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RE: [Caml-list] Turning off type-checking
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Date: | 2002-05-15 (19:42) |
From: | John Max Skaller <skaller@o...> |
Subject: | Re: [Caml-list] Turning off type-checking |
Markus Mottl wrote: > >--------------------------------------------------------------------------- >let model meal_d1 = > let satisfaction_c1 = > (match meal_d1 with > | TapirSoup spiced_d1 -> > (match spiced_d1 with > | True -> Low > | False -> High) > | Pizza (_, spiced_d1, topping_d1) -> > let satisfaction_c1 = > (match spiced_d1 with > | True -> > (match topping_d1 with > | Cheese sort_d1 -> > (match sort_d1 with > | Gorgonzola -> Low > | Mozzarella -> High) > | _ -> High) > | False -> Low) in > Very satisfaction_c1 > | WienerSchnitzel _ -> Low) in > Very satisfaction_c1 >--------------------------------------------------------------------------- > >If there are, say, mappings from 100 to 100 variables and thousands of >deeply structured sample values (a "real-world" problem), the models >can look quite terrifying. > Hmm. The standard programmers trick here is to lift out the nested components, at the cost of passing the environment as arguments: if you type the arguments, it short circuits inference. BTW: you can encode the "Very" recursion as an integer. For some models .. eg the model is a grammar and the data is a program with output a parse tree .. this optimisation isn't useful .. but in the 'real' world a lot of data is scalar rather than recursive. -- John Max Skaller, mailto:skaller@ozemail.com.au snail:10/1 Toxteth Rd, Glebe, NSW 2037, Australia. voice:61-2-9660-0850 ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners