fix label 'contradiction' dropped bug

[dhrim]

trafficstars

in function process_input_data() label "contradiction" was missed when filtering "entailment" or "contradiction". So all data was only of label "entailment"

I just added "contradition".

[ted-at-openai]

I don't think this is a bug - the point of the section is to show how you can start with only positives and then generate synthetic negatives.

[dhrim]

got it