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General issues in spell correction
We enumerate multiple alternatives for “Did you mean?”
Need to figure out which to present to the user
The alternative hitting most docs
Query log analysis
More generally, rank alternatives probabilistically
argmaxcorr P(corr | query)
From Bayes rule, this is equivalent to
argmaxcorr P(query | corr) * P(corr)↑ ↑
Noisy channel Language model
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