Search Results for author: Morteza Haghir Chehreghani

Found 41 papers, 4 papers with code

Less Is More - On the Importance of Sparsification for Transformers and Graph Neural Networks for TSP

no code implementations25 Mar 2024 Attila Lischka, Jiaming Wu, Rafael Basso, Morteza Haghir Chehreghani, Balázs Kulcsár

Furthermore, we propose ensembles of different sparsification levels allowing models to focus on the most promising parts while also allowing information flow between all nodes of a TSP instance.

Traveling Salesman Problem

Tactical Decision Making for Autonomous Trucks by Deep Reinforcement Learning with Total Cost of Operation Based Reward

no code implementations11 Mar 2024 Deepthi Pathare, Leo Laine, Morteza Haghir Chehreghani

We develop a deep reinforcement learning framework for tactical decision making in an autonomous truck, specifically for Adaptive Cruise Control (ACC) and lane change maneuvers in a highway scenario.

Decision Making reinforcement-learning

Effective Acquisition Functions for Active Correlation Clustering

no code implementations5 Feb 2024 Linus Aronsson, Morteza Haghir Chehreghani

Correlation clustering is a powerful unsupervised learning paradigm that supports positive and negative similarities.

Active Learning Clustering

Cost-Efficient Online Decision Making: A Combinatorial Multi-Armed Bandit Approach

no code implementations21 Aug 2023 Arman Rahbar, Niklas Åkerblom, Morteza Haghir Chehreghani

In this paper, we provide a novel formulation of the online decision making problem based on combinatorial multi-armed bandits and take the (possibly stochastic) cost of performing tests into account.

Decision Making Multi-Armed Bandits +1

Efficient Online Decision Tree Learning with Active Feature Acquisition

no code implementations3 May 2023 Arman Rahbar, Ziyu Ye, Yuxin Chen, Morteza Haghir Chehreghani

Specifically, we employ a surrogate information acquisition function based on adaptive submodularity to actively query feature values with a minimal cost, while using a posterior sampling scheme to maintain a low regret for online prediction.

Medical Diagnosis

Utilizing Reinforcement Learning for de novo Drug Design

2 code implementations30 Mar 2023 Hampus Gummesson Svensson, Christian Tyrchan, Ola Engkvist, Morteza Haghir Chehreghani

Deep learning-based approaches for generating novel drug molecules with specific properties have gained a lot of interest in the last few years.

reinforcement-learning

Prediction of Time and Distance of Trips Using Explainable Attention-based LSTMs

no code implementations27 Mar 2023 Ebrahim Balouji, Jonas Sjöblom, Nikolce Murgovski, Morteza Haghir Chehreghani

Finally, the last model is based on two parallel At-LSTMs, where similarly, each At-LSTM predicts time and distance separately through fully connected layers.

Correlation Clustering with Active Learning of Pairwise Similarities

no code implementations20 Feb 2023 Linus Aronsson, Morteza Haghir Chehreghani

Correlation clustering is a well-known unsupervised learning setting that deals with positive and negative pairwise similarities.

Active Learning Clustering

A Combinatorial Semi-Bandit Approach to Charging Station Selection for Electric Vehicles

no code implementations17 Jan 2023 Niklas Åkerblom, Morteza Haghir Chehreghani

In this work, we address the problem of long-distance navigation for battery electric vehicles (BEVs), where one or more charging sessions are required to reach the intended destination.

Combinatorial Optimization Thompson Sampling

Online Learning Models for Vehicle Usage Prediction During COVID-19

no code implementations28 Oct 2022 Tobias Lindroth, Axel Svensson, Niklas Åkerblom, Mitra Pourabdollah, Morteza Haghir Chehreghani

One way to mitigate these issues is by performing battery thermal preconditioning, which increases the energy efficiency of the battery.

TEP-GNN: Accurate Execution Time Prediction of Functional Tests using Graph Neural Networks

no code implementations25 Aug 2022 Hazem Peter Samoaa, Antonio Longa, Mazen Mohamad, Morteza Haghir Chehreghani, Philipp Leitner

TEP-GNN uses FA-ASTs, or flow-augmented ASTs, as a graph-based code representation approach, and predicts test execution times using a powerful graph neural network (GNN) deep learning model.

Benchmarking

Autonomous Drug Design with Multi-Armed Bandits

no code implementations4 Jul 2022 Hampus Gummesson Svensson, Esben Jannik Bjerrum, Christian Tyrchan, Ola Engkvist, Morteza Haghir Chehreghani

Recent developments in artificial intelligence and automation support a new drug design paradigm: autonomous drug design.

Multi-Armed Bandits

Passive and Active Learning of Driver Behavior from Electric Vehicles

no code implementations4 Mar 2022 Federica Comuni, Christopher Mészáros, Niklas Åkerblom, Morteza Haghir Chehreghani

To address the first challenge, passive learning of driver behavior, we investigate non-recurrent architectures such as self-attention models and convolutional neural networks with joint recurrence plots (JRP), and compare them with recurrent models.

Active Learning Informativeness

Deep Q-learning: a robust control approach

1 code implementation21 Jan 2022 Balazs Varga, Balazs Kulcsar, Morteza Haghir Chehreghani

The role of the target network is overtaken by the control input, which also exploits the temporal dependency of samples (opposed to a randomized memory buffer).

OpenAI Gym Q-Learning +1

Online Learning of Energy Consumption for Navigation of Electric Vehicles

no code implementations3 Nov 2021 Niklas Åkerblom, Yuxin Chen, Morteza Haghir Chehreghani

In order to learn the model parameters, we develop an online learning framework and investigate several exploration strategies such as Thompson Sampling and Upper Confidence Bound.

Navigate Thompson Sampling

Shift of Pairwise Similarities for Data Clustering

no code implementations25 Oct 2021 Morteza Haghir Chehreghani

Several clustering methods (e. g., Normalized Cut and Ratio Cut) divide the Min Cut cost function by a cluster dependent factor (e. g., the size or the degree of the clusters), in order to yield a more balanced partitioning.

Clustering

Active Learning of Driving Scenario Trajectories

no code implementations6 Aug 2021 Sanna Jarl, Linus Aronsson, Sadegh Rahrovani, Morteza Haghir Chehreghani

In this study, we develop a generic active learning framework to annotate driving trajectory time series data.

Active Learning Autonomous Vehicles +2

A Unified Framework for Online Trip Destination Prediction

no code implementations12 Jan 2021 Victor Eberstein, Jonas Sjöblom, Nikolce Murgovski, Morteza Haghir Chehreghani

In this paper, we present a unified framework for trip destination prediction in an online setting, which is suitable for both online training and online prediction.

Autonomous Driving Clustering

A Generic Framework for Clustering Vehicle Motion Trajectories

no code implementations25 Sep 2020 Fazeleh S. Hoseini, Sadegh Rahrovani, Morteza Haghir Chehreghani

The development of autonomous vehicles requires having access to a large amount of data in the concerning driving scenarios.

Autonomous Vehicles Clustering +2

Model-Centric and Data-Centric Aspects of Active Learning for Deep Neural Networks

no code implementations22 Sep 2020 John Daniel Bossér, Erik Sörstadius, Morteza Haghir Chehreghani

v) We investigate how active learning with neural networks can benefit from pseudo-labels as proxies for actual labels.

Active Learning Informativeness

A Deep Learning Framework for Generation and Analysis of Driving Scenario Trajectories

no code implementations28 Jul 2020 Andreas Demetriou, Henrik Alfsvåg, Sadegh Rahrovani, Morteza Haghir Chehreghani

Second, we develop an architecture based on Recurrent Autoencoder with GANs to obviate the variable length issue, wherein we train a GAN to learn/generate the latent representations of original trajectories.

Anomaly Detection Autonomous Driving +2

Efficient Optimization of Dominant Set Clustering with Frank-Wolfe Algorithms

no code implementations22 Jul 2020 Carl Johnell, Morteza Haghir Chehreghani

We study Frank-Wolfe algorithms - standard, pairwise, and away-steps - for efficient optimization of Dominant Set Clustering.

Clustering

Memory-Efficient Sampling for Minimax Distance Measures

no code implementations26 May 2020 Fazeleh Sadat Hoseini, Morteza Haghir Chehreghani

Minimax distance measure extracts the underlying patterns and manifolds in an unsupervised manner.

Analysis of Knowledge Transfer in Kernel Regime

no code implementations30 Mar 2020 Arman Rahbar, Ashkan Panahi, Chiranjib Bhattacharyya, Devdatt Dubhashi, Morteza Haghir Chehreghani

Knowledge transfer is shown to be a very successful technique for training neural classifiers: together with the ground truth data, it uses the "privileged information" (PI) obtained by a "teacher" network to train a "student" network.

Knowledge Distillation Transfer Learning

An Online Learning Framework for Energy-Efficient Navigation of Electric Vehicles

no code implementations3 Mar 2020 Niklas Åkerblom, Yuxin Chen, Morteza Haghir Chehreghani

In order to learn the model parameters, we develop an online learning framework and investigate several exploration strategies such as Thompson Sampling and Upper Confidence Bound.

Navigate Thompson Sampling

Hierarchical Correlation Clustering and Tree Preserving Embedding

no code implementations18 Feb 2020 Morteza Haghir Chehreghani, Mostafa Haghir Chehreghani

We propose a hierarchical correlation clustering method that extends the well-known correlation clustering to produce hierarchical clusters applicable to both positive and negative pairwise dissimilarities.

Clustering Representation Learning

Lifelong Learning Starting From Zero

no code implementations24 Jun 2019 Claes Strannegård, Herman Carlström, Niklas Engsner, Fredrik Mäkeläinen, Filip Slottner Seholm, Morteza Haghir Chehreghani

We present a deep neural-network model for lifelong learning inspired by several forms of neuroplasticity.

Do Kernel and Neural Embeddings Help in Training and Generalization?

no code implementations13 May 2019 Arman Rahbar, Emilio Jorge, Devdatt Dubhashi, Morteza Haghir Chehreghani

The approximated representations induced by these kernels are fed to the neural network and the optimization and generalization properties of the final model are evaluated and compared.

General Classification

Unsupervised Representation Learning with Minimax Distance Measures

no code implementations27 Apr 2019 Morteza Haghir Chehreghani

We investigate the use of Minimax distances to extract in a nonparametric way the features that capture the unknown underlying patterns and structures in the data.

Representation Learning

Trip Prediction by Leveraging Trip Histories from Neighboring Users

no code implementations25 Dec 2018 Yuxin Chen, Morteza Haghir Chehreghani

We propose a novel approach for trip prediction by analyzing user's trip histories.

Learning Representations from Dendrograms

no code implementations21 Dec 2018 Morteza Haghir Chehreghani, Mostafa Haghir Chehreghani

Then, to address the model selection problem, we study the aggregation of different dendrogram-based distances respectively in solution space and in representation space in the spirit of deep representations.

Clustering Model Selection +1

Reliable Agglomerative Clustering

no code implementations20 Dec 2018 Morteza Haghir Chehreghani

Standard agglomerative clustering suggests establishing a new reliable linkage at every step.

Clustering

Efficient Online Learning for Optimizing Value of Information: Theory and Application to Interactive Troubleshooting

no code implementations16 Mar 2017 Yuxin Chen, Jean-Michel Renders, Morteza Haghir Chehreghani, Andreas Krause

We consider the optimal value of information (VoI) problem, where the goal is to sequentially select a set of tests with a minimal cost, so that one can efficiently make the best decision based on the observed outcomes.

Cannot find the paper you are looking for? You can Submit a new open access paper.