Dictionaries and Tolerant Retrieval

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Introduction to Information RetrievalSec. 3.3.5Context‐sensitive t correction• Need surrounding context to catch this.• First idea: retrieve dictionary terms close (inweighted edit distance) to each query term• Now try all possible resulting phrases with one word“fixed” at a time• flew from heathrow• fled form heathrow• flea form heathrow• Hit‐based spelling correction: Suggest thealternative that has lots of hits.36
Introduction to Information RetrievalSec. 3.3.5Exercise• Suppose that for “flew form Heathrow” we have 7alternatives for flew, 19 for form and 3 for heathrow.How many “corrected” phrases will we enumerate inthis scheme?37
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Dictionaries and Tolerant Retrieval

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