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A language modeling framework for expert finding
1.
A language model
framework for expert finding Written by Krisztian Balog, Leif Azzopardi, Maarten de Rijke Presented by Saúl Vargas Sandoval
2.
3.
Language modeling: the
basics
4.
5.
Candidate model
6.
Document model
7.
8.
9.
Questions
10.
11.
12.
13.
14.
E-mail
15.
database records
16.
Agendas
17.
Memos
18.
Logs
19.
Blogs
20.
Address books
21.
...
22.
23.
24.
Query q ->
probability of the document model generating the query q:
25.
26.
Bayes' Theorem and
simplifying assumption:
27.
The expert finding
task: models Candidate model Document model Documents Candidates Query Result Query Ranked documents Candidates Result
28.
29.
Smoothing:
30.
31.
Let's do the
math!
32.
33.
First estimation:
34.
35.
Second estimation:
36.
37.
Association between the
documents and the candidate.
38.
Assuming independence:
39.
40.
First estimation:
41.
42.
Second estimation:
43.
44.
Boolean model:
45.
Frenquency-based approach: TF.IDF
46.
47.
For each model:
independece assumption or windows? Which window size?
48.
Document-candidate association: boolean
model or frequency-based approach?
49.
50.
51.
Each person described
in documents with name, e-mail, ID number, abreviations...
52.
53.
Mean reciprocal rank
(MRR):
54.
Candidate model vs.
Document model Model MAP MRR 2005 2006 2005 2006 Candidate 1st 0.1883 0.3206 0.4692 0.7264 Document 1st 0.2503 0.4660 0.6088 0.9354
55.
Window sizes Model
MAP MRR 2005 2006 2005 2006 Candidate 2nd 25 100 15 15 Document 2nd 125 250 15 75
56.
Conditional independence vs.
Windows (I) Model MAP MRR 2005 2006 2005 2006 Candidate 1st 0.1883 0.3206 0.4692 0.7264 Candidate 2nd 0.2020 0.4254 0.5928 0.9048 Document 1st 0.2053 0.4660 0.6088 0.9354 Document 2nd 0.2194 0.4544 0.6096 0.9235 Window sizes optimized for MAP
57.
Conditional independence vs.
Windows (II) Model MAP MRR 2005 2006 2005 2006 Candidate 1st 0.1883 0.3206 0.4692 0.7264 Candidate 2nd 0.2012 0.3848 0.6275 0.9558 Document 1st 0.2053 0.4660 0.6088 0.9354 Document 2nd 0.1964 0.4463 0.6371 0.9531 Window sizes optimized for MRR
58.
Conditional independence vs.
Windows (III)
59.
Document-candidate association methods
(I)
60.
Conclusions DOCUMENT MODEL
(with conditional independence!)
61.
62.
Thanks! Danke!