Increase the stack size, or use a different serialiser (they're only a half dozen lines to write), or different data structure? -- Don frigginfriggins:

I'm playing around with Netflix, implementing a simple KNN-algorithm, I will later try SVD which seems to be the most successful approach.

Using a database like Postgresqk is to slow so I want to serialize a datastructure containing the ratings. I'm not sure about the representation I will use just yet, if I should use multiple arrays or an Map/ IntMap.

However I tried Data.Binary and already for small sizes I get stack overflow when deserializing. The serializing works fine but when bringing it back it overflows. How can I solve this? This is just 2MB, I will eventually need soemthing like 2-500MB to store everything depending on what representatin I choose.

module Serialize where import qualified Data.Binary as B import qualified Data.Binary.Put as P import qualified Data.Map as M import qualified Data.List as L

genTest :: Int -> M.Map (Int,Int) Int genTest n = let movies = take n $ repeat 1 grades = take n $ repeat 4 in M.fromList $ ([1..n] `zip` movies) `zip` grades

main = do let a = genTest 50000 B.encodeFile "C:/users/saftarn/desktop/bintest.txt" a print "Success"

dec = B.decodeFile "C:/users/saftarn/desktop/bintest.txt" >>= \a -> return $ (a :: M.Map (Int,Int) Int)

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