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Roll diffCostOfMaybes into constantTimeEditDistance.

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This commit is contained in:
Rob Rix 2016-08-18 12:50:03 -04:00
parent e063d7e0cd
commit ddbcb0cd18
1 changed files with 1 additions and 4 deletions
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src/Data/RandomWalkSimilarity.hs
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@ -77,10 +77,7 @@ rws compare as bs
-- | Computes a constant-time approximation to the edit distance of a diff. This is done by comparing at most _m_ nodes, & assuming the rest are zero-cost.
constantTimeEditDistance :: (Prologue.Foldable f, Functor f) => Comparator f a -> Integer -> Cofree f a -> Cofree f a -> Int
constantTimeEditDistance compare m a b = fromMaybe maxBound $ diffCostOfMaybes . cutoff m <$> compare a b
diffCostOfMaybes :: (Prologue.Foldable f, Functor f) => Free (CofreeF f (Both annotation)) (Maybe (Patch (Cofree f annotation))) -> Int
diffCostOfMaybes = diffSum $ patchSum termSize
constantTimeEditDistance compare m a b = fromMaybe maxBound $ diffSum (patchSum termSize) . cutoff m <$> compare a b
where diffSum patchCost diff = sum $ fmap (maybe 0 patchCost) diff
-- | A term which has not yet been mapped by `rws`, along with its feature vector summary & index.