truncation_method

Metric that estimates active subspace size

Specification

• Alias: None

• Arguments: None

• Default: constantine

Child Keywords:

Required/Optional	Description of Group	Dakota Keyword	Dakota Keyword Description
Optional		bing_li	Use the Bing Li “ladle” diagnostic to truncate subspace
Optional		constantine	Use the Constantine diagnostic to truncate subspace
Optional		energy	Truncate the subspace based on eigenvalue energy
Optional		cross_validation	Truncate the subspace to minimize surrogate cross-validation error

Description

Metric that controls how many basis vectors are retained in the active subspace.

Default Behavior

The default is to use the constantine diagnostic.

Usage Tips

If the automated subspace identification methods do not yield desirable results, consider using the explicit dimension truncation option.