private void CheckLabelType(RoleMappedData data, out int labelCardinality)
{
_host.Assert(data.Schema.Label.HasValue);
if (data.Schema.Label.Value.Type == BooleanDataViewType.Instance)
{
labelCardinality = 2;
}
else
{
TrainerUtils.CheckMulticlassLabel(data, out labelCardinality);
_host.CheckUserArg(labelCardinality > 1, nameof(_labelColumnName), "Label column type must have known cardinality more than 1");
}
}