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What is a difference between cross-lingual IR and multi-lingual IR?
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Problem
In papers usually Cross-Lingual Information Retrieval (CLIR) and Multi-Lingual Information Retrieval (MLIR) use equivalently or distinctly. I want to know is there any difference between these two terms?
Solution
In this paper they differentiate between these two terms as follows:
While CLIR is concerned with retrieval for given language pairs (i.e.
all the documents are given in a specific language and need to be
retrieved to queries in another language), MLIR is concerned with
retrieval from a document collection where documents in multiple
languages co-exist and need to be retrieved to a query in any
language. MLIR is thus inherently more difficult than CLIR.
While CLIR is concerned with retrieval for given language pairs (i.e.
all the documents are given in a specific language and need to be
retrieved to queries in another language), MLIR is concerned with
retrieval from a document collection where documents in multiple
languages co-exist and need to be retrieved to a query in any
language. MLIR is thus inherently more difficult than CLIR.
Context
StackExchange Computer Science Q#65200, answer score: 4
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