Model-basedFeedbackinthe
LanguageModelingApproachtoInformationRetrieval
ChengxiangZhai
SchoolofComputerScienceCarnegieMellonUniversityPittsburgh,PA15213
ABSTRACT
1.
INTRODUCTION
JohnLafferty
SchoolofComputerScienceCarnegieMellonUniversityPittsburgh,PA15213
2.PREVIOUSFEEDBACKMETHODSIN
THELMFRAMEWORK
3.THEKL-DIVERGENCERETRIEVAL
MODEL
4.
AGENERATIVEMODELOF
FEEDBACKDOCUMENTS
5.DIVERGENCEMINIMIZATIONOVER
FEEDBACKDOCUMENTS
0.80.70.60.50.40.30.20.100
0.2
0.4
baseline-nofbmixture-fbdiv-min-fb
0.80.70.60.50.40.30.20.1
baseline-nofbmixture-fbdiv-min-fb
0.60.81
0
00.20.40.60.81
0.35mixturediv-min0.3no-feedback
0.250.20.150.1
00.20.40.60.810.35mixturediv-min0.3no-feedback0.250.20.150.1
00.20.40.60.81
0.340.320.30.280.260.240.220.20.180.16
0
0.2
0.4
AP-mixAP88--div-minWEB-mixWEB-div-minTREC8-mixTREC8-div-min0.6
0.8
1
9.
REFERENCES