IMU Experiment in IR4QA at NTCIR-8
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1 IMU Experiment in IR4QA at NTCIR-8 Xiangdong Su, Xueliang Yan, Guanglai Gao, Hongxi Wei School of Computer Science Inner Mongolia University Hohhot, China /16/2010 Inner Mongolia University 1
2 Outline Basic Approaches Experiments Conclusion 6/16/2010 Inner Mongolia University 2
3 Basic Approaches Query Formulation Results Combination 6/16/2010 Inner Mongolia University 3
4 Basic Approaches Query Formulation Question classification Weighting Query expansion Results Combination 6/16/2010 Inner Mongolia University 4
5 Classes: BIOGRAPHY, PERSON, etc. Method: KeySring plus a few Rules 6/16/2010 Inner Mongolia University 5
6 KeyString Source: Sina iask and Baidu Zhidao Manully classify them Statistics 6/16/2010 Inner Mongolia University 6
7 KeyString Source: Sina iask and Baidu Zhidao Manully classify them Statistics 6/16/2010 Inner Mongolia University 7
8 Key-String of DATE type questions Key-String:, 6/16/2010 Inner Mongolia University 8
9 Rule Based collision resolution 6/16/2010 Inner Mongolia University 9
10
11 Basic Approaches Query Formulation Question classification Weighting Query expansion Results Combination 6/16/2010 Inner Mongolia University 11
12 #weight( 0 Where 0 will 0 the 1 NTCIR-8 0 conference 0 be 1 hold 0 on?) 6/16/2010 Inner Mongolia University 12
13 Weighting Biography & Definition -> no weighting Relationship -> weighting according to the collection frequency of the two objects in the question. Other types -> increase the weights of the most important two key words.
14 Basic Approaches Query Formulation Question classification Weighting Query expansion Results Combination 6/16/2010 Inner Mongolia University 14
15 Query expansion Vocabulary mismatch between documents and user's query Type specific Query expansion BIOGRAPHY, DEFINITION and EVENT -> Baidu Baike Others -> Wan Fang 6/16/2010 Inner Mongolia University 15
16 Open Category in Baidu Baike entry Open Category 319
17 KeyTerm ty_max Related Search in Wanfang,,,,,, ty_mid ty_min,,,,,, g-,,,,,
18 6/16/2010 Inner Mongolia University 18
19 Basic Approaches Query Formulation Question classification Weighting Query expansion Results Combination 6/16/2010 Inner Mongolia University 19
20 Results Combination Multi-Evidence The more evidence a document get, the higher it ranked.
21 Basic Approaches Query Formulation Results Combination Three Indexes Re-rank 6/16/2010 Inner Mongolia University 21
22 KeyFile-Unigram-Index KeyFile-Word-Index Indri-Word-Index 6/16/2010 Inner Mongolia University 22
23 6/16/2010 Inner Mongolia University 23
24 Basic Approaches Query Formulation Results Combination Three Indexes Re-rank 6/16/2010 Inner Mongolia University 24
25 6/16/2010 Inner Mongolia University 25
26 Re-rank algorithm Description: This algorithm is designed to implement the document re-rank task according to the returned document lists from three indexes mentioned above. (1)score normalize: For each returned document list from above three indexes For each Di in the returned document list Score normalize(di); (2)compute score: For each Di appeared in one of the returned document list Score interpolating(di); (3)sort documents: Sort(score list);
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28 Outline Basic Approaches Experiments Conclusion 6/16/2010 Inner Mongolia University 28
29 Experimental Setting Lemur Toolkit Tf-Idf Pseudo Relevance Feedback Indri Search Engine Language model and Inference Network Pseudo Relevance Feedback ICTCLAS Hailiang API ( 6/16/2010 Inner Mongolia University 29
30 Experiment Results 6/16/2010 Inner Mongolia University 30
31 Expansion Performance comparison between results with and without Open Category expansion in the training experiments with the NTCIR-7 IR4QA CS test collection Expansion Indri Word Query MAP Q-measure ndcg No Yes Legend: No represents result without expansion, Yes represents result with expansion
32 Results Combination Performance of single index and their combination in the CS-CS training experiments with the NTCIR-7 IR4QA CS test collection Result CS-CS Measure AP Q-measure ndcg KeyFile-Unigram-Index KeyFile-Word-Index Indri-Word-Inde + means the combination of them
33 Classification Result Type BIOGRAPHY PERSON EVENT Number Type ORGANIZATION LOCATION DATE Number Type RELATIONSHIP DEFINITION WHY Number Accuracy of question classification is /16/2010 Inner Mongolia University 33
34 Mean AP of Each Class Type BIOGRAPHY PERSON EVENT Number Type ORGANIZATION LOCATION DATE Number Type RELATIONSHIP DEFINITION WHY Number /16/2010 Inner Mongolia University 34
35 Mean AP comparison of each question types ORGANIZATION>EVENT>RELATIONSHIP> BIOGRAPHY>PERSON>LOCATION>DATE> DEFINITION>WHY 6/16/2010 Inner Mongolia University 35
36 Our formal runs Official Runs with Combination Parameters Measure IMU-CS-CS- 01-T IMU-CS-CS- 02-T IMU-CS-CS- 03-T IMU-EN-CS- 01-T mean AP mean Q mean ndcg
37 Conclusion Query Formulation Results Combination 6/16/2010 Inner Mongolia University 37
38 Thanks! Comments & Questions? School Of Computer Science Inner Mongolia University Hohhot, Inner Mongolia Autonomous Region, China Tel: /16/2010 Inner Mongolia University 38
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