A Dictionary-Based Approach to Time Series Ordinal Classification

Áreas de investigación:

• Sin categoría

Año:

2023

Tipo de publicación:

Artículo en conferencia

Palabras clave:

Time Series, Dictionary-Based Approaches, Ordinal Classification

Autores:

• Ayllón-Gavilán, Rafael
• Guijo-Rubio, David
• Gutiérrez, Pedro Antonio
• Hervás-Martínez, César

Volumen:

14135

Título del libro:

IWANN 2023: Advances in Computational Intelligence

Serie:

Lecture Notes in Computer Science (LNCS)

Páginas:

541-552

Organización:

Ponta Delgada, Portugal

Mes:

19th-21th June, 2023

Abstract:

Time Series Classification (TSC) is an extensively researched field from which a broad range of real-world problems can be addressed obtaining excellent results. One sort of the approaches performing well are the so-called dictionary-based techniques. The Temporal Dictionary Ensemble (TDE) is the current state-of-the-art dictionary-based TSC approach. In many TSC problems we find a natural ordering in the labels associated with the time series. This characteristic is referred to as ordinality, and can be exploited to improve the methods performance. The area dealing with ordinal time series is the Time Series Ordinal Classification (TSOC) field, which is yet unexplored. In this work, we present an ordinal adaptation of the TDE algorithm, known as ordinal TDE (O-TDE). For this, a comprehensive comparison using a set of 18 TSOC problems is performed. Experiments conducted show the improvement achieved by the ordinal dictionary-based approach in comparison to four other existing nominal dictionary-based techniques.