FIX Accept d2_absolute_error_score as named scorer

[ArturoAmorQ]

Reference Issues/PRs

Follow-up from #28750. See also #22118.

What does this implement/fix? Explain your changes.

As mentioned in #28750 (comment), accepting d2_absolute_error_score as a named scorer (a string to be passed to scoring) could be a common enough practice to be worth the shortcut. In fact, such possibility is already documented in model_evaluation.rst L105.

Any other comments?

Snippet for testing:

from sklearn.datasets import load_diabetes
from sklearn.linear_model import LinearRegression
from sklearn.model_selection import cross_val_score

X, y = load_diabetes(return_X_y=True)
model = LinearRegression()
cross_val_score(model, X, y, scoring="d2_absolute_error_score")

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[adrinjalali]

Doesn't this also need to modify the score tables in the user guide?

[ArturoAmorQ]

Doesn't this also need to modify the score tables in the user guide?

It is already documented in the user guide on main.

[OmarManzoor]

LGTM. Thanks @ArturoAmorQ