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Cusp finding: implement bound consistency improvement
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@ -1636,7 +1636,7 @@ intervalNewtonGSFrom precondMethod minWidth eqs initBox =
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| otherwise
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= ( [ d, u ], ( "s", s_mid ) )
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in recur go ( IntervalNewtonStep ( IntervalNewtonBisection whatBis ) )
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( makeBox1Consistent =<< bisGuesses )
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( doStrategy =<< bisGuesses )
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where
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t_mid = 0.5 * ( t_lo + t_hi )
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s_mid = 0.5 * ( s_lo + s_hi )
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@ -1655,6 +1655,65 @@ intervalNewtonGSFrom precondMethod minWidth eqs initBox =
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!( 𝕀 y'_lo y'_hi ) = negate $ 𝕀 y_lo y_hi
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in 𝕀 ( ℝ2 x'_lo y'_lo ) ( ℝ2 x'_hi y'_hi )
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-- Attempting to implement Algorithm 6 "Heuristic to apply bound-consistency"
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-- from the paper
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-- "Parallelization of a bound-consistency enforcing procedure and its application in solving nonlinear systems"
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doStrategy box@( 𝕀 ( ℝ1 t_lo ) ( ℝ1 t_hi ), _, 𝕀 ( ℝ1 s_lo ) ( ℝ1 s_hi ) )
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| eps_box1 > eps_box2
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= if | w_t > ebs_box1 || w_s > ebs_box1
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-> makeBox1Consistent box
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| w_t > ebs_box2 || w_s > ebs_box2
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-> [ makeBox2Consistent box ]
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| otherwise
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-> [ box ]
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| otherwise
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= if | w_t > ebs_box2 || w_s > ebs_box2
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-> [ makeBox2Consistent box ]
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| w_t > ebs_box1 || w_s > ebs_box1
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-> makeBox1Consistent box
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| otherwise
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-> [ box ]
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where
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eps_box1 = 0.4
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eps_box2 = 0.1
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w_t = t_hi - t_lo
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w_s = s_hi - s_lo
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-- An implementation of "bound-consistency" from the paper
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-- "Parallelization of a bound-consistency enforcing procedure and its application in solving nonlinear systems"
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makeBox2Consistent :: Box -> Box
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makeBox2Consistent x = ( `State.evalState` False ) $ doLoop 0.25 x
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where
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doLoop :: Double -> Box -> State Bool Box
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doLoop lambda x = do
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x' <- boundConsistency get_t set_t lambda x
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x'' <- boundConsistency get_s set_s lambda x'
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modified <- State.get
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let lambda' = if modified then lambda else 0.5 * lambda
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if lambda' < 0.001
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then return x''
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else do { State.put False ; doLoop lambda' x'' }
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boundConsistency :: ( Box -> 𝕀 Double )
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-> ( 𝕀 Double -> Box -> Box )
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-> Double -> Box -> State Bool Box
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boundConsistency getter setter lambda box = do
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let x@( 𝕀 x_inf x_sup ) = getter box
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c1 = ( 1 - lambda ) * x_inf + lambda * x_sup
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c2 = lambda * x_inf + ( 1 - lambda ) * x_sup
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x'_inf =
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case makeBox1Consistent ( setter ( 𝕀 x_inf c1 ) box ) of
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[] -> c1
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x's -> minimum $ map ( inf . getter ) x's
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x'_sup =
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case makeBox1Consistent ( setter ( 𝕀 c2 x_sup ) box ) of
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[] -> c2
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x's -> maximum $ map ( sup . getter ) x's
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x' = 𝕀 x'_inf x'_sup
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when ( width x - width x' >= eps_eq ) $
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State.put True
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return $ setter x' box
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-- An implementation of "bc_enforce" from the paper
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-- "Parallelization of a bound-consistency enforcing procedure and its application in solving nonlinear systems"
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--
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@ -1863,10 +1922,6 @@ allNarrowingOperators eps_eq eps_bis eqs =
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[ ( ( get_s, set_s ), ff' ) | ff' <- [ ff'_s, g1g1'_s, g2g2'_s ] ]
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]
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where
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get_t ( 𝕀 ( ℝ1 t_inf ) ( ℝ1 t_sup ), _, _ ) = 𝕀 t_inf t_sup
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set_t ( 𝕀 t_inf t_sup ) ( _, i, s ) = ( 𝕀 ( ℝ1 t_inf ) ( ℝ1 t_sup ), i, s )
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get_s ( _ , _, 𝕀 ( ℝ1 s_inf ) ( ℝ1 s_sup ) ) = 𝕀 s_inf s_sup
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set_s ( 𝕀 s_inf s_sup ) ( t, i, _ ) = ( t, i, 𝕀 ( ℝ1 s_inf ) ( ℝ1 s_sup ) )
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ff'_t (t, i, s) =
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let D22 { _D22_v = 𝕀 ( ℝ1 ee_inf ) ( ℝ1 ee_sup )
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, _D22_dx = T ( 𝕀 ( ℝ1 ee'_inf ) ( ℝ1 ee'_sup ) )
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@ -1897,3 +1952,8 @@ allNarrowingOperators eps_eq eps_bis eqs =
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, _D12_dy = T ( T ( 𝕀 ( ℝ2 _ y'_inf ) ( ℝ2 _ y'_sup ) ) )
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} = 𝛿E𝛿sdcdt $ ( eqs t `Seq.index` i ) s
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in ( 𝕀 y_inf y_sup, 𝕀 y'_inf y'_sup )
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get_t ( 𝕀 ( ℝ1 t_inf ) ( ℝ1 t_sup ), _, _ ) = 𝕀 t_inf t_sup
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set_t ( 𝕀 t_inf t_sup ) ( _, i, s ) = ( 𝕀 ( ℝ1 t_inf ) ( ℝ1 t_sup ), i, s )
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get_s ( _ , _, 𝕀 ( ℝ1 s_inf ) ( ℝ1 s_sup ) ) = 𝕀 s_inf s_sup
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set_s ( 𝕀 s_inf s_sup ) ( t, i, _ ) = ( t, i, 𝕀 ( ℝ1 s_inf ) ( ℝ1 s_sup ) )
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