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Time Series Indexing

Time Series Indexing

By : Mihalis Tsoukalos
5 (3)
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Time Series Indexing

Time Series Indexing

5 (3)
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)
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Using the Python code

In this section, we are going to use the Python scripts that we have created.

Running apprMPdist.py using the two time series with 10,000 elements each that we created earlier in this chapter generates the following kind of output:

$ ./apprMPdist.py 10k1.gz 10k2.gz -s 3 -c 64 -t 500 -w 120
Max Cardinality: 64 Segments: 3 Sliding Window: 120 Threshold: 500 Default Promotion: False
MPdist: 351.27 seconds
Approximate MPdist: 12.603

Using a bigger sliding window size generates the following output:

$ ./apprMPdist.py 10k1.gz 10k2.gz -s 3 -c 64 -t 500 -w 300
Max Cardinality: 64 Segments: 3 Sliding Window: 300 Threshold: 500 Default Promotion: False
MPdist: 384.74 seconds
Approximate MPdist: 21.757

So, bigger sliding window sizes require more time. As before, this is because calculating Euclidean distances for bigger sliding window sizes is slower.

Executing joinMPdist.py produces the following output:

$ ./joinMPdist.py 10k1.gz 10k2.gz -s 3 -c 64...
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Time Series Indexing
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