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機械学習図鑑の眺め方
Asei Sugiyama
August 08, 2019
Technology
2
380
機械学習図鑑の眺め方
みんなのPython勉強会#48 - connpass
https://startpython.connpass.com/event/124253/
で発表する資料です
Asei Sugiyama
August 08, 2019
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Transcript
ػցֶशਤؑͷோΊํ ΈΜͳͷ Python ษڧձ#48 - connpass
࣍ 1.ॻ੶Ͱѻ͏ΞϧΰϦζϜͷશମ૾ 2.ྨ 3.ճؼ 4.ΫϥελϦϯά 5.࣍ݩݮ 6.࠷ޙʹ
ࣗݾհ • ਿࢁ Ѩ • Software Engineer @Repro • ػցֶशͱ͔౷ܭͱ͔։ൃͱ͔
• ػցֶशਤؑ ڞஶ
ΞϧΰϦζϜͷղઆํ 1.Πϝʔδ͕ΘΔΑ͏ʹ͢Δ • Web ΤϯδχΞ͕งғؾΛΘ͔Δ • ݫີ͞ΑΓΘ͔Γ͢͞ 2.ࣜΛ༻͍ͨৄࡉͳهड़ߦΘͳ͍ • ຊޠͱਤͰؤுΔ
• ຊࢿྉͷਤͷେຊ͔ΒҾ༻
հ͢ΔΞϧΰϦζϜ ͷબఆج४ • ػցֶशΞϧΰϦζϜΛ၆ᛌͰ͖ΔΑ ͏ʹબఆ • scikit-learn ͷ Choosing the
right estimator Λࢀߟʹબఆ
None
None
ྨ (Classification) • ࢄΛ༧ଌ͢Δ ! y -1 0 0 0
1 1 2 ? 3 1
ྨͷྫ • ΞϠϝͷྨ͕༗໊ • ΨΫย (sepal) ͱՖห (petal) ͷ ͞ͱ෯͔ΒΞϠϝͷछྨΛ༧ଌ
• σʔλ͔Βܾఆڥք (ڥ) Λֶश
ྨʹద༻Ͱ͖ΔΞϧΰϦζϜ • ϩδεςΟοΫճؼ • αϙʔτϕΫτϧϚγϯ • φΠʔϒϕΠζ • ϥϯμϜϑΥϨετ •
χϡʔϥϧωοτϫʔΫ • kNN
αϙʔτϕΫτϧϚγϯ • ΞϧΰϦζϜϋΠύʔύϥϝʔλʔʹ Αֶͬͯश͢Δܾఆڥքͷܗ͕ҟͳΔ • ಉ͡σʔλΛ༻͍ͯɺαϙʔτϕΫτϧ ϚγϯͷΧʔωϧؔΛมֶ͑ͯश͞ ͤͨ݁Ռ͕ӈਤ
None
༩͑ํʹΑͬͯΑ͘Θ͔Βͳ͍ܗʹͳΔ
None
ճؼ (Regression) • ࿈ଓΛ༧ଌ͢Δ ! ! y 1 0 1
1 1 2 2 2 ? 2 3 5
ճؼͷྫ • ϘετϯͷॅՁ֨༧ଌ͕༗໊ • ΑΓ؆୯ͳσʔλͱͯ͠ΞϯείϜ ͷσʔληοτ͕͋Δ (ӈਤ) • ͜ΕΒͷΛ͏·ۙ͘ࣅ͢ΔΑ͏ͳۂ ઢ
(ઢΛؚΉ) Λֶश͢Δ
ճؼʹద༻Ͱ͖ΔΞϧΰϦζϜ • ઢܗճؼ • αϙʔτϕΫτϧϚγϯ • ϥϯμϜϑΥϨετ • χϡʔϥϧωοτϫʔΫ •
kNN
ΞϯείϜͷσʔληοτ • ՄࢹԽͷॏཁੑΛࣔ͢σʔληοτ • 4 ͭͷσʔληοτʹ͍ͭͯɺ࣍ͷ ͕΄΅ಉ͡ 1.ฏۉ 2.ࢄ 3.૬ؔ
4.ճؼઢͷยͱ͖ • ࢦඪΛ༻͍ͨධՁՄࢹԽ྆ํॏཁ
None
ΫϥελϦϯά • ͜Ε·Ͱڭࢣ͋Γ • ͋ΔมͷΛ༧ଌ͢Δ • ͔͜͜Βڭࢣͳ͠ • σʔλͦͷͷ͔Βֶश͢Δ •
ΫϥελϦϯά • ࣅͨͷಉ࢜ͷσʔλΛΫϥελͱ ͯ͠·ͱΊΔख๏ • ࠨͷਤͷσʔλΛӈͷਤͷΑ͏ʹ σʔλΛׂ͢Δ
ΫϥελϦϯάΛߦ͏ΞϧΰϦζϜ • k-means ๏ • ࠞ߹Ψε (Λ༻͍ͨΫϥελϦϯά) • etc.
k-means ๏ͷֶशͷ༷ࢠ • Ϋϥελͷॏ৺ΛదʹܾΊΔ (ΫϥελࣗͰܾΊΔ) • σʔλΛ͍ۙ΄͏ͷʹྨ͠ɺฏۉΛٻΊΔ͜ͱΛ܁Γฦ͢
None
࣍ݩݮ • ՄࢹԽେࣄ (ΞϯείϜͷσʔληοτ) • σʔλΛՄࢹԽ͢Δ͜ͱࠔͳ͜ͱ͕ଟ͍ • ΞϠϝσʔλͰΨΫย͞ͱ෯ɺՖหͷ͞ͱ෯Λߟ͑Δ ͱ 4
࣍ݩͳͷͰͦͷ··ͰՄࢹԽͰ͖ͳ͍ • σʔλͷߏΛอͬͨ··͏·࣍͘ݩΛམͱ͍ͨ͠ • σʔλͷഎܠʹͳ͍ͬͯΔใΛ͏·͘நग़͍ͨ͠
࣍ݩݮͷྫ • 3 ࣍ݩ͔Β 2 ࣍ݩʹ࣍ݩݮͨ͠ྫ • (a) ݩσʔλ •
(b) LLE Ͱ࣍ݩݮ • (c) PCA Ͱ࣍ݩݮ • LLE ͷํ͕ݩͷߏΛอͬͨ··ల։ Ͱ͖͍ͯΔ
࣍ݩݮΞϧΰϦζϜ • PCA • LSA • NMF • LDA •
t-SNE • etc.
खॻ͖จࣈσʔλͷ࣍ݩݮ
࠷ޙʹ • ΞϧΰϦζϜ͕ͯ͢Ͱͳ͍ • ͦΕҎ֎ʹେมͳͱ͜Ζ͕͋Δ
An Extended Version Of The Scikit-Learn Cheat Sheet1 • ๏໘େৎʁ
• σʔλʹΞΫηεͰ͖Δʁ • σʔλͷதཧղͨ͠ʁ • σʔλ͖Ε͍ʁ • ՝໌֬ʁ 1 https://medium.com/@chris_bour/an-extended-version-of-the- scikit-learn-cheat-sheet-5f46efc6cbb
Recap ࣍ ༰ 1. ॻ੶Ͱѻ͏ΞϧΰϦζϜͷશମ૾ ྨɾճؼɾΫϥελϦϯάɾ࣍ݩݮΛѻ͏ 2. ྨ ࢄΛ༧ଌ͢Δ 3.
ճؼ ࿈ଓΛ༧ଌ͢Δ 4. ΫϥελϦϯά ࣅͨͷಉ࢜ͷσʔλΛ·ͱΊΔ 5. ࣍ݩݮ ෳࡶͳߏͷσʔλΛγϯϓϧʹ͢Δ 6. ࠷ޙʹ ݱ࣮ෳࡶͳͷͰΞϧΰϦζϜҎ֎େ