Machine-learning-nederland August 2023

machine-learning-nederland@list.uva.nl

2 participants
3 discussions

Reminder: Stats and ML thematic seminar: Chloe Rouyer
by Dirk van der Hoeven 30 Aug '23

30 Aug '23

Dear all,, This is a reminder that on Thursday august 31 we have Chloé Rouyer in the Statistics and Machine Learning Thematic Seminar. There is also a change in topic. Chloé Rouyer (University of Kopenhagen, https://sites.google.com/view/chloerouyer/home) Thursday august 31, 16:00-17:00 In person, at the University of Amsterdam Location: Science park 904 A1.24 Title: A near-optimal best-of-both-worlds algorithm for online learning with feedback graphs Abstract: In this work, we consider an online learning problem that interpolates between bandits and full information problems: extra observations are granted depending on the action played and the position of that action in a feedback graph, which is known to the learner. While this problem has been widely studied against both adversarial and stochastic environments separately, aiming to obtain best-of-both-worlds guarantees is a challenging problem that has only been studied recently. We propose an algorithm that achieves near-optimal guarantees in both the adversarial and the stochastic regimes simultaneously. Our results are also computationally efficient and can naturally adapt to sequences of feedback graphs that change over time. Seminar organizers: Tim van Erven Botond Szabo https://mschauer.github.io/StructuresSeminar/

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Stats and ML thematic seminar: Chloe Rouyer
by Dirk van der Hoeven 25 Aug '23

25 Aug '23

Dear all, On Thursday august 31 we have Chloé Rouyer in the Statistics and Machine Learning Thematic Seminar. Chloé Rouyer (University of Kopenhagen, https://sites.google.com/view/chloerouyer/home) Thursday august 31, 16:00-17:00 In person, at the University of Amsterdam Location: TBA Title: No-Regret Online Reinforcement Learning with Adversarial Losses and Transitions Abstract: We consider a simple reinforcement learning framework known as episodic Markov Decision Processes, which is a repeated game where a learner has to navigate an environment and learn the underlying transitions and reward functions with the goal of maximizing its cumulative reward. We investigate the effect of corruption on both the transition and the reward functions. Specifically, it has been shown that corrupting the transitions is more detrimental for the learner than corrupting the rewards as a linear amount of corruption on the transitions can lead to linear regret, whereas it is still possible to achieve sublinear regret even with a linear amount of corruption on the rewards (also known as the adversarial regime). In this work, our goal is to adapt to detangle both notions of corruptions and to propose methods that optimally adapt to each corruption measure. Seminar organizers: Tim van Erven Botond Szabo https://mschauer.github.io/StructuresSeminar/

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[CFP] NeurIPS workshop on Causal Representation learning - deadline extended to Oct 2
by Sara Magliacane 16 Aug '23

16 Aug '23

We warmly invite you to submit a paper and participate in our Causal Representation Learning workshop (https://crl-workshop.github.io/) that will be held *December 15, 2023* at NeurIPS 2023, New Orleans, USA. Causal Representation Learning is an exciting intersection of machine learning and causality that aims at learning low-dimensional, high-level causal variables along with their causal relations directly from raw, unstructured data, e.g. images. Our submission deadline has been extended to *October 2, 2023, 23:59 AoE* and the submission link is https://openreview.net/group?id=NeurIPS.cc/2023/Workshop/CRL. More information below. ***MOTIVATION AND TOPICS*** Current machine learning systems have rapidly increased in performance by leveraging ever-larger models and datasets. Despite astonishing abilities and impressive demos, these models fundamentally *only learn from statistical **correlations* and struggle at tasks such as *domain generalisation, adversarial examples, or planning*, which require higher-order cognition. This sole reliance on capturing correlations sits at the core of current debates about making AI systems "truly'' understand. One promising and so far underexplored approach for obtaining visual systems that can go *beyond correlations* is integrating ideas from causality into representation learning. Causal inference aims to reason about the effect of interventions or external manipulations on a system, as well as about hypothetical counterfactual scenarios. Similar to classic approaches to AI, it typically assumes that the causal variables of interest are given from the outset. However, real-world data often comprises high-dimensional, low-level observations (e.g., RGB pixels in a video) and is thus usually not structured into such meaningful causal units. To this end, the emerging field of causal representation learning (CRL) combines the strengths of ML and causality. In CRL we aim at learning low-dimensional, high-level causal variables along with their causal relations directly from raw, unstructured data, leading to representations that support notions such as causal factors, interventions, reasoning, and planning. In this sense, CRL aligns with the general goal of modern ML to learn meaningful representations of data that are more robust, explainable, and performant, and in our workshop we want to catalyze research in this direction. This workshop brings together researchers from the emerging CRL community, as well as from the more classical causality and representation learning communities, who are interested in learning causal, robust, interpretable and transferrable representations. Our goal is to foster discussion and cross-fertilization between causality, representation learning and other fields, as well as to engage the community in identifying application domains for this emerging new field. In order to encourage discussions, we will welcome submissions related to any aspect of CRL, including but not limited to: - Causal representation learning, including self-supervised, multi-modal or multi-environment CRL, either in time series or in an atemporal setting, observational or interventional, - Causality-inspired representation learning, including learning representations that are only *approximately* causal, but still useful in terms of generalization or transfer learning, - Abstractions of causal models or in general multi-level causal systems, - Connecting CRL with system identification, learning differential equations from data or sequences of images, or in general connections to dynamical systems, - Theoretical works on identifiability in representation learning broadly, - Real-world applications of CRL, e.g. in biology, healthcare, (medical) imaging or robotics; including new benchmarks or datasets, or addressing the gap from theory to practice. ***IMPORTANT DATES*** Paper submission deadline: September 29 *October 2, 2023 23:59 AoE * Notification to authors: October 27, 2023, 23:59 AoE Camera-ready version and videos: December 1, 2023, 23:59 AoE Workshop Date: December 15 or 16, 2023 at NeurIPS ***SUBMISSION INSTRUCTIONS*** As for all NeurIPS workshops, submissions should contain original and previously unpublished research and they should be formatted using the NeurIPS latex style. Papers should be submitted as a PDF file and should be maximum 6 pages in length, including all main results, figures, and tables. Appendices containing additional details are allowed, but reviewers are not expected to take this into account. The workshop will not have proceedings (or in other words, it will not be archival), which means you can submit the same or extended work as a publication to other venues after the workshop. This means we also accept (shortened versions of) submissions to other venues, as long as they are not published before the workshop date in December. Submission site: https://openreview.net/group?id=NeurIPS.cc/2023/Workshop/ CRL ***ORGANIZERS*** Sara Magliacane, University of Amsterdam and MIT-IBM Watson AI Lab Atalanti Mastakouri, Amazon Yuki Asano, University of Amsterdam and Qualcomm Research Claudia Shi, Columbia University and FAR AI Cian Eastwood, University of Edinburgh and Max Planck Institute Tübingen Sébastien Lachapelle, Mila and Samsung’s SAIT AI Lab (SAIL) Bernhard Schölkopf, Max Planck Institute Tübingen Caroline Uhler, MIT and Broad Institute

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Machine-learning-nederland August 2023