ShapeletSupervised Troubleshooting - Teradata Vantage

Machine Learning Engine Analytic Function Reference

Product
Teradata Vantage
Release Number
8.00
1.0
Published
May 2019
Language
English (United States)
Last Update
2019-11-22
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blj1506016597986.ditamap
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dita:id
B700-4003
lifecycle
previous
Product Category
Teradata Vantageā„¢

Problem: The function runs slowly for large input data sets.

For a large input data set, the function runs slowly, spending much time on one step, or it terminates with a failure message. Consult the logs for error messages and troubleshooting information.

Workarounds:

  • Improve the execution time of the saxification step, in any of the following ways:
    • Decrease the difference between the SaxMinWindowSize and SaxMaxWindowSize argument values.
    • Increase the SaxOutputFrequency argument value.
    • Decrease the SaxSymbolsPerWindow argument value.
  • Decrease the number of masking operations by decreasing the RandomProjections argument value.
  • Decrease the number of shapelets in the output table by decreasing the ShapeletCount argument value.
  • Increase the number of data points to skip between consecutive time series windows when calculating the distance of a shapelet from a time series by increasing the TimeInterval argument value.

Problem: Classification accuracy is not good enough.

The function completes successfully, but the classification accuracy is low.

Workarounds:

  • Improve the accuracy of the saxification step, in any of the following ways:
    • Increase the difference between the SaxMinWindowSize and SaxMaxWindowSize argument values.
    • Decrease the SaxOutputFrequency argument value.
    • Increase the SaxSymbolsPerWindow argument value.
  • Increase the number of masking operations by increasing the RandomProjections argument value.
  • Increase the number of shapelets in the output table by increasing the ShapeletCount argument value.
  • Decrease the number of data points to skip between consecutive time series windows when calculating the distance of a shapelet from a time series by decreasing the TimeInterval argument value.