With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: U2 made an album.
text_B: IronRuby is an implementation of the Ruby programming language targeting Microsoft .. Microsoft. Microsoft. Ruby programming language. Ruby ( programming language ). NET framework .. It is implemented on top of the Dynamic Language Runtime -LRB- DLR -RRB- , a library running on top of the Common Language Infrastructure that provides dynamic typing and dynamic method dispatch , among other things , for dynamic languages .. Dynamic Language Runtime. Dynamic Language Runtime. Common Language Infrastructure. Common Language Infrastructure. The project is currently inactive , with the last release of IronRuby -LRB- version 1.1.3 -RRB- being in March 2011 .
not_related.