Marie Anastacio

Leiden University | LEI · Leiden Institute of Advanced Computer Science

In recent years, general-purpose automated algorithm configuration procedures have enabled impressive improvements in the state of the art in solving a wide range of challenging problems from AI, operations research and other areas. To search vast combinatorial spaces of parameter settings for a given algorithm as efficiently as possible, the most...

Automated machine learning (AutoML) systems commonly ensemble models post hoc to improve predictive performance, typically via greedy ensemble selection (GES). However, we believe that GES may not always be optimal, as it performs a simple deterministic greedy search. In this work, we introduce two novel population-based ensemble selection methods,...

We present an extensive study of methods for exactly solving stochastic constraint (optimisation) problems (SCPs) in network analysis. These problems are prevalent in science, governance and industry. The first method we study is generic and decomposes stochastic constraints into a multitude of smaller local constraints that are solved using a cons...

The performance of state-of-the-art algorithms is highly dependent on their parameter values, and choosing the right configuration can make the difference between solving a problem in a few minutes or hours. Automated algorithm configurators have shown their efficiency on a wide range of applications. However, they still encounter limitations when...

A processing chain must be the result of a discovery process that requires constant back and forth between theoretical description of the solution, software implementation, testing and refinement of the theoretical description in the light of the results of experimentation. This process is iterative. Some projects based on this philosophy have seen...

In this paper, we present a flexible, modular, consistent, and coherent approach for language and text processing engineering. Each processing chain dedicated to text processing is regarded as a serial or parallel assembly of modules, underlying particular tasks a user wants to apply to a text. Users, according to their needs and perspectives might...

In informational terms, a module dedicated to process information always has specific inputs and outputs. It describes a particular process constrained by specific rules. A processing chain can be a serial combination and/or a parallel combination of such modules. Thus, in an architecture of language engineering, each processing chain becomes a par...