Book Image

Time Series Indexing

By : Mihalis Tsoukalos
Book Image

Time Series Indexing

By: Mihalis Tsoukalos

Overview of this book

Time series are everywhere, ranging from financial data and system metrics to weather stations and medical records. Being able to access, search, and compare time series data quickly is essential, and this comprehensive guide enables you to do just that by helping you explore SAX representation and the most effective time series index, iSAX. The book begins by teaching you about the implementation of SAX representation in Python as well as the iSAX index, along with the required theory sourced from academic research papers. The chapters are filled with figures and plots to help you follow the presented topics and understand key concepts easily. But what makes this book really great is that it contains the right amount of knowledge about time series indexing using the right amount of theory and practice so that you can work with time series and develop time series indexes successfully. Additionally, the presented code can be easily ported to any other modern programming language, such as Swift, Java, C, C++, Ruby, Kotlin, Go, Rust, and JavaScript. By the end of this book, you'll have learned how to harness the power of iSAX and SAX representation to efficiently index and analyze time series data and will be equipped to develop your own time series indexes and effectively work with time series data.
Table of Contents (11 chapters)

Technical requirements

The GitHub repository with the code can be found at https://github.com/PacktPublishing/Time-Series-Indexing. The code for each chapter is in its own directory. Therefore, the code for this chapter can be found in the ch04 folder and the ch04 subfolders.

The first section takes a quick look at the Python package that we have developed for the purposes of this chapter, which strangely enough is called isax, before going into more detail.

What about bugs?

We have tried our best to give bug-free code. However, bugs might appear in any program, especially when a program is longer than 100 lines! That is why it is crucial to understand the principles behind the operation and construction of an iSAX index and the SAX representation to be able to understand that there might be a small or bigger issue with the code, or be able to port the existing implementation to a different programming language. I wrote the Python version of iSAX using a Java implementation...