Search Results for author: Martin Ritzert

Found 13 papers, 5 papers with code

Boosting, Voting Classifiers and Randomized Sample Compression Schemes

no code implementations5 Feb 2024 Arthur da Cunha, Kasper Green Larsen, Martin Ritzert

At the center of this paradigm lies the concept of building the strong learner as a voting classifier, which outputs a weighted majority vote of the weak learners.

Where Did the Gap Go? Reassessing the Long-Range Graph Benchmark

1 code implementation1 Sep 2023 Jan Tönshoff, Martin Ritzert, Eran Rosenbluth, Martin Grohe

The recent Long-Range Graph Benchmark (LRGB, Dwivedi et al. 2022) introduced a set of graph learning tasks strongly dependent on long-range interaction between vertices.

 Ranked #1 on Link Prediction on PCQM-Contact (MRR-ext-filtered metric)

Graph Classification Graph Learning +4

AdaBoost is not an Optimal Weak to Strong Learner

no code implementations27 Jan 2023 Mikael Møller Høgsgaard, Kasper Green Larsen, Martin Ritzert

AdaBoost is a classic boosting algorithm for combining multiple inaccurate classifiers produced by a weak learner, to produce a strong learner with arbitrarily high accuracy when given enough training data.

Optimal Weak to Strong Learning

no code implementations3 Jun 2022 Kasper Green Larsen, Martin Ritzert

The classic algorithm AdaBoost allows to convert a weak learner, that is an algorithm that produces a hypothesis which is slightly better than chance, into a strong learner, achieving arbitrarily high accuracy when given enough training data.

Generalization Bounds

Graph Machine Learning for Design of High-Octane Fuels

no code implementations1 Jun 2022 Jan G. Rittig, Martin Ritzert, Artur M. Schweidtmann, Stefanie Winkler, Jana M. Weber, Philipp Morsch, K. Alexander Heufer, Martin Grohe, Alexander Mitsos, Manuel Dahmen

We propose a modular graph-ML CAMD framework that integrates generative graph-ML models with graph neural networks and optimization, enabling the design of molecules with desired ignition properties in a continuous molecular space.

Bayesian Optimization BIG-bench Machine Learning +1

On the Parameterized Complexity of Learning First-Order Logic

no code implementations24 Feb 2021 Steffen van Bergerem, Martin Grohe, Martin Ritzert

We analyse the complexity of learning first-order queries in a model-theoretic framework for supervised learning introduced by (Grohe and Tur\'an, TOCS 2004).

Logic in Computer Science

Walking Out of the Weisfeiler Leman Hierarchy: Graph Learning Beyond Message Passing

1 code implementation17 Feb 2021 Jan Tönshoff, Martin Ritzert, Hinrikus Wolf, Martin Grohe

As the theoretical basis for our approach, we prove a theorem stating that the expressiveness of CRaWl is incomparable with that of the Weisfeiler Leman algorithm and hence with graph neural networks.

Graph Classification Graph Learning +2

The Effects of Randomness on the Stability of Node Embeddings

2 code implementations20 May 2020 Tobias Schumacher, Hinrikus Wolf, Martin Ritzert, Florian Lemmerich, Jan Bachmann, Florian Frantzen, Max Klabunde, Martin Grohe, Markus Strohmaier

We systematically evaluate the (in-)stability of state-of-the-art node embedding algorithms due to randomness, i. e., the random variation of their outcomes given identical algorithms and graphs.

General Classification Node Classification

Learning definable hypotheses on trees

no code implementations24 Sep 2019 Emilie Grienenberger, Martin Ritzert

We study the problem of learning properties of nodes in tree structures.

Graph Neural Networks for Maximum Constraint Satisfaction

1 code implementation18 Sep 2019 Jan Toenshoff, Martin Ritzert, Hinrikus Wolf, Martin Grohe

Many combinatorial optimization problems can be phrased in the language of constraint satisfaction problems.

Combinatorial Optimization

Learning MSO-definable hypotheses on string

no code implementations27 Aug 2017 Martin Grohe, Christof Löding, Martin Ritzert

We study the classification problems over string data for hypotheses specified by formulas of monadic second-order logic MSO.

General Classification

Learning first-order definable concepts over structures of small degree

no code implementations19 Jan 2017 Martin Grohe, Martin Ritzert

We consider a declarative framework for machine learning where concepts and hypotheses are defined by formulas of a logic over some background structure.

BIG-bench Machine Learning

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