Hi,

in the tutorial under the paragraph semi-supervised learning. is in the command an unlabed.arff.

I wonder how in the arff such a line looks. The only thing I found are "?" as attribute values.

For example:
@relation unlabeded
@Attribute X1 NUMERIC
@Attribute X2 NUMERIC
@Attribute y0 {0, 1}
@Attribute y1 {0, 1}

{ 0 42.42, 1 42.42, 2 ?, 3 ? }

Is the above described unlabed? or what does such a dataset look like?