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Fast and Simple Computations on Tensors with Log-Euclidean Metrics.

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(1)Fast and Simple Computations on Tensors with Log-Euclidean Metrics. Vincent Arsigny, Pierre Fillard, Xavier Pennec, Nicholas Ayache. To cite this version: Vincent Arsigny, Pierre Fillard, Xavier Pennec, Nicholas Ayache. Fast and Simple Computations on Tensors with Log-Euclidean Metrics.. [Research Report] RR-5584, INRIA. 2005, pp.42. �inria00070423�. HAL Id: inria-00070423 https://hal.inria.fr/inria-00070423 Submitted on 19 May 2006. HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés..

(2) INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE. Fast and Simple Computations on Tensors with Log-Euclidean Metrics. Vincent Arsigny — Pierre Fillard — Xavier Pennec — Nicholas Ayache. N° 5584 May 2005. N 0249-6399. ISRN INRIA/RR--5584--FR+ENG. Thème BIO. apport de recherche.

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(84) U $    $ .  M (n) n∗n      .  $  

(85).   \    (λ1 , ..., λn ) #     \   %.    7 

(86)   .   . ?. . .   n∗n   $ . n∗n   $.  .    #e #$ . E. m.  $. .    $ 

(87) $ 

(88)  $ #   Y #  

(89) . M Sp(M )   c 

(90)    H . .  $  . .  . M. (λi )i∈1...n. 1   c

(91)        

(92)   . $ Y (  \ $ # $   # B  >  . +φ: `E c→ 

(93) F 

(94)  U   \ E  +       3 H    +  #      # m ∈  E  .  . n∗n. .  

(95)   H0 !   $   

(96)    \\

(97) . dM. Dm φ.dM. egf{jujH”{|ikz}”1Žbv‡z©|R#” "oe9jH”1tw|R 8q]Œ‘Ž’j%$/’|RikjHt½´¶ o|Ri)µ­e8°²šÐ$m) HG .

(98) ª]³$f{j ‡j/{z¯ÈLƒ1toz©|R”’|b¬bŽ oz‚Ž‰”1’j iŽ‰vo ‡z}’jHtgŽ‰ ‡j&’Ž‰~}~}jHEvoj”‘tw|R ‡tH« '&. () * +, -/.0-124356  7. egf1jj±uŒW|”{jH”Rv‡z}Ž~{Œ{~‚Žœsut†Ž’jH”Bvo “Ž‰~{ ‡|~}j$z©K” e + ¹tojj  %1ªB Gª I,

(99) *«QÆ¿j³$z}~©~W’|”‘twz‚uj ½f{j ‡j$|”{~}s v‡f{jiŽbv‡ oz©±Ð¬jH ‡toz©|R”T|´4v‡f{jj±uŒW|”{jH”Rv‡z}Ž~Kª9³$f{z}’“f¿z‚t&ŽEv‡|]|~Qv‡f1Žbv&³8jxj±]voj”‘twz}¬jH~©sЃ‘twjkz}”™v‡f{j”{j±Bv tojH’voz}|”1tH«[Æ¿jE ‡jH’Ž~©~4z¯v“t¸{j®1”{z©voz}|”9ª†Ž‰”1#€Rz©¬Rjz¯v“t jH~©jHikj”Bv‡Ž os™Œ{ o|RŒ‘jH wv‡z©jIt«ÐÃŽtwv y{ƒuvk”{|v ~©jIŽtwvHª ³8jE€Rz©¬Rjvof1jlgŽ‰·Rj o° ¨ ŽikŒ{y‘jH~©~©° i^Ž‰ƒ‘tou|R wÈÀ´¶|R oi¸ƒ{~‚Ž{«Tmdvkz‚t¸ŽT¬j ‡s¿®1”{jEvo|]|~4vof1Ž‰vxŒ1 o|b¬]z‚ujHt¸ujjHŒ z}”1toz©€RfBv‡t&z}”¾ÃÄz}Yj S/ o|Rƒ{Œ1tH«Æ¿j³$z}~©~½®1”1#z©v f{z}€f{~}sTƒ‘twj´¶ƒ{~†v‡|T’|RixŒ‘Ž‰ ‡jkÃ9|€°?‹†ƒ‘’~}z}ujIŽ‰”#ikjHŽ”1tvo| Ž‰»”{j°dz©”]¬bŽ‰ ‡z‚Ž‰”Bv4ikjHŽ”1t$z}”qujH’‰« L1« P∞ M  aÊ f* '¶>£ ' 3Î * -8 ! #j

(100)   +  E      U    exp(M ) M exp(M ) =  9!, 

(101)      

(102)  \ G 

(103) ∈ GL(n)   3 #  #    M ∈ M (n) N G = log(M ). 

(104)  . G = exp(M ).  # . k. M.  En=0   $k! . m²”€j”1j “Ž‰~?ª:vof{j~©|R€RŽ oz©vof{i |‰´/ŽÐ ‡jHŽ‰~8z}”B¬Rj ovoz}y{~}jEiŽbv‡ oz©±ÀikŽœs#”{|vxj±uz}twvHª†Ž”1¾z©´^z©vxj±]z‚twv‡txz¯v iŽœsx”{|‰v8y‘j/ƒ{”{z‚Bƒ{j«Qegf{j­~}ŽR’“·k|‰´Äj±uz‚tŠv‡j”1’j^z‚t4Ž€j”1j “Ž‰~1Œ1f{j”{|Rikj”{|R”z©”’|”1”{jH’vojHEÃÄz}j^€ ‡|ƒ1Œ1t« n­”1j^€jH”{j “Ž‰~}~}s¸”{jHjH{t  # j±uŒ‘|R”{j”Bvoz‚Ž‰~‚t½vo|x ojIŽ’“fj¬Rj ‡skj~}jikj”Bv  R– ?«Qegf{j/~‚Ž’“·k|‰´9ƒ1”{z}Bƒ{jH”{jHt‡t4z}t jItotoj”Bv‡z}Ž~©~}suƒ1jvo|vof{j¸z©”  ƒ{j”1’j |´: ‡|‰v“Žbv‡z©|R”1t 4 o|v‡Ž‰voz}”{€|‰´½Ž”ÐŽ‰”{€R~©j α z}t^vof1j¸t‡Ž‰ikjŽt^ o|v‡Žbv‡z©”1€ kkml n

(105) oop$q.

(106) GIž.  $ U e . | ´Ž‰”Ž‰”{€R~©j α + 2kπ ³$f1j ‡j k z}tgŽ‰”z©”Bv‡j€jH H«†q]z}”1’j^v‡f{j~©|R€RŽ‰ ‡z©vof{i(|‰´Ž ‡|‰v“Žbvoz}|”EikŽ‰vo ‡z¯±E{z© ‡jH’vo~}s {jŒWj”1{t¸|”Àz©v‡t¸ ‡|‰v‡Ž‰voz}|”ÀŽ‰”1€~}jHt ¹|”{jŽ‰”{€R~©jEtoƒu»’jItz}” %µ¸ªy{ƒuvxtoj¬Rj “Ž‰~½Ž”{€~}jHt Ž‰ ‡j”{jH’jHt‡toŽ os ³$f1j” n > 3

(107) *ªWz¯v/z}t^”{|‰v^ƒ1”{z}Bƒ{jR«ci|b³8j¬Rj Iª{³$f{jH”TŽiŽbv‡ oz©±z‚t­toƒu»’z}j”Bv‡~©s’~}|Rtoj&vo|vof{j¸z}ujH”Bvoz©vŠsª v‡f{j”ÀŽ~©|R€RŽ oz©vof{i Ž‰~}³8Žœsut­j±uz}twv‡tHª9Ž”1Tik|R ojH|b¬j Ž‰ik|R”{€Ž~©~Qj±uz}twvoz}”{€~©|R€RŽ oz©vof{itHªLvof{jH ojŽ~©³gŽœsut j±uz}twv‡t8|”1j^³$z©voftwiŽ‰~}~}jHtwv8”{|R oiªu’Ž~©~}jH 3  

(108)  1  \  

(109) x«†mdv$z}t8€Rz©¬Rj”y]skvof1j­´¶|R~©~}|b³$z}”{€¸toj ‡z©jIt log(Id + M ) =. ∞ X (−1)k+1. k. [

(110). M k.. egf1z}t4twjH oz}jHt½z}t8Ž‰y1to|~}ƒuv‡j~}s¸’|R”]¬j ‡€jH”BvQ´¶| kM k <k=11 ³$f{jH oj k.k z‚t½Ž”EŽ‰~}€jHy{ “Ž­”1| ‡iªBz?« jR«¬Rj ‡z¯´¶s]z}”{€ ´¶|R Ž‰~}~9t‡Rƒ‘Ž‰ ‡j­iŽbv‡ oz‚’jIt M, N « kM.N k ≤ kM k.kN k 5 4 Ê]Î ¤ Ê &     ∞  (  \  ! c+      # 

(111)  exp : M (n) → GL(n) C M ∈ M (n).    \E    

(112)   $   P   3 U $ ∞ X 1 DM exp .dM = k! k=1. 

(113) . . k−1 X. dM ∈ M (n). M. l=0. k−l−1.    . .dM.M. l. !.   . ¹—

(114). .. ?¤ ÎÄ3Î 2  egf{j4toik|B|vof{”1jHt‡tÄ|‰´ z}ttwz}ikŒ{~}sŽ­’|R”1twjIBƒ{j”1’j†|‰´uv‡f{j½ƒ1”{z¯´¶|R oiOŽy1tw|R~©ƒ{voj½’|”]¬jH o€Rj”1’j |´†z¯v“ttwjH oz}jHt^j±uŒ1Ž‰”‘twz}|”Ðz}”TŽ”Bs[exp’|ikŒ1Ž’v/tojv/|‰´ M (n) «/egf1jxuz©ÈLj ‡j”Bvoz‚Ž‰~z}t­|y{v‡Ž‰z}”{jIT’~‚Žt‡toz}’HŽ‰~}~©s y]sEŽ¸v‡j ‡iy]svojH oi uj ‡z}¬œŽ‰voz}|”|‰´vof{jtoj ‡z©jItguj®1”1z©”{€kv‡f{j&j±uŒW|”{jH”Bvoz‚Ž‰~?« Æ¿j8tojj4f{j ‡j†v‡f1Žbvvof{j8”{|R”u°d’|iki ƒ{v‡Žbv‡z©¬]z©vŠs|‰´{v‡f{j4iŽ‰vo ‡z¯±&i ƒ1~¯v‡z©Œ{~}z‚’Žbv‡z©|R”¸’|ikŒ{~}z}’HŽbvojIt9toj ‡z©|Rƒ1to~©s v‡f{juz©ÈWjH ojH”Bvoz‚Žbvoz}|”¿|‰´4vof{jj±uŒ‘|R”{j”Bvoz‚Ž‰~?ª9³$f1z}’“f¿z}ti ƒ1’“f#twz}ikŒ{~}j &z}”™v‡f{jt‡’Ž‰~‚Ž‰ &’HŽtoj« i|b³8j¬Rj Iª v“Ž‰·]z}”{€xvof{jv‡ ‡ŽR’j/z©”‹½W« ¹—

(115) 8s]z©jH~}{t !#   !   $  

(116)    < Î ¤ Î ' '¹¥u¤ Ë &   3 $ ∀M, N ∈ M (n) : (M.N ) = (N.M ) # !# U $. (DM exp .dM ) =. !# U $. I

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