Warning used to notify the user of inefficient computation.
This warning notifies the user that the efficiency may not be optimal due to some reason which may be included as a part of the warning message. This may be subclassed into a more specific Warning class.
Added in version 0.18.
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Licensed under the 3-clause BSD License.
https://scikit-learn.org/1.6/modules/generated/sklearn.exceptions.EfficiencyWarning.html