Word sense disambiguation (1) Notes | EduRev

: Word sense disambiguation (1) Notes | EduRev

 Page 1


Word sense disambiguation 
(1) 
 
 
 
Instructor: Rada Mihalcea 
Note: Some of the material in this slide set was adapted from a tutorial given by 
Rada Mihalcea & Ted Pedersen at ACL 2005 
Page 2


Word sense disambiguation 
(1) 
 
 
 
Instructor: Rada Mihalcea 
Note: Some of the material in this slide set was adapted from a tutorial given by 
Rada Mihalcea & Ted Pedersen at ACL 2005 
 Slide 1 
Definitions 
Word sense disambiguation is the problem of selecting a sense for a 
word from a set of predefined possibilities.  
Sense Inventory usually comes from a dictionary or thesaurus. 
Knowledge intensive methods, supervised learning, and (sometimes) 
bootstrapping approaches  
 
Word sense discrimination is the problem of dividing the usages of a 
word into different meanings, without regard to any particular 
existing sense inventory. 
Unsupervised techniques  
 
Page 3


Word sense disambiguation 
(1) 
 
 
 
Instructor: Rada Mihalcea 
Note: Some of the material in this slide set was adapted from a tutorial given by 
Rada Mihalcea & Ted Pedersen at ACL 2005 
 Slide 1 
Definitions 
Word sense disambiguation is the problem of selecting a sense for a 
word from a set of predefined possibilities.  
Sense Inventory usually comes from a dictionary or thesaurus. 
Knowledge intensive methods, supervised learning, and (sometimes) 
bootstrapping approaches  
 
Word sense discrimination is the problem of dividing the usages of a 
word into different meanings, without regard to any particular 
existing sense inventory. 
Unsupervised techniques  
 
 Slide 2 
Computers versus Humans 
Polysemy – most words have many possible meanings. 
A computer program has no basis for knowing which one is 
appropriate, even if it is obvious to a human… 
Ambiguity is rarely a problem for humans in their day to day 
communication, except in extreme cases… 
 
 
Page 4


Word sense disambiguation 
(1) 
 
 
 
Instructor: Rada Mihalcea 
Note: Some of the material in this slide set was adapted from a tutorial given by 
Rada Mihalcea & Ted Pedersen at ACL 2005 
 Slide 1 
Definitions 
Word sense disambiguation is the problem of selecting a sense for a 
word from a set of predefined possibilities.  
Sense Inventory usually comes from a dictionary or thesaurus. 
Knowledge intensive methods, supervised learning, and (sometimes) 
bootstrapping approaches  
 
Word sense discrimination is the problem of dividing the usages of a 
word into different meanings, without regard to any particular 
existing sense inventory. 
Unsupervised techniques  
 
 Slide 2 
Computers versus Humans 
Polysemy – most words have many possible meanings. 
A computer program has no basis for knowing which one is 
appropriate, even if it is obvious to a human… 
Ambiguity is rarely a problem for humans in their day to day 
communication, except in extreme cases… 
 
 
 Slide 3 
Ambiguity for Humans - Newspaper 
Headlines! 
DRUNK GETS NINE YEARS IN VIOLIN CASE 
FARMER BILL DIES IN HOUSE  
PROSTITUTES APPEAL TO POPE  
STOLEN PAINTING FOUND BY TREE  
RED TAPE HOLDS UP NEW BRIDGE 
DEER KILL 300,000 
RESIDENTS CAN DROP OFF TREES 
INCLUDE CHILDREN WHEN BAKING COOKIES  
MINERS REFUSE TO WORK AFTER DEATH  
 
Page 5


Word sense disambiguation 
(1) 
 
 
 
Instructor: Rada Mihalcea 
Note: Some of the material in this slide set was adapted from a tutorial given by 
Rada Mihalcea & Ted Pedersen at ACL 2005 
 Slide 1 
Definitions 
Word sense disambiguation is the problem of selecting a sense for a 
word from a set of predefined possibilities.  
Sense Inventory usually comes from a dictionary or thesaurus. 
Knowledge intensive methods, supervised learning, and (sometimes) 
bootstrapping approaches  
 
Word sense discrimination is the problem of dividing the usages of a 
word into different meanings, without regard to any particular 
existing sense inventory. 
Unsupervised techniques  
 
 Slide 2 
Computers versus Humans 
Polysemy – most words have many possible meanings. 
A computer program has no basis for knowing which one is 
appropriate, even if it is obvious to a human… 
Ambiguity is rarely a problem for humans in their day to day 
communication, except in extreme cases… 
 
 
 Slide 3 
Ambiguity for Humans - Newspaper 
Headlines! 
DRUNK GETS NINE YEARS IN VIOLIN CASE 
FARMER BILL DIES IN HOUSE  
PROSTITUTES APPEAL TO POPE  
STOLEN PAINTING FOUND BY TREE  
RED TAPE HOLDS UP NEW BRIDGE 
DEER KILL 300,000 
RESIDENTS CAN DROP OFF TREES 
INCLUDE CHILDREN WHEN BAKING COOKIES  
MINERS REFUSE TO WORK AFTER DEATH  
 
 Slide 4 
Ambiguity for a Computer 
The fisherman jumped off the bank and into the water. 
The bank down the street was robbed! 
Back in the day, we had an entire bank of computers devoted to this 
problem.  
The bank in that road is entirely too steep and is really dangerous.  
The plane took a bank to the left, and then headed off towards the 
mountains.  
 
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