JobRecommendationwithHawkesProcess

W.Xiao,X.Xu,K.Liang,J.Mao,andJ.WangOneSearch Team,Alibaba Group

Boston,MA,USASep.15,2016

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B ! C

• RecSys2015(Vienna)• TheSecondPlace

• KDD Cup2016 (San Francisco)• The Second Place(Phase1)

Boston• RecSys2016• TheFirstPlace

Wenming Xiao XiaoXu

KangLiang JunkangMao JunWang

B .D D D . DD

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B .D D D

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NAM LMKBEHE C

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F B B G B

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B B - B G BØ : REOD MEKPN IK AHN OK NKM E AMNA E BKMI OEKØ - NAI HA / ,: REOD ODA E LPO BMKI E EOE H M GE CØ 0 RGAN MK ANN NAHB AS EOE C OK LOPMA OAILKM H L OOAM N

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7 days

14 days

21 days

28 days

3 days

2

1

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ratio:ui/u,ui/i

trend:iteminteractioncounts

similarity(interaction&profiling):u2u,i2i,u2i

poi:item,userinteraction

user&itemprofile:0/1 user/item/uiinteractionstatistics:(timewindow)0/1,count,distinctcount,days……

conditionalprobability:impressiontointeraction,interactiontointeraction

LowLevel

HighLevel

user: lastdayifclick/impitem: lastdayclickcountsuser-item: userclickcountsfortheiteminlastweek

itemimpressiontrenditemearliest andlastinteractiontime

……

B D - G D

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TrainData

TrainModel

28 days 5 days

28 days 6 days

28 days 7 days

28 days 8 days

Stage 1

LR

XGBOOST

GBRT

GBDT

Pass

Reject

Stage 2

GBDT

GBDT

GBDT

……

Ensemble Top NOutput

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A B D C DI G D G C B CC

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Ø 0KIKCA KPN LKE O LMK ANN

User-itemeventModel,Du,etal.2015

baselineintensity

temporaldependency

user-itemevent

G - G C B CC

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baselineintensitymatrix

selfexcitingmatrix

exponentialform

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