With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Inspectah Deck is the singer of Czarface.
text_B: The Mixed synchronized 3 metre springboard competition of the diving events at the 2015 World Aquatics Championships was held on 2 August 2015 .. diving. Diving at the 2015 World Aquatics Championships. 2015 World Aquatics Championships. 2015 World Aquatics Championships
not_related.