Search Results for author: Nina Wiedemann

Found 12 papers, 8 papers with code

Where you go is who you are -- A study on machine learning based semantic privacy attacks

1 code implementation26 Oct 2023 Nina Wiedemann, Ourania Kounadi, Martin Raubal, Krzysztof Janowicz

Concerns about data privacy are omnipresent, given the increasing usage of digital applications and their underlying business model that includes selling user data.

Uncertainty Quantification for Image-based Traffic Prediction across Cities

1 code implementation11 Aug 2023 Alexander Timans, Nina Wiedemann, Nishant Kumar, Ye Hong, Martin Raubal

We compare two epistemic and two aleatoric UQ methods on both temporal and spatio-temporal transfer tasks, and find that meaningful uncertainty estimates can be recovered.

Decision Making Decision Making Under Uncertainty +3

Spatially-Aware Car-Sharing Demand Prediction

no code implementations25 Mar 2023 Dominik J. Mühlematter, Nina Wiedemann, Yanan Xin, Martin Raubal

In particular, we compare the spatially-implicit Random Forest model with spatially-aware methods for predicting average monthly per-station demand.

Metropolitan Segment Traffic Speeds from Massive Floating Car Data in 10 Cities

1 code implementation17 Feb 2023 Moritz Neun, Christian Eichenberger, Yanan Xin, Cheng Fu, Nina Wiedemann, Henry Martin, Martin Tomko, Lukas Ambühl, Luca Hermes, Michael Kopp

Traffic analysis is crucial for urban operations and planning, while the availability of dense urban traffic data beyond loop detectors is still scarce.

Privacy Preserving

National-scale bi-directional EV fleet control for ancillary service provision

no code implementations14 Oct 2022 Lorenzo Nespoli, Nina Wiedemann, Esra Suel, Yanan Xin, Martin Raubal, Vasco Medici

Deploying real-time control on large-scale fleets of electric vehicles (EVs) is becoming pivotal as the share of EVs over internal combustion engine vehicles increases.

Training Efficient Controllers via Analytic Policy Gradient

1 code implementation26 Sep 2022 Nina Wiedemann, Valentin Wüest, Antonio Loquercio, Matthias Müller, Dario Floreano, Davide Scaramuzza

Conversely, learning-based offline optimization approaches, such as Reinforcement Learning (RL), allow fast and efficient execution on the robot but hardly match the accuracy of MPC in trajectory tracking tasks.

Model Predictive Control Reinforcement Learning (RL)

Traffic Forecasting on Traffic Moving Snippets

1 code implementation27 Oct 2021 Nina Wiedemann, Martin Raubal

With the performance on the traffic4cast test data and further experiments on a validation set it is shown that patch-wise prediction indeed improves accuracy.

Traffic Prediction

Jointly Learning Identification and Control for Few-Shot Policy Adaptation

no code implementations29 Sep 2021 Nina Wiedemann, Antonio Loquercio, Matthias Müller, Rene Ranftl, Davide Scaramuzza

We evaluate our approach on several complex systems and tasks, and experimentally analyze the advantages over model-free and model-based methods in terms of performance and sample efficiency.

POCOVID-Net: Automatic Detection of COVID-19 From a New Lung Ultrasound Imaging Dataset (POCUS)

5 code implementations25 Apr 2020 Jannis Born, Gabriel Brändle, Manuel Cossio, Marion Disdier, Julie Goulet, Jérémie Roulin, Nina Wiedemann

For detecting COVID-19 in particular, the model performs with a sensitivity of 0. 96, a specificity of 0. 79 and F1-score of 0. 92 in a 5-fold cross validation.

Specificity

A Tracking System For Baseball Game Reconstruction

no code implementations8 Mar 2020 Nina Wiedemann, Carlos Dietrich, Claudio T. Silva

The baseball game is often seen as many contests that are performed between individuals.

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