Belief-Propagation Algorithm for a Traffic Prediction System based on Probe Vehicles
Texte intégral
(2) INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE. Belief-Propagation Algorithm for a Traffic Prediction System based on Probe Vehicles Cyril Furtlehner — Arnaud de La Fortelle — Jean-Marc Lasgouttes. N° 5807 Janvier 2006. ISSN 0249-6399. ISRN INRIA/RR--5807--FR+ENG. Thème BIO. apport de recherche.
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(25) Cÿ2çèÜÈ÷Kßqëã>òHñHòî{æáÃç ø ∗. †. Unité de recherche INRIA Rocquencourt Domaine de Voluceau, Rocquencourt, BP 105, 78153 Le Chesnay Cedex (France) Téléphone : +33 1 39 63 55 11 — Télécopie : +33 1 39 63 53 30.
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(199) lk i|Q{l α ´¶l¢M~¨~ a(α) xgilw{yiwlkx³|M®i|^{l$w´g{z}g Ml @Mlk^xwc|M® α Mi c(α) xgilw{yiwlkx#|M®2i|^{l$w´g{z}gMlÅg{z¨~} |M® α ¬Sf;|±l¢]g i|Q{l α . 0. 0. ``0. 0. 0. ``0. 0. 0. ×CØÙ\ׯÚ.
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(204) ]{w>lk{l$wlkxl$±yvÊkz¨k~}l$w ICg yni xgil#$|]l$w|]iYz¨{$|]lk~²Mxz}|]½M{g . ´gilkl4i|Q{l$wMl4xz¨jclH¼µwxMj³l$|
(205) ]{wlk{l$wlkxl$Wyv(y{~²]·w^@Ml$w¢¬ . c(α) t+1 α t. t−1. a(α) 78 :(; ; ?5¦ i |Q{l α ¸{z¨xwwlkx|M®@Mlk^xw . Ù;ÙÁà{iñ ó ðkò. . a(α). Miz¨xwwlkx|M®¹g{z¨~}Ylk. c(α). ¬.
(206) o¢. `1 N 5 > "D ` n9.k." Z Z 56
(207) )( ' )+Y36 3. ´¶lcMxx]g¾xgilxK§Uc]Mz²My{~}l ¬cfgil2 q|]z¨^x4{|]y@My{z¨~¨z¨xµv¾Yz}wxz¨y{{xz}|]Æ|M®ªxgil {{·Qi|¢´W]Mz²My{~}l$w τ z}w>]ww{jcτl$∈x|{0,yl1}|M®;xgil4®¯|]j α. α. pB ({τα , α ∈ G}) =. Y. p(τα |{τβ , β ∈ a(α)}). !\lkx ylWxgil«w{yiwlkx|M®i|Q{l$w ®º|]´g{z}g xgil«{|]yl«
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(210) lkilkM~´z¨α~¨~ylxgil>{|]y@My{z¨~¨z¨xµv p |M®\wMx{Mxz}|] g τ = 1iH¬m¶v $|]iwxikxz}|]/¸ixgil¶ |]z¨x{|]y@My{z¨~¨z¨xÈvjcl¢]w{l$®º|]xg{z}ww{yiwlkxg@]w2#{|^Yikx®¯|]j α∈G. ∗. α∗. . q({τα∗ , α∗ ∈ U}) =. Y. α∗. τα∗ pα∗ + τ¯α∗ (1 − pα∗ ) ,. iwz¨{#xgily|Q|]~}l¢Mi|]xMxz}|] τ¯ = 1 − τ ¬fgil{{|wl2|M®xgilM~¨
(211) |]z¨xg{j z}wx|{lkxlkj³z¨il xgil4$|]j³{~}lkxl.wlkx|M®¹jUMz¨@M~/®¯{ikxz}|]iw α∗ ∈U. X. pα (τα ) =. KQ. . {τβ ,β6=α}. D^RO E OP]eU,EG^`B=HZF . p(τα , {τβ , β ∈ G}) q({τα∗ , α∗ ∈ U}). p({τα∗ , α∗ ∈ U}). d^=E. F=V U=[PH. f gilm¢v
(212) l$wz²MUlk{l$wlkxMxz}|]Å|M®xgilz¨Y®¯lklki$lM{g/¸^M~¨xgi|]{gl2i]kx¢¸^M{l¢MwVYzǧUk{~¨x x|Ug@MiY~}ln´z¨xgÊxgilnjcl$wwM
(213) l@]wwz¨{U{|Q$l$Y{ln´g{z}gÊ´z¨~¨~ylnl2Q{~²Mz¨il$Ê~²Mxlk¢¬ gilk z¨x$|]jcl$wx|jUM·
(214) l4l2Y{~¨z}kz¨xxgil4wlkx|M®$|]iYz¨xz}|]@M~\{|]y@My{z¨~¨z¨xz}l$w p(τ |{τ , β ∈ a(α)}) ¸@z¨x z}wxlkj³{xz¨{cx|UM{{0| Yz¨jUMxlxg{z}w>]w α. ´z¨xg. p(τα |{τβ , β ∈ a(α)}) =. Zα. i|]jUM~¨z>v$z¨{$|]iwxMx. . Zα ({τβ , β ∈ a(α)}) =. Q. β∈a(α). p(τα |τβ ). Zα ({τβ , β ∈ a(α)}). X. Y. β. ,. p(τα |τβ ),. kl iw{z¨{(xg@Mx |{τ , β ∈ a(α)}) z}w4{|]y@My{z¨~¨z¨xµv±jcl¢]w{l.®º|] τ ¬ml$¢Miwl|M®¶xg{z}w i|]jUM~¨z>v°Mxz}|]Âp(τ $|]iwxMx¢¸Qz¨xª´z¨~¨~ylil$$l$ww Mvcx|n@]wwVjcl$ww M
(215) l$wMjc|]{#@Mlkxw°¸Yg@$Qz¨{ g{z¨~}z¨W$|]j³jc|]/¸{z¨W]{Yz¨xz}|]Êx|xgil4jcl$wwM
(216) l$wylkxÈ´ªl$lkW@Mlk^xw>Mig{z¨~}Ylk/¬t^ig #$|]j³{~¨z}¢Mxz}|]Âz}wYzǧUk{~¨xx|.g@MiY~}l¸!MiÅ´ªl4¢M~¨~®¯|]MW]{Yz¨xz}|]@M~;M{{| Qz¨jUMxz}|]Wyv l${lHÄi{z¨{Uxgil q|]z¨^x{|]y@My{z¨~¨z¨xµvjcl¢]w{lz¨xlkjcw|M®#@Mz¨´z}wlMi{|]j ±M·
(217) |¢Ä@lk~} τα ∈{0,1} β∈a(α). α. α. β. pM F ({τα , α ∈ G}) =. 1 Y Y ψ(τα , τβ ). Z α∈G β∈a(α). ×CØÙ\ׯÚ.
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(221) lkÂy^v ψ(τα , τβ ) = p(τα |τβ ).. xi|]j8xgilÊg{z}wx|]z}¢M~4iMx¾´¶l«jU$v g@¢
(222) l«M gilk{z}wxz}±l$wxz¨jUMxz}|]Í|M®xgilÊ$|]iYz¨xz}|]@M~ { |]y@My{z¨~¨z¨xz}l$w p(α|β) ylkxÈ´ªl$lkx|.i|^{l$w α = (`, t) Mi β = (` , t + 1) |M®/xgil>M{gÅwig xg@Mx ` Mi ` ¸;xgilU$|]l$w|]iYz¨{W~¨z¨{·Yw¢¸¹Mlc$|]{il$kxl$Sy^vS$|]lk~²Mxz}|]a~¨z¨{·¬(oµSxgil ~¨z¨j³z¨xn´gilklxgil³g{z}wx|]z}¢M~ViMxÅz}w4l2i]kx¢¸/zì l¬zÇ®xgilc]$k{jn{~²Mxz}|]axz¨jcl³z}w4wY§Ukz}lk^x~¨v ~}|]{i¸ixgil¶ q|]z¨^x{|]y@My{z¨~¨z¨xµv p(τ , τ ) xlki{wx| 0. 0. α. β. p(τα , τβ ) = εαβ τα τβ + (hβ − εαβ )¯ τα τβ + (hα − εαβ )τα τ¯β + (1 − hα − hβ + εαβ )¯ τα τ¯β .. fgiln$|]iYz¨xz}|]@M~\{|]y@My{z¨~¨z¨xµvxgilklH®º|]l4l¢]{w. p(τα , τβ ) p(τα , τβ ) + p(τα , τ¯β ) hε hβ − εαβ i αβ τα + τ¯α = τβ hα 1 − hα hh − ε 1 − hα − hβ + εαβ i α αβ τα + τ¯α . + τ¯β hα 1 − hα. p(τβ |τα ) =. gºY¬>ori. ¦ xxg{z}w|]z¨xz¨xz}w³wxMz¨gxq®º|]´¶M x|ÊjUM·
(223) lÅxgilÅ$|]{il$kxz}|] ´z¨xg xgil(Mi{|]j7oÖwz¨{ jc|Q{lk~®º|]jn{~²Mxz}|]±|M® gºY¬>ori DgºY¬èiH¬ªoµi{l$l$F¸iwlkxxz¨{UMMz¨Â®º|] α ∈ G . . sα = 2τα − 1,. MiÂiwz¨{³xgil4{|]lkxz}l$w|M®¹y{z¨@MvMz²My{~}l$w¢¸{´¶l4g@$
(224) l ´z¨xg. ψ(sα , sβ ) = exp log p(τα |τβ ) = exp Jαβ sα sβ + Hαβ sα + Hβα sβ + Cαβ , εαβ (1 − hα − hβ + εαβ ) 1 J = log , αβ 4 (hα − εαβ )(hβ − εαβ ) εαβ (1 − hα )2 (hα − εαβ ) 1 = H log αβ 4 (1 − h − h + ε )h2 (h − ε α. β. αβ. α. β. αβ ). εαβ (hβ − εαβ ) 1 = log H , βα 4 (1 − hα − hβ + εαβ )(hα − εαβ ) εαβ (hα − εαβ )(hβ − εαβ ) 1 . Cαβ = log 4 (1 − hα − hβ + εαβ )h2α (1 − hα )2. Ù;ÙÁà{iñ ó ðkò. ,.
(225) o5l. `1 N 5 > "D ` n9.k." Z Z 56
(226) )( ' )+Y36 3. xz¨@M~¨~¨v. . Hα =. X. (Hαβ + Hβα ) +. X. (Hαβ + Hβα ),. $|]j³{~}lkxl$wxgil$|]{il$kxz}|]W´z¨xgWxgiljc|^{lk~\|M®VtQl$kxz}|]ÊY¬èY¬ β∈a(α). KQ. . . U2^RB. . β∈c(α). UY[H#O\CU=E^DCOFIB ]LDXMU m U. oÈÆ|]{lkx|Êl$$|]iwxikx³xgilxK§U´¶l(iwl(Wjcl$wwM
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(231) lkilkM~VylH®º|]lcÅ$|]{il$kxz}|]¾z}wl$wxMy{~¨z}wgil$F¬ ¦ $$|]Yz¨{~¨v«´¶l³ilk~}l$kxxgil³$|]lk~²Mxz}|]iw ylkxµ´¶l$lkWxgil$wli|Q{l$wMi´z¨xlxgil q|]z¨^x{|]y@My{z¨~¨z¨xµv p τ , {τ } ]w α. α. . p τα , {τβ }β∈a(α) = p(τα ) p {τβ }β∈a(α) |τα = τα hα + τ¯α (1 − hα ). β β∈a(α). . Y. p(τβ |τα ). ´ z¨xg p(τ |τ ) z¨
(232) lkÂy^v gºY¬>oriH¬ fgilc{lHÄi{z¨xz}|]Æ|M®xgilcwgilkjcl³®º|]~¨~}|¢´wnxgil$wlcl2Y{l$wwz}|]iwfw{{|wlxg@Mx#Mxnwxlk ¸ xgilz¨iYz¨^z}Y@M~!{|]y@My{z¨~¨z¨xz}l$w¶Mlz¨
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(234) lkWyv β∈a(α). β. α. s α. ps+1 = α. X. Q. Y p(τα = 1, {τβ }) ¯β (1 − hβ ) β∈a(α) τβ hβ + τ. MiÂxgil2Ä"Yl$|]z¨xz}wxgilklH®¯|]lnw|]~¨{xz}|]W|M® {τβ }. α. pα = h α. Y h. 1+. τβ psβ + τ¯β (1 − psβ ). β∈a(α). pβ − h β i εαβ −1 . hα hβ 1 − hβ. . gºY¬èi. ¦ w´¶lUwl$l¸z¨ÆMyiwlki$l|M®ilk´,i¢v¼Ãxz¨jclÅiMxY¸´g{z}ga´ª|]{~}S®º|]$lUw|]jcl|M®xgil x| ylYzPtFlklkx³®¯|]j7xgilkz¨cg{z}wx|]z}¢M~]M~¨il h ¸ªxgilÂwgilkjcl@Mx{M~¨~¨v $|]
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(238) l$wy@]·Q´¶M z¨ xz¨jcl¸ yl$¢MiwlxgilnM{{| Qz¨jUMxlnz¨i{lklki{lki$lnz}w~}|wxylkxµ´¶l$lkWilkz¨gy|]w¢¬ β∈a(α). β. β. ×CØÙ\ׯÚ.
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