With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mariah Carey entered into a contractual relationship with an American record company.
text_B: Spike-and-slab regression is a Bayesian variable selection technique that is particularly useful when the number of possible predictors is larger than the number of observations .. variable selection. Feature selection. Initially , the idea of the spike-and-slab model was proposed by Mitchell & Beauchamp -LRB- 1988 -RRB- .. The approach was further significantly developed by Madigan & Raftery -LRB- 1994 -RRB- and George & McCulloch -LRB- 1997 -RRB- .. The final adjustments to the model were done by Ishwaran & Rao -LRB- 2005 -RRB- .
not_related.