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Recsys2014 recruit
1.
Recsysຮᙉ2014 Gradient boos4ng
factoriza4on machines ᆤᆏṇᚿ m.tsubosaka@gmail.com
2.
Context-‐aware recommenda4on •
Tradi4onal recommenda4on – 䝴䞊䝄䛸䜰䜲䝔䝮䛾䝺䞊䝔䜱䞁䜾ሗ䛜䛘䜙䜜 䛯≧ἣ䛷䝴䞊䝄䛸䜰䜲䝔䝮䛾ᑐ䛻ᑐ䛧䛶䝺䞊䝔䜱 䞁䜾䜢ண 䛩䜛䜘䛖䛺㛵ᩘ䜢Ꮫ⩦䛩䜛 – ௦⾲ⓗ䛺ᡭἲ䛻Matrix factoriza4on䛜䛒䜛 • Context-‐aware recommenda4on – 䝴䞊䝄䛸䜰䜲䝔䝮䛰䛡䛷䛿䛺䛟䚸䝴䞊䝄䛾䝮䞊䝗 䜔ఇ᪥䛛䛹䛖䛛䛺䛹䝺䝁䝯䞁䝗䛾䛸䛝䛾context䜒 ⪃៖䛧䛶䝺䝁䝯䞁䝗䜢⾜䛖
3.
Factoriza4on machine •
Matrix factoriza4on䛺䛹factoriza4on䛾ᡭἲ䜢୍⯡䛧䛯 ᡭἲ – KDD Cup 2012䛷SNS䛷䛾䛴䛺䛜䜚ண 䜔ᗈ࿌䛾CTRண 䛺䛹ᐇ 㝿ⓗ䛺䝍䝇䜽䛻ᑐ䛧䛶䜒㧗䛔⢭ᗘ䜢㐩ᡂ䛧䛶䛔䜛 – Rendle, Social networks and click-‐through predic4on with factoriza4on machines, KDDCUP 2012 yi = • ᢅ䛖䝕䞊䝍䛿䜹䝔䝂䝸ኚᩘ䜢⪃䛘䚸䝧䜽䝖䝹䛷⾲⌧䛩䜛 – 䛘䜀䝴䞊䝄䛜{U1,U2,U3},䜰䜲䝔䝮䛜{I1,I2,I3,I4},䝮䞊䝗䛜 {happy,normal,sad}䛾ሙྜ – U1䛻I2䜢䝮䞊䝗䛜happy䛺䛸䛝䛻᥎⸀䛩䜛≧ἣ䛷䛿䝧䜽䝖䝹⾲ ⌧䛸䛧䛶䛿(1,0,0, 0,1,0,0, 1,0,0)䛾䜘䛖䛻⾲⌧䛩䜛 • ≉ᚩ㔞䛛䜙䛾ண 䛻䛚䛔䛶ḟ䛾㡯䜎䛷⪃៖䛩䜛 – ୖ䛾䛻⨨䛔䛶䛿U1*I2, U1*happy, I2 * happy䛾୕䛴䛾┦ స⏝䛻䛴䛔䛶㔜䜏䜢ィ⟬䛩䜛
4.
Factoriza4on machine •
ḟ䛾┦స⏝䜢䛭䛾䜎䜎䛩䜉䛶㔜䜏䜢ồ䜑䜘 䛖䛸䛩䜛䛸䝟䝷䝯䞊䝍䛾ᩘ䛜⭾䛻䛺䜛 • 䛣䛾䛯䜑ḟ䛾┦స⏝㡯w_ij䜢kḟඖ䝧䜽䝖䝹 䛾ෆ✚䛷㏆ఝ䛩䜛 – n * n䛾ኚᩘ䛾௦䜟䜚䛻n*k䛾ኚᩘ䜢⏝䛩䜛 Rendle, Factoriza4on machine, ICDM 2010䜘䜚
5.
Gradient boos4ng factoriza4on
machine • Factoriza4on machine䛿┦స⏝䜢⾲⌧䛩䜛 ୖ䛷䛿ᙉຊ䛺ᡭἲ䛷䛿䛒䜛䛜䚸䛒䜎䜚ண 䛻 ᐤ䛧䛺䛔┦స⏝䜎䛷䝰䝕䝹䛻ධ䜜䜛䛸䛔 䛖ၥ㢟䛜䛒䜛 • 䛭䛣䛷ᮏㄽᩥ䛷䛿ண 䛻ᐤ䛧䛶䛔䛟䜘䛖䛺 㡰␒䛷┦స⏝㡯䜢㏣ຍ䛧䛶䛔䛟᪉ἲ䜢ᥦ ⤂ㄽᩥ䜘䜚ᘬ⏝
6.
ᐇ㦂⤖ᯝ • ᪤Ꮡ䛾PMF(Probabilis4c
matrix factoriza4on), FM(Factoriza4on machine)䛸ẚ㍑䛧䛶䜘䛔⢭ᗘ䛜 䛷䛶䛔䜛 • 䝍䝇䜽䛿twiWer䛾䜘䛖䛺䝃䞊䝡䝇䛻䛚䛔䛶䚸䝴䞊 䝄䛜ᥦ♧䛥䜜䛯䛴䛺䛜䜚䛾䝺䝁䝯䞁䝗䜢accept䛩 䜛䛛䛹䛖䛛䜢ண ⤂ㄽᩥ䜘䜚ᘬ⏝
7.
䝺䝡䝳䞊 • ᪂つᛶ䞉⊂ᛶ
: 2 – ᡭἲ⮬య䛿[Chen+ 2013, ICML]䛾MF䛻Gradient boos4ng algorithm䜢㐺ᛂ䛧䛯᪉ἲ䜢FM䛻㐺ᛂ䛧 䛯䛰䛡䛷䛒䜎䜚᪂つᛶ䛿䛺䛔 • ᭷ຠᛶ䞉ᐇ⏝ᛶ㻌: 4 – 䜒䛸䜒䛸䛾FM䛜᭷ຠ䛺ᡭἲ䛷䛒䜚 – ᚑ᮶䛾FM䛷䛿䛷䛝䛺䛛䛳䛯᭷ຠ䛺ḟ䛾㡯䛰䛡 㑅ᢥ䛷䛝䜛䜘䛖䛻䛺䛳䛯䛸䛔䛖Ⅼ䛷ᐇ⏝ⓗ䛸䛔䛘䜛
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