvers when operating on multimodal search landscapes may resemble the Coupon's Collector Problem, with a potential to waste significant function evaluations budget on revisiting the same basins of attractions.

Lessons Learned Report: Super-Resolution for Detection Tasks in Engineering Problem-Solving

no code implementations1 Mar 2023 Martin Feder, Michal Horovitz, Assaf Chen, Raphael Linker, Ofer M. Shir

We describe the lessons learned from targeting agricultural detection problem-solving, when subject to low resolution input maps, by means of Machine Learning-based super-resolution approaches.

Super-Resolution

Saliency Can Be All You Need In Contrastive Self-Supervised Learning

no code implementations30 Oct 2022 Veysel Kocaman, Ofer M. Shir, Thomas Bäck, Ahmed Nabil Belbachir

We propose an augmentation policy for Contrastive Self-Supervised Learning (SSL) in the form of an already established Salient Image Segmentation technique entitled Global Contrast based Salient Region Detection.

Image Segmentation Segmentation +2

Toward an ImageNet Library of Functions for Global Optimization Benchmarking

no code implementations27 Jun 2022 Boris Yazmir, Ofer M. Shir

Knowledge of search-landscape features of BlackBox Optimization (BBO) problems offers valuable information in light of the Algorithm Selection and/or Configuration problems.

Benchmarking

The Unreasonable Effectiveness of the Final Batch Normalization Layer

no code implementations18 Sep 2021 Veysel Kocaman, Ofer M. Shir, Thomas Baeck

Early-stage disease indications are rarely recorded in real-world domains, such as Agriculture and Healthcare, and yet, their accurate identification is critical in that point of time.

Image Classification imbalanced classification

Improving Model Accuracy for Imbalanced Image Classification Tasks by Adding a Final Batch Normalization Layer: An Empirical Study

no code implementations12 Nov 2020 Veysel Kocaman, Ofer M. Shir, Thomas Bäck

We empirically observe that the initial F1 test score jumps from 0. 29 to 0. 95 for the minority class upon adding a final Batch Normalization (BN) layer just before the output layer in VGG19.

Image Classification imbalanced classification +1

Multi-Level Evolution Strategies for High-Resolution Black-Box Control

no code implementations4 Oct 2020 Ofer M. Shir, Xi Xing, Herschel Rabitz

Such problems arise in engineering and scientific applications, which possess a multi-resolution control nature, and thus may be formulated either by means of low-resolution variants (providing coarser approximations with presumably lower accuracy for the general problem) or by high-resolution controls.

Vocal Bursts Intensity Prediction

Benchmarking Discrete Optimization Heuristics with IOHprofiler

no code implementations19 Dec 2019 Carola Doerr, Furong Ye, Naama Horesh, Hao Wang, Ofer M. Shir, Thomas Bäck

Automated benchmarking environments aim to support researchers in understanding how different algorithms perform on different types of optimization problems.

Benchmarking

On the Covariance-Hessian Relation in Evolution Strategies

1 code implementation10 Jun 2018 Ofer M. Shir, Amir Yehudayoff

We consider Evolution Strategies operating only with isotropic Gaussian mutations on positive quadratic objective functions, and investigate the covariance matrix when constructed out of selected individuals by truncation.

Relation

Protein design by multiobjective optimization: evolutionary and non-evolutionary approaches

no code implementations1 Jul 2017 01 July 2017Sandeep V. Belure, Ofer M. Shir, Vikas Nanda

We formulate a bi-objective combinatorial minimization problem that targets both stability and specificity of the 4-level heterotrimer.

Combinatorial Optimization Efficient Exploration +3

On the Theoretical Capacity of Evolution Strategies to Statistically Learn the Landscape Hessian

no code implementations23 Jun 2016 Ofer M. Shir, Jonathan Roslund, Amir Yehudayoff

We study the theoretical capacity to statistically learn local landscape information by Evolution Strategies (ESs).

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