Python ではじめる辞書学習 #1 2018年2月16日 はんなり Python #3 @ウィングス京都 

છాوࢤ ͦΊ͔ͩͨ͠ • גࣜձࣾϋΧϧε औక໾$50 • 1ZUIPO
ྺ 
೥ • ؔ+BWBɾ+"846(ɾ%FW-07&ؔ੢ ք۾ 

εύʔεϞσϦϯά • σʔλͷεύʔεੑʹண໨ͨ͠ϞσϦϯάख๏ • ೖྗಛ௃ྔͷதͷॏཁͳ΋ͷ͕Θ͔Δ • গͳ͍৘ใ͔Βݩͷ৘ใͷ෮ݩ͕Ͱ͖Δ 

໌ޙ೔౦ژͰొஃ͠·͢ 

ຊ೔ͷΰʔϧ ߦྻ෼ղ XJUI
ը૾ʹ৮ΕΔ 

ߦྻ෼ղ • ͋ΔߦྻΛผͷߦྻͷੵͰද͢ ۙࣅ͢Δ ! = #$ ઢܕํఔࣜΛղ͖΍ͨ͘͢͠Γ σʔλͷ࣍ݩѹॖ΍ಛ௃ͷநग़ʹ࢖ΘΕͨΓ 

ߦྻ෼ղͷ࣮૷ • /VN1Z • OVNQZMJOBMH ʹ 23
෼ղ΍ಛҟ஋෼ղͳͲ • TDJLJUMFBSO • TLMFBSOEFDPNQPTJUJPO ʹ 1$"
΍ *$"ɺ/.'ɺ ࣙॻֶशͳͲ 

ը૾ʹద༻ͯ͠ΈΔ • ը૾ΛҰͭͷྻϕΫτϧͱݟཱͯΔ • ෳ਺ͷը૾σʔλΛҰͭͷߦྻͱݟཱͯΔ !"" ⋯ !$" ⋮ ⋱ ⋮ !"' ⋯ !$' ཁૉ਺ Q
ͷ O
ݸͷը૾αϯϓϧ 

σʔληοτ 0MJWFUUJ
'BDFT
Y

ຕ IUUQTDTOZVFEVdSPXFJTEBUBIUNM 

1$" • ෼ࢄΛ࠷େԽ͢Δํ޲ʹओ੒෼Λநग़ • ֤ओ੒෼͸௚ަ • ࣍ݩ࡟ݮͰ͓ೃછΈ 

1$"
ͷओ੒෼ جఈʹ࡟ݮɺد༩౓ͷ߹ܭ  

1$"
Ͱ࠶ߏ੒ 

1$" # run PCA from sklearn.decomposition import PCA pca = PCA(n_components=n_components, svd_solver='randomized’, whiten=True) pca.fit(X_train) # reconstruct original space code = pca.transform(sample.reshape(1, -1)) reconstructed = pca.inverse_transform(code) 

1$" • ݩͷσʔληοτ 9
ΑΓ௿͍࣍ݩʹམͱ͢ !" = $%" 
ݸͷإը૾Λͬ͘͟Γ  ύλʔϯʹ෼ׂͨ͠Πϝʔδ 

*$" • ੒෼ͷಠཱੑʹண໨ • ࠞ߹৴߸ͷ৔߹ʹΑ͍෼཭ੑೳ 

*$" ͷಠཱ੒෼ 

*$"
Ͱ࠶ߏ੒ 

*$" # run ICA from sklearn.decomposition import FastPCA ica = FastICA(n_components=n_components, whiten=True) ica.fit(X_train) # reconstruct original space code = ica.transform(sample.reshape(1, -1)) reconstructed = ica.inverse_transform(code) 

/.' • ཁૉ͕ඇෛͱ͍͏੍໿Λିͨ͠ߦྻ෼ղ • جఈͷ଍͠߹ΘͤͰݩͷσʔλΛදݱ • ಛ௃நग़ͱͯ͠ΈΔ͜ͱ΋Մ 

/.'
ͷಛ௃ߦྻ ࣍ݩɺ࠶ߏ੒Τϥʔ ϑϩϏϊ΢εϊϧϜ
 

/.'
Ͱ࠶ߏ੒ 

/.' # run NMF from sklearn.decomposition import NMF nmf = NMF(n_components=n_components) W = nmf.fit_transform(X_train) H = nmf.components_ # reconstruct original image code = nmf.transform(sample.reshape(1, -1)) reconstructed = nmf.inverse_transform(code) 

/.' • εύʔεͳ෼ղ ਓͷը૾Λ 
ͷإͷύλʔϯͷ଍͠߹ΘͤͰදݱ 

·ͱΊ • 1$"ɺ*$"
ͱ /.'
Λෳ਺ͷը૾σʔλʹର͠ ࣮ͯࢪ • ࣍ʑճ͸ࣙॻֶश • αϯϓϧίʔυ͸ IUUQTHJUJPW"D47 

উखʹ
࣍ճ༧ࠂ • 1Z$PO 1)

Ϩϙʔτ • དྷि  ౔ ɺ ೔
ϚχϥͰ։࠵ • ฐࣾϑΟϦϐϯͷΤϯδχΞ͕ొஃ • IUUQTQZDPOQZUIPOQI • ࣍ճ͸ΜͳΓ 1ZUIPO
ʹࢀՃͰ͖Δ ͔΋