検索エンジン自作入門 Go Conference 2021 Spring

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Go Conference 2021 Spring 2021/04/24 @kotaroooo0 ݕࡧΤϯδϯ ࣗ࡞ೖ໳

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҆ୡޫଠ࿠ @kotaroooo0 αʔόʔαΠυΤϯδχΞ CLIπʔϧ, Bot, ݕࡧΤϯδϯ ࣗݾ঺հ 2

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͜ͷτʔΫ: ࣗ࡞ݕࡧΤϯδϯͷ࿩ https://kotaroooo0-dev.hatenablog.com/ 3

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λʔήοτ ݕࡧΤϯδϯʹڵຯ͋Δ ݕࡧΤϯδϯΛࣗ࡞͍ͨ͠ ΰʔϧ ݕࡧΤϯδϯͷ࢓૊Έ͕෼͔Δ GoͰݕࡧΤϯδϯΛࣗ࡞࢝͠ΊΒΕΔ 4

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Ξ΢τϥΠϯ 1. ݕࡧΤϯδϯͱ͸ ҰൠతͳݕࡧΤϯδϯͷ࢓૊Έͱߏ੒ཁૉ 2. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ঺հ ۩ମతʹࣗ࡞ͨ͠ݕࡧΤϯδϯͷߏ੒ཁૉͱಈ࡞ྫ 3. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ࣮૷ ΞϧΰϦζϜͱσʔλߏ଄ɺϥΠϒϥϦ 4. ͓ΘΓʹ ݕࡧΤϯδϯΛࣗ࡞ͨ͠ײ૝ 5

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Ξ΢τϥΠϯ 1. ݕࡧΤϯδϯͱ͸ ҰൠతͳݕࡧΤϯδϯͷ࢓૊Έͱߏ੒ཁૉ 2. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ঺հ 3. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ࣮૷ 4. ͓ΘΓʹ 6

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ݕࡧΤϯδϯͱ͸ υΩϡϝϯτͷू߹͔ΒΫΤϦʹద͢ΔυΩϡϝϯτΛฦ͢ ݕࡧΤϯδϯ ΫΤϦೖྗ υΩϡϝϯτฦ٫ υΩϡϝϯτొ࿥ 🤖 👦 Ϣʔβʔଆ ఏڙଆ ಛʹෳ਺υΩϡϝϯτ͔ΒಛఆͷจࣈྻΛݕࡧ͢Δ͜ͱΛશจݕࡧ 7 (GoogleݕࡧͰ͸Webϖʔδ) (GoogleݕࡧͰ͸ΫϩʔϦϯά)

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શจݕࡧͷछྨ G O R U B Y J S J S J S J S J S J S G O R U B Y G O R U B Y J S Grepܕ ΠϯσοΫεܕ ྫ: υΩϡϝϯτʮGO RUBY JSʯʹจࣈྻʮJSʯؚ͕·Ε͍ͯΔ͔ݕࡧ 8 ࣄલʹݕࡧର৅ͷυΩϡϝϯτͷࡧҾσʔλΛ࡞੒

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ΠϯσοΫεܕݕࡧΤϯδϯͷߏ੒ ΠϯσοΫε ΫΤϦೖྗ υΩϡϝϯτొ࿥ Analyzer Analyzer Indexer Searcher υΩϡϝϯτฦ٫ 9 Sorter ҎԼͷཁૉͰߏ੒͞Ε͍ͯ·͢(ৄࡉ͸͜ͷޙઆ໌͠·͢) ※Sorter͸࣮૷͍ͯ͠ͳ͍ͨΊɺҎޙͷઆ໌Ͱ͸লུ

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ΠϯσοΫε సஔΠϯσοΫε(ࣙॻ+ϙεςΟϯάϦετ)͕Ұൠత go js ruby 1 1 2 3 4 5 5 ࣙॻ ϙεςΟϯάϦετ 10

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Indexing “I have pens.” “We have a desk.” Indexer Analyzer จࣈྻΛ୯ޠ΁෼ղ సஔΠϯσοΫε࡞੒ 11 1 2 have pen we desk 1 1 2 2 2 సஔΠϯσοΫε υΩϡϝϯτΛసஔΠϯσοΫεʹొ࿥͢Δ

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Search ΫΤϦ “PENS” υΩϡϝϯτ1͕ώοτ Searcher Analzyer จࣈྻΛ୯ޠ΁෼ղ “PENS” → “pen” సஔΠϯσοΫεΛ୳ࡧ 12 have pen we desk 1 1 2 2 2 సஔΠϯσοΫεΛ୳ࡧͯ͠ద߹͢ΔυΩϡϝϯτΛ୳͢

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Analyzer Char Filter จࣈྻΛ୯ޠ΁෼ׂ͢Δલͷจࣈͷௐ੔ ྫ: & → & 13 Token Filter ෼ׂͨ͠୯ޠΛௐ੔ ྫ: খจࣈ΁౷Ұɺετοϓϫʔυআڈ Tokenizer จࣈྻΛ୯ޠʹ෼ׂɺදه༳Εٵऩ ྫ: I have pens → I, have, pens Char Filter Tokenizer Token Filter 3ͭ߹ΘͤͯAnalyzer จࣈྻ ෳ਺୯ޠ දه༳ΕΛٵऩ &จࣈྻΛ୯ޠʹ෼ׂ Indexing, Search྆ํͰར༻ ※྆ํͰಉ͡AnalyzerΛ࢖Θͳ͍ͱޮՌ͸ബ͍

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Ξ΢τϥΠϯ 1. ݕࡧΤϯδϯͱ͸ 2. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ঺հ ۩ମతʹࣗ࡞ͨ͠ݕࡧΤϯδϯͷߏ੒ཁૉͱಈ࡞ྫ 3. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ࣮૷ 4. ͓ΘΓʹ 14

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ͳͥݕࡧΤϯδϯΛࣗ࡞͍ͯ͠Δͷ͔ Elasticsearch͕ٕज़తɺϓϩμΫτతʹ໘ന͍ → શจݕࡧΤϯδϯͷ࢓૊ΈΛ஌Γ͍ͨ GoݚमΛडߨ → GoͰԿ͔࡞Γ͍ͨ GoͰݕࡧΤϯδϯΛ࣮૷͠Α͏💪 15

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ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ঺հ 16 ※Sorter͸ະ࣮૷

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ಈ࡞ྫ Analyzer Analyzeલ MappingCharFilter StandardTokenizer LowercaseFilter StemmerFilter StopWordFilter I feel TIRED :( I feel TIRED sad I, feel, TIRED, sad i, feel, tired, sad i, feel, tire, sad feel, tire, sad ॲཧͷྲྀΕ 17

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Analyzeલ MorphologicalTokenizer ReadingformFilter ౦ژͱژ౎ ౦ژ, ͱ, ژ౎ tokyo, to, kyoto ॲཧͷྲྀΕ ಈ࡞ྫ Analyzer 18

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ಈ࡞ྫ Indexing & Search 19 ΠϯσοΫε΁௥Ճ 1: “Go Ruby PHP” 2: “Go PHP Python” ϑϨʔζݕࡧ ”go php” ANDݕࡧ ”go php” 2ͷΈώοτ 1,2͕ώοτ 1⃣ 2⃣ 3⃣ 1⃣ 2⃣ 3⃣ 3: “Go Python Ruby”

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ಈ࡞ྫ ઃఆ΍ॳظԽ • సஔΠϯσοΫεΛӬଓԽ͢ΔMySQLઃఆ • MySQL΁ΞΫηε͢ΔӬଓԽ૚ͷॳظԽ • ΞφϥΠβͷॳظԽ • CharFilter: ͳ͠ • Tokenizer: εϖʔεͰ۠੾Δ(Standard Tokenizer) • Token Filter: খจࣈԽ 20

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ಈ࡞ྫ Indexing • సஔΠϯσοΫεΛ࡞੒͢ΔIndexerͷॳظԽ • ҎԼͷυΩϡϝϯτΛIndexing(సஔΠϯσοΫεΛੜ੒͠MySQL΁อଘ) 1: “Go Ruby PHP” • Analyzeޙ: go, ruby, php 2: “Go PHP Python” • Analyzeޙ: go, php, python 3: “Go Python Ruby” • Analyzeޙ: go, python, ruby 21 go 1 1:1 ruby php 2:1 3:1 1:2 1:3 3:3 2:2 ɾ ɾ ɾ υΩϡϝϯτID:ग़ݱҐஔ

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ಈ࡞ྫ Search ANDݕࡧ(“GO PHP”) • ΞφϥΠβͰେจࣈখจࣈͷදه༳ΕΛٵऩ • “Go”ͱ”PHP”͕྆ํؚ·ΕΔυΩϡϝϯτ1,2͕ώοτ 22 1: “Go Ruby PHP” 2: “Go PHP Python”

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ಈ࡞ྫ Search ϑϨʔζݕࡧ(“GO PHP”) • ΞφϥΠβͰେจࣈখจࣈͷදه༳ΕΛٵऩ • ϑϨʔζ”Go PHP”ΛؚΉυΩϡϝϯτ2ͷΈώοτ 23 2: “Go PHP Python”

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Ξ΢τϥΠϯ 1. ݕࡧΤϯδϯͱ͸ 2. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ঺հ 3. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ࣮૷ ΞϧΰϦζϜͱσʔλߏ଄ɺϥΠϒϥϦ 4. ͓ΘΓʹ 24

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Analyzerͷ࣮૷ 25 Analyzerߏ଄ମ • CharFilter InterfaceͷSlice • Tokenizer Interface(1ͭͷΈ) • ToknenFilter InterfaceͷSlice Analyzeϝιου • string → TokenStream(TokenͷSlice) • CharFilter, Tokenizer, TokenFilterͷॱʹ దԠ

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Char Filterͷ࣮૷ 26 CharFilter Interface • Filterϝιου ࣮૷ྫ: MappingCharFilter • Key → Value΁Ϛοϐϯά͢Δ

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Tokenizerͷ࣮૷ 27 Tokenizer Interface • Tokenizeϝιου ࣮૷ྫ: StandardTokenizer • String → TokenStream • จࣈͰ΋਺ࣈͰ΋ͳ͚Ε͹෼ׂ

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Token Filterͷ࣮૷ 28 TokenFilter Interface • Filterϝιου ࣮૷ྫ: LowercaseFilter • strings.ToLowerͰখจࣈԽ ࣮૷ྫ: StopWordFilter • ର৅ͷจࣈΛTokenStream͔Βল͘

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Token Filterͷ࣮૷ ReadingformFilter • ׽ࣈ → ϩʔϚࣈ΁ม׵͢ΔFilter • ׽ࣈ → ฏԾ໊ → ϩʔϚࣈ • ׽ࣈ → ฏԾ໊(ܗଶૉղੳث͕ߦ͏) • ฏԾ໊ → ϩʔϚࣈ(ࣗ࡞) ࣮૷ • ۪௚ͳϚοϐϯά+ ϔϘϯࣜͷϧʔϧ 29

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సஔΠϯσοΫεͷ࣮૷ సஔΠϯσοΫε(ࣙॻ+ϙεςΟϯάϦετ) • Ϛοϓ: τʔΫϯID → ϙεςΟϯάϦετ ϙεςΟϯάϦετ • ϙεςΟϯάͷϦϯΫτϦετ ϙεςΟϯά • υΩϡϝϯτID • υΩϡϝϯτதͷҐஔ৘ใ(ϑϨʔζݕࡧ༻) • ࣍ͷϙεςΟϯά΁ͷϙΠϯλ 30

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సஔΠϯσοΫεͷ࣮૷ 31 0 TokenID(mapͷkey) 3 PostingListͷPostings Postings 1 6 17 90 198 5 8 14 Postings Postings nil Next Next Next Next ※ऴ୺͸nilΛࢦ͢ TokenID 0ͷτʔΫϯ͕ υΩϡϝϯτID3,5,8,14ʹؚ·Ε͍ͯΔ͜ͱΛࣔ͢

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సஔΠϯσοΫεͷ࣮૷ 32 0 TokenID 3 PostingListͷPostings Postings 1 3 7 90 198 5 8 14 Postings Postings nil Next Next Next Next ※ऴ୺͸nilΛࢦ͢ 7 Postings Next ϦϯΫτϦετ: ͋Δϊʔυ௚ޙͷσʔλͷ௥Ճ࡟আO(1) ϙεςΟϯάϦετͰ͸υΩϡϝϯτIDͷঢॱΛΩʔϓ͢ΔͨΊ ͜ͷૢ࡞͕ଟ͘ϦϯΫτϦετ͕޲͍͍ͯΔ ϙΠϯλͷ෇͚ସ͑ͷΈ

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Indexerͷ࣮૷ ( ͷ۩ମྫ) ϝϞϦ্ͷసஔΠϯσοΫε ௥Ճ͍ͨ͠υΩϡϝϯτ go php go php MySQL্ͷసஔΠϯσοΫε సஔΠϯσοΫε΁௥Ճ ϝϞϦͱMySQLͷసஔΠϯσοΫε Ϛʔδ ӬଓԽ ”Go PHP” go, php Analyze 33 Analyzer Indexer MySQL͔ΒRead 1⃣ 2⃣ 3⃣ ϝϞϦ্ͷసஔΠϯσοΫεͷ αΠζ͕ᮢ஋Λ௒͑Δͱ… 4⃣ 3⃣ MySQL΁Write (ᮢ஋͸ετϨʔδ΁ͷΞΫηεճ਺ͱϝϞϦ࢖༻ྔͷτϨʔυΦϑ)

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Indexerͷ࣮૷ Indexerͷιʔείʔυ͸ ϙεςΟϯάϦετͷ ϦϯΫτϦετΛ૸͕ࠪओ 34

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Searcherͷ࣮૷ 35 go php go php MySQL্ͷసஔΠϯσοΫε ݕࡧΫΤϦ ”Go PHP” go, php Analyzer Analyze Searcher ద߹ͨ͠υΩϡϝϯτ τʔΫϯʹରԠ͢ΔϙεςΟϯάϦετΛ MySQL͔ΒϝϞϦ΁Read ϙεςΟϯάϦετ ૸ࠪ

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ద߹͢ΔυΩϡϝϯτΛ୳ͨ͢ΊʹͲ͏ϙεςΟϯάϦετΛͲ͏૸ࠪ͢Δ͔? DAAT(Document At A Time) • ΫΤϦʹؚ·ΕΔτʔΫϯͷϙεςΟϯάϦετͷΧʔιϧΛ͢΂ͯ։͖ಉ ࣌ʹॲཧ • υΩϡϝϯτ͝ͱʹ૸ࠪ͢Δ • Elasticsearch(Lucene)Ͱ΋࠾༻ ※DAATʹରͯ͠TAAT(Team At A Time)͕͋Δ͕ࠓճ͸ϊʔλον ࢀߟࢿྉΛఴ෇ https://www.slideshare.net/tsubosaka/top-kquery Searcherͷ࣮૷ 36

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DAATͰͷANDݕࡧ Χʔιϧ͕ࢦ͢υΩϡϝϯτ͕ҟͳΔͷͰΧʔιϧΛਐΊΔ Result = [] 37 ྫ “PHP” AND “Ruby” ݕࡧ ruby php 1 2 5 5 2 4

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DAATͰͷANDݕࡧ Χʔιϧ͕ࢦ͢υΩϡϝϯτ౳͍͠ͷͰ݁ՌʹυΩϡϝϯτΛՃ͑Δ Result = [2] 38 ྫ “PHP” AND “Ruby” ݕࡧ ruby php 1 5 5 2 4 2

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DAATͰͷANDݕࡧ Χʔιϧ͕ࢦ͢υΩϡϝϯτ͕ҟͳΔͷͰΧʔιϧΛਐΊΔ Result = [2] 39 ྫ “PHP” AND “Ruby” ݕࡧ ruby php 1 5 2 4 2 5

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DAATͰͷANDݕࡧ Χʔιϧ͕ࢦ͢υΩϡϝϯτ౳͍͠ͷͰ݁ՌʹυΩϡϝϯτΛՃ͑Δ Result = [2, 5] 40 ྫ “PHP” AND “Ruby” ݕࡧ ruby php 1 5 2 4 2 5

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DAATͰͷORݕࡧ ΧʔιϧΛಈ͔ͯ͠ɺશͯͷIDΛॏෳͳ͘௥Ճɹ ✌︎ (‘ω' ✌︎ ) ݪ࢝త ( ✌︎ ’ω') ✌︎ ※࣮ࡍͷݕࡧΤϯδϯͰ͸ORݕࡧ͸࠷దԽ͕ߦΘΕ͍ͯΔ(͜ͷτʔΫͰ͸ϊʔλον) 41 ྫ “PHP” OR “Ruby” ݕࡧ ruby php 1 2 5 5 2 4

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ҎԼೋͭͷυΩϡϝϯτ΁“Amazon Prime”ͱݕࡧ • D1: “Amazon Prime movies” • D2: “a prime concern of Amazon” ϙεςΟϯάʹυΩϡϝϯτதͷҐஔ৘ใ ୯ޠͷॱংΛߟྀͰ͖Δ D1ͷΈΛώοτͤ͞ΒΕΔ 42 ϑϨʔζݕࡧ

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ΫΤϦ“Go PHP”Ͱݕࡧ͢Δ৔߹ 43 ϑϨʔζݕࡧ go 1:1 php 2:1 1:3 2:2 υΩϡϝϯτID:ग़ݱҐஔ go 1:1-0 php 2:1-0 1:3-1 2:2-1 υΩϡϝϯτID:૬ରग़ݱҐஔ go 1:1 php 2:1 1:2 2:1 υΩϡϝϯτID:૬ରग़ݱҐஔ ૬ରग़ݱҐஔ͕౳͍͠ → ϑϨʔζΛؚΜͰ͍Δ 1: “Go Ruby PHP” 2: “Go PHP Python” ΫΤϦ্ͰGo͸0൪໨ɺPHP͸1൪໨ͳͷͰ૬ରग़ݱҐஔΛܭࢉ͢Δ సஔΠϯσοΫεʹొ࿥ͨ͠υΩϡϝϯτ

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Searcherͷιʔείʔυ΋ ϙεςΟϯάϦετͷ ϦϯΫτϦετͷૢ࡞͕ओ 44 Searcherͷ࣮૷

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Storageͷ࣮૷ ӬଓԽʹMySQLΛ࠾༻ • τʔΫϯ΍υΩϡϝϯτͷ࠾൪Λ؆୯ʹߦ͍͔ͨͬͨ • AUTO_INCREMENT • ӬଓԽʹ࿑ྗΛׂ͖ͨ͘ͳ͍ • ࢖͍׳Ε͍ͯΔMySQL • औΓସ͑΍͍͢Α͏ʹӬଓԽ૚Λந৅Խ 45

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సஔΠϯσοΫεͷѹॖ సஔΠϯσοΫεΛετϨʔδ͔ΒಡΈग़͕࣌ؒ͢ϘτϧωοΫʹͳΔ͜ͱ͕͋Δ → సஔΠϯσοΫεΛѹॖͯ͠อଘ͢Δ 46 ѹॖࡁͷసஔΠϯσοΫεΛ ετϨʔδ͔ΒಡΈग़࣌ؒ͢ ະѹॖͷసஔΠϯσοΫεΛ ετϨʔδ͔ΒಡΈग़࣌ؒ͢ < ্ͷෆ౳͕ࣜ੒ΓཱͭΑ͏ʹѹॖ ※ࠓճ͸ܭଌ·Ͱ͸͍ͯ͠ͳ͍ 600MB 1GB ׬ྃ ಡΈग़͠ ෮ݩ ಡΈग़͠ ׬ྃ సஔΠϯσοΫεͷ෮ݩ࣌ؒ ʴ

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సஔΠϯσοΫεͷѹॖ go υΩϡϝϯτID ̍ 4 21 241 412 500 560 600 888 1324 2000 2321 10940 23131 29898 3001 8090 9012 3001 8090 9012 901 1201 ϙεςΟϯάϦετʹυΩϡϝϯτID͕Կेສͱ͋Δ৔߹΋͋Γ༰ྔ͕େ͖͘ͳΔ → Մม௕ූ߸Խͱࠩ෼ྻΛ૊Έ߹Θͤͯѹॖ 47

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సஔΠϯσοΫεͷѹॖ Մม௕ූ߸ ੔਺஋ʹରͯ͠4όΠτ΍8όΠτͷݻఆ௕ූ߸ΛׂΓ౰ͯΔͷ͕ී௨ ྫ͑͹64ϏοτͷintͰ͸1΋9223372036854775807΋ಉ͡όΠτ਺ ͔͠͠ ϙεςΟϯάϦετ͸খ͍͞੔਺஋Λଟ͘ѻ͏ 48 খ͍͞੔਺஋ΛΑΓখ͍͞όΠτ਺Ͱදݱ͢ΔՄม௕ූ߸ԽΛߦ͏

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సஔΠϯσοΫεͷѹॖ ࠩ෼ྻ go ̍ 5 50 250 500 800 1000 2500 2800 υΩϡϝϯτID͸ঢॱʹιʔτ͞Ε͍ͯΔ ࠩ෼ΛͱΔ → Մม௕ූ߸Խʹ͓͍ͯ৘ใྔ͕গͳ͘ͳΔ go ̍ 4 45 200 250 300 200 1500 300 υΩϡϝϯτIDࠩ෼ 49

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సஔΠϯσοΫεͷѹॖ Մม௕ූ߸Խ • Մม௕ූ߸Խ͸ࣗ࡞ͤͣʹඪ४ύοέʔδ”encoding/gob"Λར༻ • JSON΍XML, Protocol buffersͳͲ͋Δ͕Goʹดͨ͡؀ڥͰ͸gobͷํ͕ศར • json:”hoge"ͷΑ͏ͳλά͕ෆཁ • ςΩετϕʔεͰͳ͘όΠφϦʔͰແବ͕ͳ͍ • ࣗݾهड़త • Goͷม਺ͳΒstructͰ΋nilͰ΋ΤϯίʔυͰ͖Δ(ϦϯΫτϦετ΋Ͱ͖ͨ) • gobͷunsigned intͷΤϯίʔυ • 0 → 00000000(1byte) • 7 → 00000111(1byte) • 256 → 11111110 000000001 00000000(3byte) https://blog.golang.org/gob https://golang.org/pkg/encoding/gob/ 50

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సஔΠϯσοΫεͷѹॖ 51

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Ξ΢τϥΠϯ 1. ݕࡧΤϯδϯͱ͸ 2. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ঺հ 3. ࣗ࡞ͨ͠ݕࡧΤϯδϯͷ࣮૷ 4. ͓ΘΓʹ ݕࡧΤϯδϯΛࣗ࡞ͨ͠ײ૝ 52

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͓ΘΓʹ 53 • ंྠͷ࠶ൃ໌ͰΠϯϓοτͱΞ΢τϓοτͷαΠΫϧΛճͤͨ • ࣗ࡞ָ͕͍͠(Ϟνϕʔγϣϯ) • ৄ͘͠ͳ͍ٕज़ʹ৮ΕΔඞཁ(Πϯϓοτ) • (ྫ)ΤϯίʔσΟϯά • encoding/gob • encoding/binary • protobuf • धཁ͕͋Δ(Ξ΢τϓοτ) • ϒϩά౤ߘ→ొஃ • Ξ΢τϓοτۦಈ։ൃ INPUT OUTPUT

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ࢀߟ 54 ݕࡧΤϯδϯࣗ࡞ೖ໳ɹʙखΛಈ͔͠ͳ͕Βݟ౉͢ݕࡧͷ෣୆ཪ ৘ใݕࡧ ݕࡧΤϯδϯͷ࣮૷ͱධՁ https://logmi.jp/tech/articles/322211 https://www.slideshare.net/tsubosaka/top-kquery https://artem.krylysov.com/blog/2020/07/28/lets-build-a-full-text-search-engine/ https://github.com/blevesearch/bleve ϦϙδτϦ: https://github.com/kotaroooo0/stalefish ϒϩάهࣄ: https://kotaroooo0-dev.hatenablog.com/entry/toy-search-engine

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Appendix 55

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• DAATͱରʹͳΔϙεςΟϯάϦετͷ૸ࠪํ๏ • ϙεςΟϯάϦετΛ̍ͭͣͭॲཧ • ಉ࣌ʹ։͘ϙεςΟϯάϦετͷΧʔιϧ͸̍ͭͷΈ • ୯ޠ͝ͱʹ૸ࠪ 56 TAAT(Term At A Time)

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TAATͰͷANDݕࡧ 1. ϙεςΟϯάϦετͷαΠζ͕࠷খͷ΋ͷ”ruby”Λબ୒͠ɺAccumulator࡞੒ [2, 5] 2. “php”ͷϦετΛ૸ࠪ ɾID2͸ؚ·Ε͍ͯΔ͔?ID5͸ؚ·Ε͍ͯΔ͔?ͷΈͷνΣοΫͰOK go ruby php 1 1 2 4 5 5 2 57 “PHP” AND “Ruby” ݕࡧ

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TAATͰͷORݕࡧ 1. ͲͷΩʔͰ΋ྑ͍ͷͰAccumlatorΛ࡞੒ [1,2,5] (php) 2. ॏෳ͠ͳ͍શͯͷIDΛAccumlatorʹ௥Ճ ✌︎ (‘ω' ✌︎ ) ݪ࢝త ( ✌︎ ’ω') ✌︎ ※࣮ࡍͷݕࡧΤϯδϯͰ͸ORݕࡧ͸࠷దԽ͕ߦΘΕ͍ͯΔ(͜ͷτʔΫͰ͸৮Ε·ͤΜ) 58 “PHP” OR “Ruby” ݕࡧ ruby php 1 2 5 5 2