Search Results for author: Pekka Parviainen

Found 9 papers, 4 papers with code

Structural perspective on constraint-based learning of Markov networks

no code implementations13 Mar 2024 Tuukka Korhonen, Fedor V. Fomin, Pekka Parviainen

When it comes to the number of tests, our upper bound on the sizes of conditioning sets implies that every $n$-vertex graph can be learned by at most $n^{\kappa}$ tests with conditioning sets of sizes at most $\kappa$.

Inspecting class hierarchies in classification-based metric learning models

1 code implementation26 Jan 2023 Hyeongji Kim, Pekka Parviainen, Terje Berge, Ketil Malde

In addition to the standard classification accuracy, we evaluate the hierarchical inference performance by inspecting learned class representatives and the hierarchy-informed performance, i. e., the classification performance, and the metric learning performance by considering predefined hierarchical structures.

Classification Metric Learning

Realistic mask generation for matter-wave lithography via machine learning

no code implementations15 Jul 2022 Johannes Fiedler, Adrià Salvador Palau, Eivind Kristen Osestad, Pekka Parviainen, Bodil Holst

This approximation is then used to generate the initial population of the genetic optimisation algorithm that can converge to arbitrary precision.

BIG-bench Machine Learning

Distance-Ratio-Based Formulation for Metric Learning

1 code implementation21 Jan 2022 Hyeongji Kim, Pekka Parviainen, Ketil Malde

We propose a distance-ratio-based (DR) formulation for metric learning.

Metric Learning

Learning Large DAGs by Combining Continuous Optimization and Feedback Arc Set Heuristics

no code implementations1 Jul 2021 Pierre Gillot, Pekka Parviainen

Bayesian networks represent relations between variables using a directed acyclic graph (DAG).

Measuring Adversarial Robustness using a Voronoi-Epsilon Adversary

1 code implementation6 May 2020 Hyeongji Kim, Pekka Parviainen, Ketil Malde

As a result, adversarial accuracy based on this adversary avoids a tradeoff between accuracy and adversarial accuracy on training data even when $\epsilon$ is large.

Adversarial Robustness

Distributed Bayesian Matrix Factorization with Limited Communication

no code implementations2 Mar 2017 Xiangju Qin, Paul Blomstedt, Eemeli Leppäaho, Pekka Parviainen, Samuel Kaski

Bayesian matrix factorization (BMF) is a powerful tool for producing low-rank representations of matrices and for predicting missing values and providing confidence intervals.

Learning Structures of Bayesian Networks for Variable Groups

no code implementations31 Aug 2015 Pekka Parviainen, Samuel Kaski

We show that for dependency structures between groups to be expressible exactly, the data have to satisfy the so-called groupwise faithfulness assumption.

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