With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Fight Club stars Edward Norton.
text_B: Buy the Ticket , Take the Ride  : Hunter S. Thompson on Film is a 2006 documentary about writer Hunter S. Thompson directed by Tom Thurman .. Tom Thurman. Tom Thurman. Hunter S. Thompson. Hunter S. Thompson
not_related.