Dakota Reference Manual: truncation_method

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truncation_method

Metric that estimates active subspace size

## Specification

Alias: none

Argument(s): 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.