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There was a recent update that went out, maybe two or three weeks ago? Anyways, x-validation disappeared from my operators list. How can I get it back?
After the 7.3 update, several previously separate cross-validation operators have been combined into a single operator called "cross validation" which you should be able to find under the validation folder in your operator list. See the attached screenshot.
On the docs site you can find the corresponding changelog article.