Language Models iR based on Language Model (Lm) Information …………… need P(2IM) Mdi generation d2 query a common search heuristic is to use Mdn words that you expect to find in matching documents as your query document collection The LM approach directly exploits that ideaLanguage Models 5 IR based on Language Model (LM) query d1 d2 dn … Information need document collection generation ( | ) P Q Md 1 Md M d2 … n M d ▪ A common search heuristic is to use words that you expect to find in matching documents as your query. ▪ The LM approach directly exploits that idea!