Blurb::
Metric that estimates active subspace size
Description::
Metric that controls how many basis vectors are retained in the active
subspace.

*Default Behavior*

The default is to use the
:dakkw:`model-active_subspace-truncation_method-constantine` diagnostic.

*Usage Tips*

If the automated subspace identification methods do not yield desirable results,
consider using the explicit :dakkw:`model-active_subspace-dimension` truncation option.
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