optional

skrub.optional(value, *, name=None)

Construct a choice between a value and None.

This is useful for optional steps in a pipeline. If we want to try our pipeline with or without dimensionality reduction, we can add a step such as:

>>> from sklearn.decomposition import PCA
>>> from skrub import optional
>>> optional(PCA(), name='use dim reduction')
optional(PCA(), name='use dim reduction')

The constructed parameter grid will include a version of the pipeline with the PCA and one without.