1.1 - 8.10 - ShapeletUnsupervised Syntax Elements - Teradata Vantage

Teradata Vantage™ - Machine Learning Engine Analytic Function Reference

Product
Teradata Vantage
Release Number
1.1
8.10
Release Date
October 2019
Content Type
Programming Reference
Publication ID
B700-4003-079K
Language
English (United States)
OutputTable
[Optional] Specify the name for the table that the function outputs.
Default: output_table in the current schema
TimeColumn
Specify the name of the InputTable column that contains the time series.
TargetColumn
Specify the name of the InputTable column that contains the data point values.
SAXWindowSize
Specify the SAX syntax element WindowSize, which specifies the size of the sliding window. The window_size must be an INTEGER in the range [1, 1000000].
SAXSymbolsPerWindow
[Optional] Specify the SAX syntax element SymbolsPerWindow, which specifies the number of SAX code symbols to create from a window. The symbols_per_window must an INTEGER in the range [1, 1000000]. If symbols_per_window is greater than window_size, the function changes symbols_per_window to window_size.
Default: symbols_per_window is the same as window_size
SAXOutputFrequency
[Optional] Specify the SAX syntax element OutputFrequency, which specifies the number of data points to skip between successive sliding windows. The gap_between_windows must be an integer in the range [1, 1000]. A smaller value increases accuracy (the chance of distinguishing time series from each other) at the cost of higher execution time.
Default: 1
IDColumn
Specify the name of the InputTable column that contains the unique identity of a time series.
RandomProjections
[Optional] Specify the number of iterations required for random masking of SAX words during u_shapelets selection. The projections must be an INTEGER in the range [1, 30]. Specifying a greater projections for a longer input time series increases the probability of identifying better u_shapelets at the cost of higher execution time.
Default: 10
StopThreshold
[Optional] Specify the value at which an iteration stops and the function stops. The iteration i ends when score iscore i-1 is less than threshold. The threshold must be a DOUBLE PRECISION value in the range (0, 1).
Default: 0.5
MaxIterNum
[Optional] Specify the number of iterations at which the function stops. The max_iterations must be an INTEGER in the range [1, 50].
Default: 10
ShapeletCutOff
[Optional] Specify the percentage of u-shapelets to use. The cut_off must be a DOUBLE PRECISION value in the range (0, 1].
Default: 0.1 (10%)