Slide 1
Patterns Are Everywhere
Two Methods of Pattern
Matching
Hard Matching
Soft Matching (Cui et
al., 2004)
Weakness of Current Soft
Matching Models
In This Paper …
Outline
Outline
Definitional QA
Pattern Matching for
Definitional QA
Outline
Bigram Soft Pattern Model
Bigram Model in Dealing
with Gaps
Outline
PHMM Soft Pattern Model
How PHMM Deals with Gaps
Estimation of PHMM
Outline
Evaluation Setup
Evaluation Metrics
Performance Evaluation
Sensitivity to Model
Length
Sensitivity to the Amount
of Training Data
Discussions on Both
Models
Outline
Conclusions
Q & A