lace.Engine.feature_params

Engine.feature_params(col: int | str, state_ixs: List[int] | None = None) → Dict

Get the component parameters for a given column.

Parameters:

• col (int or str) – The index or name of the column from which to retrieve parameters

• state_ixs (List[int], optional) – And optional list of state indices from which to return parameters

Returns:

params – params[state_ix][component_ix] is the component parameters for the given component in the given state

Return type:

Dict[List]

Examples

Get Gaussian component parameters from the Satellites dataset

>>> from lace.examples import Satellites
>>> sats = Satellites()
>>> gauss_params = sats.feature_params("Period_minutes")
>>> g = gauss_params[1][0]
>>> g
Gaussian(mu=2216.995855497483, sigma=2809.7999447423026)
>>> g.mu
2216.995855497483

Get categorical weights from the Satellites dataset

>>> cat_params = sats.feature_params("Class_of_Orbit", state_ixs=[2])
>>> c = cat_params[2][0]
>>> c
Categorical_4(weights=[0.23464953242044007, ..., 0.04544555912284563])
>>> c.weights  
[0.23464953242044007, ..., 0.04544555912284563]

You can also select columns by integer index

>>> sats.columns[3]
'Class_of_Orbit'
>>> params = sats.feature_params(3)
>>> params[0][1]
Categorical_4(weights=[0.0010264756471345055, ..., 0.9963828657821786])