[7.6][ML] Validate classification dependent_variable cardinality is a… #51310
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…t lea… (elastic#51232) Data frame analytics classification currently only supports 2 classes for the dependent variable. We were checking that the field's cardinality is not higher than 2 but we should also check it is not less than that as otherwise the process fails. Backport of elastic#51232
dimitris-athanasiou
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…t lea… (#51232)
Data frame analytics classification currently only supports 2 classes for the
dependent variable. We were checking that the field's cardinality is not higher
than 2 but we should also check it is not less than that as otherwise the process
fails.
Backport of #51232