Rewrite Bellman-Ford and min-cost flow, especially to stop the latter from crashing.

[match/match.git] / program / Test.hs

module Test (
	-- Export everything we need to have fun in GHCi:
	
	-- See the results of examples.
	module Test,
	
	-- Generate instances.
	module Instance,
	module InstanceGenerator,
	
	-- Solve instances.
	module ProposalMatcher,
	module ProposalMatcherConfig,
	
	-- Run randomized things.
	module System.Random,
	module RandomizedMonad,
	
	-- Visualize graphs.
	module Data.Graph.Inductive.Graphviz
) where
import Instance
import InstanceGenerator
import ProposalMatcher
import ProposalMatcherConfig
import System.Random
import RandomizedMonad
import Data.Graph.Inductive.Graphviz

-- Other imports we need
import BellmanFord
import NaiveMinCostFlow
import Data.Array.IArray
import Data.Array.Unboxed
import Data.Graph.Inductive.Graph
import Data.Graph.Inductive.Tree
import ArrayStuff

myGraph = mkGraph [(0, ()), (1, ()), (2, ())]
	[(0, 1, (0, 2)), (0, 2, (1, 3)), (2, 1, (2, -2))] :: Gr () (Int, Int)

bfResult = bellmanFord snd 0 myGraph

flowArray = minCostFlow (0, 2) fst (const 1) snd myGraph (0, 1)

myNCGraph = mkGraph [(0, ())] [(0, 0, -1)] :: Gr () Int
bfNCResult = bellmanFord id 0 myNCGraph

data REdgeF = REdgeF Int Int Int Wt
instance Show REdgeF where
	show (REdgeF idx cap flow cost) = "#" ++ (show idx) ++ ": "
		++ (show flow) ++ " of " ++ (show cap) ++ " @ " ++ (show cost)
flowAnnotate g fa =
	mkGraph (labNodes g) (map (\(n1, n2, REdge i ca co) ->
		(n1, n2, REdgeF i ca (fa ! i) co)) $ labEdges g) :: Gr () REdgeF

-- Example from idea book p. 425
{- 
(myNumRvrs, myNumProps) = (4, 3)

myPrefsArray = array ((0,0), (myNumRvrs-1,myNumProps-1)) [
	((0, 0), 15), ((1, 0), 10), ((2, 0), 15), ((3, 0), 40),
	((0, 1), 30), ((1, 1),  7), ((2, 1), 10), ((3, 1), 15),
	((0, 2), 15), ((1, 2), 25), ((2, 2), 20), ((3, 2), 20)
	]
-}

(myNumRvrs, myNumProps) = (5, 3)

myPrefs = transposeArray $ listArray ((0,0), (myNumProps-1,myNumRvrs-1)) [
	15, 10, 15, 40, 20,
	30,  7, 10, 15, 15,
	15, 25, 20, 20, 15
	] :: UArray (Int, Int) Wt

myInst = Instance myNumRvrs myNumProps (funcArray (0, myNumRvrs-1) $ const 1) myPrefs

rdnResult = doReduction myInst
ReductionResult rrg rrso rrsi rreib rredi = rdnResult
rdnFlowArray = minCostFlow rreib reIdx reCap reCost rrg (rrso, rrsi)
rrg2 = flowAnnotate rrg rdnFlowArray
myMatching = doMatching myInst