Search Results for author: Arto Klami

Found 20 papers, 8 papers with code

Learning to Lemmatize in the Word Representation Space

no code implementations NoDaLiDa 2021 Jarkko Lagus, Arto Klami

We propose an alternative for this, in form of a tool that performs lemmatization in the space of word embeddings.

Lemmatization Word Embeddings

Warped geometric information on the optimisation of Euclidean functions

no code implementations16 Aug 2023 Marcelo Hartmann, Bernardo Williams, Hanlin Yu, Mark Girolami, Alessandro Barp, Arto Klami

We use Riemannian geometry notions to redefine the optimisation problem of a function on the Euclidean space to a Riemannian manifold with a warped metric, and then find the function's optimum along this manifold.

Scalable Stochastic Gradient Riemannian Langevin Dynamics in Non-Diagonal Metrics

1 code implementation9 Mar 2023 Hanlin Yu, Marcelo Hartmann, Bernardo Williams, Arto Klami

Stochastic-gradient sampling methods are often used to perform Bayesian inference on neural networks.

Bayesian Inference

Estimating the Contamination Factor's Distribution in Unsupervised Anomaly Detection

3 code implementations19 Oct 2022 Lorenzo Perini, Paul Buerkner, Arto Klami

We leverage on outputs of several anomaly detectors as a representation that already captures the basic notion of anomalousness and estimate the contamination using a specific mixture formulation.

Unsupervised Anomaly Detection

Neural network for determining an asteroid mineral composition from reflectance spectra

no code implementations3 Oct 2022 David Korda, Antti Penttilä, Arto Klami, Tomáš Kohout

We aim to develop a fast and robust neural-network-based method for deriving the mineral modal and chemical compositions of silicate materials from their visible and near-infrared spectra.

Vocal Bursts Type Prediction

Lagrangian Manifold Monte Carlo on Monge Patches

1 code implementation1 Feb 2022 Marcelo Hartmann, Mark Girolami, Arto Klami

The efficiency of Markov Chain Monte Carlo (MCMC) depends on how the underlying geometry of the problem is taken into account.

Efficient Exploration

Traversing Time with Multi-Resolution Gaussian Process State-Space Models

no code implementations6 Dec 2021 Krista Longi, Jakob Lindinger, Olaf Duennbier, Melih Kandemir, Arto Klami, Barbara Rakitsch

These models have a natural interpretation as discretized stochastic differential equations, but inference for long sequences with fast and slow transitions is difficult.

Reliable Categorical Variational Inference with Mixture of Discrete Normalizing Flows

1 code implementation28 Jun 2020 Tomasz Kuśmierczyk, Arto Klami

Variational approximations are increasingly based on gradient-based optimization of expectations estimated by sampling.

valid Variational Inference

Multi-scale Cloud Detection in Remote Sensing Images using a Dual Convolutional Neural Network

no code implementations1 Jun 2020 Markku Luotamo, Sari Metsämäki, Arto Klami

Semantic segmentation by convolutional neural networks (CNN) has advanced the state of the art in pixel-level classification of remote sensing images.

Cloud Detection Segmentation +1

Low-Rank Approximations of Second-Order Document Representations

no code implementations CONLL 2019 Jarkko Lagus, Janne Sinkkonen, Arto Klami

Document embeddings, created with methods ranging from simple heuristics to statistical and deep models, are widely applicable.

Sentence

Prior Specification for Bayesian Matrix Factorization via Prior Predictive Matching

2 code implementations27 Oct 2019 Eliezer de Souza da Silva, Tomasz Kuśmierczyk, Marcelo Hartmann, Arto Klami

The behavior of many Bayesian models used in machine learning critically depends on the choice of prior distributions, controlled by some hyperparameters that are typically selected by Bayesian optimization or cross-validation.

Bayesian Optimization Hyperparameter Optimization +1

Correcting Predictions for Approximate Bayesian Inference

1 code implementation11 Sep 2019 Tomasz Kuśmierczyk, Joseph Sakaya, Arto Klami

Bayesian models quantify uncertainty and facilitate optimal decision-making in downstream applications.

Bayesian Inference Decision Making

Variational Bayesian Decision-making for Continuous Utilities

1 code implementation NeurIPS 2019 Tomasz Kuśmierczyk, Joseph Sakaya, Arto Klami

Bayesian decision theory outlines a rigorous framework for making optimal decisions based on maximizing expected utility over a model posterior.

Decision Making Variational Inference

Importance Sampled Stochastic Optimization for Variational Inference

no code implementations19 Apr 2017 Joseph Sakaya, Arto Klami

Variational inference approximates the posterior distribution of a probabilistic model with a parameterized density by maximizing a lower bound for the model evidence.

Probabilistic Programming Stochastic Optimization +1

Group Factor Analysis

no code implementations21 Nov 2014 Arto Klami, Seppo Virtanen, Eemeli Leppäaho, Samuel Kaski

Factor analysis provides linear factors that describe relationships between individual variables of a data set.

Variational Inference

PinView: Implicit Feedback in Content-Based Image Retrieval

no code implementations2 Oct 2014 Zakria Hussain, Arto Klami, Jussi Kujala, Alex P. Leung, Kitsuchart Pasupa, Peter Auer, Samuel Kaski, Jorma Laaksonen, John Shawe-Taylor

It then retrieves images with a specialized online learning algorithm that balances the tradeoff between exploring new images and exploiting the already inferred interests of the user.

Content-Based Image Retrieval Retrieval

Group-sparse Embeddings in Collective Matrix Factorization

no code implementations20 Dec 2013 Arto Klami, Guillaume Bouchard, Abhishek Tripathi

CMF is a technique for simultaneously learning low-rank representations based on a collection of matrices with shared entities.

MULTI-VIEW LEARNING Recommendation Systems

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