With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Chris O'Dowd starred in a documentary-style television drama.
text_B: Constraint in information theory refers to the degree of statistical dependence between or among variables .. information theory. information theory. Garner provides a thorough discussion of various forms of constraint -LRB- internal constraint , external constraint , total constraint -RRB- with application to pattern recognition and psychology .. pattern recognition. pattern recognition. psychology. psychology
not_related.