論文紹介：Neural Architecture Search with Reinforcement Learning

#;PQI BOE27-F l/FVSBM"SDIJUFDUVSF4FBSDI XJUI3FJOGPSDFNFOU-FBSOJOH z 1SPDFFEJOHTPGUI*OUFSOBUJPOBM$POGFSFODFPO -FBSOJOH3FQSFTFOUBUJPOT *$-3
೥݄೔ ؀ڥ৘ใֶ෎ ৘ใϝσΟΞ؀ڥֶઐ߈ ৘ใϝσΟΞֶίʔε ന઒ݚڀࣨ೥ ੪౻ ᠳଡ

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*$-3 •//ͷߏ଄࠷దԽʹؔ͢ΔݚڀͰɼ ࠷৽ͷ΋ͷͰ͋ͬͨͨΊ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH จݙ৘ใɾ͜ͷ࿦จΛબΜͩཧ༝

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Λ࢖༻ •$*'"3ɿఏҊख๏ͰಘΒΕͨϞσϧ ͸ɼଞͷϞσϧΑΓͷਫ਼౓޲্ͱ ഒͷֶश଎౓ͷվળ •1FOO5SFFCBOLͰ΋ݕূ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH ֓ཁ

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֬཰Qͷޯ഑Λܭࢉ ޯ഑Λ༻͍ͯɼ ֬཰QΛߋ৽

•//ͷߏ଄͓Αͼ઀ଓؔ܎͸ɼ Մม௕ͷจࣈྻʹΑͬͯࢦఆՄೳ • จࣈܥྻͷऔΓѻ͍͕Մೳͳ3//Λ࢖༻ • ߏ଄Λੜ੒͢Δ//ɿDPOUSPMMFS • ੜ੒͞Εͨߏ଄Λ࣋ͭ//ɿDIJMEOFUXPSL •ੜ੒͞Εͨߏ଄Λ࣋ͭ//ͷςετਫ਼౓
Λใुͱஔ͘ • ͜ͷͱ͖ɼ3//ͷํࡦޯ഑͕ܭࢉՄೳ •ࠓճ͸-45.Λ࢖ͬͯɼ3//Λߏ੒ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH *OUSPEVDUJPO

•ϋΠύʔύϥϝʔλ࠷దԽͷख๏͸༷ʑ •ߏ଄Ҏ֎ͷϋΠύʔύϥϝʔλ ࠷దԽ͸ɼطʹز͔ͭఏҊ͞Ε͍ͯΔ • 3BOEPNTFBSDI #BZFTJBO0QUJNJ[BUJPO •ߏ଄ͷ࠷దԽ • #BZFTJBO0QUJNJ[BUJPO
• /FVSP&WPMVUJPOɿ("ʹΑΔߏ଄୳ࡧ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH 3FMBUFE8PSL ҰൠతͰͳ͘ ॊೈੑʹ͚ܽΔ ॊೈੑ͸͋Δ͕ɼ େن໛ͳϞσϧͷ৔߹ ͕͔͔࣌ؒΔ

•લճͷ༧ଌ݁ՌΛࠓճͷೖྗͱ͢Δ ࣗݾ࠶ؼܕͷDPOUSPMMFS 3// Λ࢖༻ •ࠓճͷ໰୊Ͱ͸໨తؔ਺͕ඍ෼ෆՄೳ • ໨తؔ਺ɿςετਫ਼౓ •ಘΒΕͨςετਫ਼౓ͷ஋Λ࢖༻ֶͯ͠श
࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH 3FMBUFE8PSL •/FVSBM"SDIJUFDUVSF4FBSDI • //ʹجͮ͘ޯ഑๏ʹΑΔߏ଄୳ࡧ Ξϓϩʔν

•චऀΒʹΑͬͯఏҊ͞Ε͍ͯΔͷ͸ͭ ํࡦޯ഑ʹΑΔ3//ͷֶश๏ 3//ͷֶशΛߴ଎Խͤ͞ΔͨΊͷ෼ࢄֶश ෳࡶͳϞσϧΛੜ੒͢ΔͨΊͷ3//΁ͷ TLJQDPOOFDUJPOͷಋೖ
-45.ͷΑ͏ͳ࠶ؼతͳߏ଄Λ࣋ͭDFMMͷ ੜ੒ํ๏ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH .FUIPET

•ࠓճ࢖༻ͨ͠3//ͷߏ଄ ষΑΓ •ݸͷγʔέϯεͰͭͷ૚Λܗ੒ • 'JMUFS)FJHIU͔Β/VNCFSPG'JMUFST·Ͱ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH (FOFSBUF.PEFM%FTDSJQUJPOTXJUIB$POUSPMMFS 3FDVSSFOU/FVSBM/FUXPSL
-45. DFMM -45. DFMM TPGU NBY ग़ྗ ೖྗ /૚໨ͷ /VNCFS PG'JMUFST /૚໨ͷ 'JMUFS )FJHIU

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ͦΕͧΕͷ஋͸TPGUNBY ʹΑͬͯ֬཰ͱͯ͠දݱ

•૚਺͕نఆͷ஋ʹ౸ୡͨ͠Βɼ3//ʹ ΑΔߏ଄ͷੜ੒Λऴྃ • ੜ੒ͨ͠Ϟσϧͷ܇࿅Λߦ͏ • ܇࿅ͨ͠Ϟσϧ͔Βɼςετਫ਼౓Λܭࢉ •ੜ੒ͨ͠Ϟσϧͷςετਫ਼౓͔Βɼ ςετਫ਼౓ͷظ଴஋ͷ࠷େԽํ޲΁ 3//ͷॏΈύϥϝʔλ
Λߋ৽ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH (FOFSBUF.PEFM%FTDSJQUJPOTXJUIB$POUSPMMFS 3FDVSSFOU/FVSBM/FUXPSL ✓c ͜Ε͕ํࡦޯ഑

•3//͕ੜ੒ͨ͠ߏ଄ͷϦετɿ • ɿ༧ଌ͢΂͖ϋΠύʔύϥϝʔλͷ਺ •ੜ੒ͨ͠ϞσϧʹΑΔςετਫ਼౓ɿ •ظ଴ςετਫ਼౓ɿ •ظ଴ςετਫ਼౓ͷޯ഑ɿ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH 5SBJOJOHXJUI3&*/'03$&
a1:T R J(✓c ) = EP(a1:T ;✓c ) [R] r✓c J ( ✓c ) = T X t= 1 EP ( a 1: T ; ✓c )[ r✓c log P ( at | a ( t 1):1; ✓c ) R ] 3&*/'03$&ɿ ߦಈՁ஋ΛใुͰۙࣅ T

•ޯ഑͸ϞϯςΧϧϩ๏ʹΑͬͯਪఆɿ • ͸ճ͋ͨΓʹੜ੒ͨ͠ߏ଄ͷݸ਺ • 3//ͷύϥϝʔλߋ৽ ˠNݸͷαϯϓϧʢߏ଄ʣΛαϯϓϦϯά ˠͦΕͧΕͷςετਫ਼౓ ͱ্ࣜʹ Αͬͯ3//ͷύϥϝʔλߋ৽ˠʜ
࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH 5SBJOJOHXJUI3&*/'03$& m R1 ⇠ Rm r✓c J ( ✓c ) ⇡ 1 m m X k= 1 T X t= 1 r✓c log P ( at | a ( t 1):1; ✓c ) Rk = 0 B B B B B @ 1 m m X k= 1 Rk 1 C C C C C A ⇥ 0 B B B B B @ T X t= 1 r✓c log P ( at | a ( t 1):1; ✓c ) 1 C C C C C A

•ޯ഑ͷਪఆ஋͸ෆภਪఆྔ •ͨͩ͠ɼ෼ࢄ͕ඇৗʹେ͖͍ͷͰ ϕʔεϥΠϯΛ࢖༻ •ϕʔεϥΠϯ ʹ͸ɼաڈͷςετਫ਼౓ ͷࢦ਺ҠಈฏۉΛ࢖༻ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH 5SBJOJOHXJUI3&*/'03$&
r✓c J ( ✓c ) ⇡ 1 m m X k= 1 T X t= 1 r✓c log P ( at | a ( t 1):1; ✓c )( Rk b ) b bt = ↵R + (1 ↵)bt 1

•ฒྻԽͱඇಉظߋ৽ʹΑΔ3//ͷ܇࿅ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH 5SBJOJOHXJUI3&*/'03$& DIJME͸ͦΕͧΕςετਫ਼౓Λܭࢉ 3FQMJDB͸ύϥϝʔλ Λ4FSWFSʹฦ͢ 4FSWFS͸3FQMJDBʹ ύϥϝʔλΛ౉͢

•(PPH-F/FU΍3FTJEVBM/FUʹ ୅ද͞ΕΔΑ͏ͳ૚Λ·͙ͨ݁߹΋ ୳ࡧͷର৅ͱ͢ΔΑ͏ʹ֦ு͢Δ •૚Λ·͙ͨ݁߹Λ؅ཧ͢Δ"OLFSQPJOU Λγʔέϯεʹ௥Ճ •૚Λ·͙ͨ݁߹Λੜ੒͢Δ֬཰͸ TJHNPJEؔ਺ʹΑܾͬͯఆ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH
*ODSFBTF"SDIJUFDUVSF$PNQMFYJUZXJUI4LJQ $POOFDUJPOTBOE0UIFS-BZFS5ZQFT P (Layer j is an input to layer i) = sigmoid( vT tanh( W prev ⇤ hj + W curr ⇤ hi )) IϨΠϠʔʹؔ͢ΔӅΕঢ়ଶ IҎ֎͸܇࿅Մೳͳύϥϝʔλ

•૚Λ·͙ͨ݁߹΋֬཰ͱͯ͠දݱ͞ΕΔ ͨΊ3&*/'03$&ʹΑΔֶश͕Մೳ •֦ு͞Εͨ3//ͷߏ੒ਤ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH *ODSFBTF"SDIJUFDUVSF$PNQMFYJUZXJUI4LJQ $POOFDUJPOTBOE0UIFS-BZFS5ZQFT

•-45.ͷΑ͏ͳ࠶ؼܕͰ಺෦ঢ়ଶΛ࣋ͭ ηϧͷߏ଄Λ୳ࡧ͢Δ •ηϧ΁ͷೖྗ͸ͭ • εςοϓ໨ͷग़ྗɿ • ηϧͷ಺෦ঢ়ଶɿ • લͷ૚͔Βͷग़ྗɿ
•ग़ྗ͸ ͱ ͷͭ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH (FOFSBUF3FDVSSFOU$FMM"SDIJUFDUVSFT t 1 xt ht 1 ct ht ct 1

•ॲཧΛෳ਺ͷϊʔυʹ෼ׂ • ֤ϊʔυͰߦ͏ॲཧΛ3//ʹΑͬͯ֬཰త ʹܾΊ͍ͯ͘ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH (FOFSBUF3FDVSSFOU$FMM"SDIJUFDUVSFT

•'JHVSFͰߦΘΕΔߏ଄ͷ༧ଌɿ • 5SFF*OEFYɿ"EEԋࢉΛͨ͠ޙʹ5BOI Λ͔͚Δ͔ • 5SFF*OEFYɿཁૉ͝ͱʹੵΛͱͬͨޙʹ 3F-6Λ͔͚Δ͔ • $FMM*OKFDUɿ5SFF*OEFYͷग़ྗʹ಺෦
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•࣮ݧʹ࢖༻ͨ͠σʔληοτ͸ͭ • $*'"3 • 1FOO5SFFCBOL •$*'"3͸4FDUJPOʹج͍ͮͯ ৞ΈࠐΈ//ͷߏ଄୳ࡧ •1FOO5SFFCBOL͸4FDUJPOʹ ج͍ͮͯ࠶ؼܕηϧͷߏ଄୳ࡧ
•࠷ྑͷςετΤϥʔΛใࠂ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH &YQFSJNFOUTBOE3FTVMUT

• 3//ͷߏ੒ • -45.ͭɼϢχοτ਺͸ݸ • < >ͷҰ༷ཚ਺ͰॳظԽ • "EBN
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• ΤϙοΫ਺ɿ • /FTUFSPW .PNFOUVN4(%Ͱ࠷దԽ • ֶश཰ɼ׳ੑ߲ • ਖ਼ଇԽ߲ɿ8FJHIU%FDBZ
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•܇࿅σʔλɿຕ •ςετσʔλɿຕ •લॲཧ • ന৭Խ • ը૾ΛϥϯμϜʹ֦େ͓Αͼ൓స σʔλ֦ு
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•Wͷ݁Ռʹ͍ͭͯɼैདྷ๏ΑΓ΋ઙ͘ɼ ͔ͭਫ਼౓͕ߴ͍ߏ଄Λ֫ಘ • "QQFOEJY"ͷ'JHVSFͷߏ଄ •ϑΟϧλͷܗঢ়͸௕ํܗ͕ଟ͘ɼಛʹ ग़ྗʹ͍ۙ૚Ͱ͸େ͖͍ϑΟϧλ •ߏ଄ͷมߋʹऑ͍ɼہॴతͳ࠷దੑ • શͯͷ૚ʹର͠ɼ૚Λ·͍ͨͨ݁߹Λ
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•Wͷ࣮ݧͰ͸ɼWʹՃ͑ͯετϥΠυ αΠζͷ࠷దԽ΋ߦ͏Α͏ʹมߋ •୳ࡧۭؒ͸େ͖͘ͳ͕ͬͨɼ ͞΄Ͳਫ਼౓͕ѱ͘ͳΔ͜ͱ͸ͳ͔ͬͨ •Wͷ࣮ݧͰ͸ɼWʹՃ͑ͯ૚໨ͱ ૚໨ͷޙʹૠೖ͢ΔϓʔϦϯά૚ͷ ࠷దԽ΋ߦ͏Α͏ʹมߋ • ૚ͷશ݁߹૚Λ࣋ͬͨ૚ͷϒϩοΫ
͝ͱʹߏ଄Λ୳ࡧʢ୳ࡧۭؒͷ੍ݶʣ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH -FBSOJOH$POWPMVUJPOBM"SDIJUFDUVSFTGPS$*'"3

•ͦͷ݁ՌɼΤϥʔ͸·Ͱվળ •ಘΒΕͨߏ଄ͷϑΟϧλʔ਺ΛͦΕͧΕ ݸ૿΍͢ͱΤϥʔ͸·Ͱվળ •·ͨɼΤϥʔͷ%FOTF/FUϞσϧ ͱൺֱͯ͠ഒͷ଎͞Ͱֶश͕ਐߦ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH -FBSOJOH$POWPMVUJPOBM"SDIJUFDUVSFTGPS$*'"3

•σʔληοτ͕খ͍ͨ͞Ίਖ਼ଇԽ͕ඞཁ •छྨͷ%SPQPVUΛ࢖༻ • &NCFEEJOH%SPQPVUɿ૚ͷؒͷ݁߹ʹ %SPQPVUΛ͔͚Δ<;BSFNCB FUBM > • 3FDVSSFOU%SPQPVUɿ࣌ؒํ޲ͷ݁߹ʹ
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•3// $POUSPMMFS ͸݁߹ํ๏ͱ ׆ੑԽؔ਺Λ༧ଌ • ݁߹ํ๏ɿ"EEɼ&MFN@NVMU • ׆ੑԽؔ਺ɿJEFOUJUZ UBOI
TJHNPJE SFMV •ೖྗϖΞʹର͢Δॲཧ͸छྨ༧ଌ ࿦จ঺հɿ/FVSBM"SDIJUFDUVSF4FBSDIXJUI3FJOGPSDFNFOU-FBSOJOH -FBSOJOH3FDVSSFOU$FMMTGPS1FOO5SFFCBOL ͜ͷϨϕϧͷϊʔυ͕ͭଘࡏ

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論文紹介：Neural Architecture Search with Reinforcement Learning

論文紹介：Neural Architecture Search with Reinforcement Learning

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