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| author | Justin Bedo <cu@cua0.org> | 2023-01-24 16:41:14 +1100 |
|---|---|---|
| committer | Justin Bedo <cu@cua0.org> | 2023-01-24 16:41:52 +1100 |
| commit | 275ed22d5050488e6d40bb5800f1ade9c30d8a76 (patch) | |
| tree | e4b5522c58074e54653df8f7bc553636577881ca /src/PPL/Internal.hs | |
| parent | 190a4dc5f5398e6646823aa41637f54cc8cb54aa (diff) | |
don't hold onto generators
Diffstat (limited to 'src/PPL/Internal.hs')
| -rw-r--r-- | src/PPL/Internal.hs | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/src/PPL/Internal.hs b/src/PPL/Internal.hs index de48a3f..b7d49ee 100644 --- a/src/PPL/Internal.hs +++ b/src/PPL/Internal.hs @@ -45,12 +45,15 @@ mutateTree :: RandomGen g => Double -> Double -> g -> Tree -> Tree mutateTree p q g (Tree a ts) = let (r, g1) = random g (b, g2) = random g1 - in if r >= p - then Tree a (mutateTrees p q g1 ts) - else - if r < p * q - then Tree (1 - a) (mutateTrees p q g1 ts) - else Tree b (mutateTrees p q g2 ts) + in Tree + ( if r >= p + then a + else + if r < p * q + then 1 - a + else b + ) + (mutateTrees p q g2 ts) where mutateTrees p q g (t : ts) = let (g1, g2) = R.split g |