Add newtype to lift classes to monad transformers #272
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reubenharry
reviewed
May 17, 2023
| random = lift random | ||
| bernoulli = lift . bernoulli | ||
| categorical = lift . categorical | ||
| uniformD = lift . uniformD |
Contributor
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My only note here would be that some of the previous lifting instances appear to have varied slightly. This actually may have been my doing, because I recall that working in a transformed Enumerator didn't lift bernoulli, so that discrete distributions got calculated via random and thus failed with enumerate.
reubenharry
reviewed
May 17, 2023
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| instance (MonadTrans t, MonadDistribution m, Monad (t m)) => MonadDistribution (MonadMeasureTrans t m) where | ||
| random = lift random | ||
| uniform = (lift .) . uniform |
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Similarly here, there may have been a reason that many of the instances were limited to mostly just lift random. This doesn't change the denotational semantics, but may have efficiency implications, so make sure to benchmark, particularly PMMH and RMSMC.
reubenharry
approved these changes
May 17, 2023
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With this PR, it should be possible to derive the
MonadMeasureclass easily for any monad transformer.