a distributional semantics approach for selective reasoning on commonsense graph knowledge bases
DESCRIPTION
Tasks such as question answering and semantic search are dependent on the ability of querying & reasoning over large-scale commonsense knowledge bases (KBs). However, dealing with commonsense data demands coping with problems such as the increase in schema complexity, semantic inconsistency, incompleteness and scalability. This paper proposes a selective graph navigation mechanism based on a distributional relational semantic model which can be applied to querying & reasoning over heterogeneous knowledge bases (KBs). The approach can be used for approximative reasoning, querying and associational knowledge discovery. In this paper we focus on commonsense reasoning as the main motivational scenario for the approach. The approach focuses on addressing the following problems: (i) providing a semantic selection mechanism for facts which are relevant and meaningful in a specific reasoning & querying context and (ii) allowing coping with information incompleteness in large KBs. The approach is evaluated using ConceptNet as a commonsense KB, and achieved high selectivity, high scalability and high accuracy in the selection of meaningful nav- igational paths. Distributional semantics is also used as a principled mechanism to cope with information incompleteness.TRANSCRIPT
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A Distributional Semantics Approach for Selective Reasoning on
Commonsense Graph Knowledge Bases
André Freitas, João C. Pereira Da Silva, Edward Curry, Paul Buitelaar Insight Centre for Data Analytics
NLDB 2014Montpellier, France
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Applying Distributional Semantics to Commonsense Reasoning
André Freitas, João C. Pereira Da Silva, Edward Curry, Paul Buitelaar Insight Centre for Data Analytics
NLDB 2014Montpellier, France
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Outline
Motivation Distributional Semantics Distributional Navigational Algorithm (DNA) Evaluation Take-away message
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Motivation4
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Semantic Systems & Commonsense Knowledge Bases
Knowledge Representation Model
Commonsense Data
Expected Result: Intelligent behavior
Semantic flexibility, predictive power, automation ...
Acquisition
Inference Model Scalability
Consistency
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Formal Representation of Meaning
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Most semantic models have dealt with particular types of constructions, and have been carried out under very simplifying assumptions, in true lab conditions.
If these idealizations are removed it is not clear at all that modern semantics can give a full account of all but the simplest models/statements.
Formal World Real World
Baroni et al. 2013
Semantics for a Complex World
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Commonsense Reasoning
Coping with KB incompleteness- Supporting semantic approximation
Selective reasoning- Selecting the relevant facts in the context of the inference
Acquisition
Scalability
Strategy: Using distributional semantics to solve both the acquisition and scalability problems
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Example
Does John Smith have a degree?
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Example
Does John Smith have a degree?
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Example
Does John Smith have a degree?
Selective reasoning
Coping with KB Incompleteness
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Applications Semantic search Question answering Approximate semantic inference Word sense disambiguation Paraphrase detection Text entailment Semantic anomaly detection
...
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Distributional Semantics
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Distributional Hypothesis
“Words occurring in similar (linguistic) contexts tend to be semantically similar”
He filled the wampimuk with the substance, passed it around and we all drunk some
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Distributional Semantic Models (DSMs)
car
dog
cat
bark
run
leash
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Context
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Semantic Similarity & Relatedness
θ
car
dog
cat
bark
run
leash
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DSMs as Commonsense Reasoning
Commonsense is here
θ
car
dog
cat
bark
run
leash
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DSMs as Commonsense Reasoning
θ
car
dog
cat
bark
run
leash
...
vs.
Semantic best-effort
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Distributional Navigational Algorithm (DNA)
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Approach OverviewDistributional Navigational
Algorithm (DNA)
Ƭ-Space
Large-scale unstructured data
Unstructured Commonsense KB
Structured Commonsense KB
Distributional semantics
Reasoning Context
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Ƭ-Space
Distributional heuristics
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Distributional semantic relatedness as a Selectivity Heuristics
Distributional heuristics
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target
source
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Distributional heuristics
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Distributional semantic relatedness as a Selectivity Heuristics
target
source
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Distributional heuristics
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Distributional semantic relatedness as a Selectivity Heuristics
target
target
source
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Distributional Navigational Algorithm (DNA)Input:
Reasoning context: Source and target word pairsStructured Knowledge Base (KB)Distributional Semantic Model (DSM)
Output:Meaningful paths in the KB connecting source and target
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Distributional Navigational Algorithm (DNA)
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
John Smith
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Step: Resoning context = <John Smith, degree>
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
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occupation
Step: Get neighboring relations
engineer
John SmithJohn
Smith
catholic
religion
...
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
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Step: Calculate the distributional semantic relatedness between the target term and the neighboring entities
John SmithJohn
Smith
catholicoccupation
engineer
religion
...
sem rel (catholic, degree) = 0.004
sem rel (engineer, degree) = 0.07
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
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John SmithJohn
Smith
catholicoccupation
engineer
religion
...
sem rel (catholic, degree) = 0.004
sem rel (engineer, degree) = 0.01
Step: Filter the elements below the threshold
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
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John SmithJohn
Smith
occupation
engineer
Step: Navigate to the next nodes
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
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John SmithJohn
Smith
occupation
engineer
Step: redefine the reasoning context: <engineer, degree>
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
Step: Get neighboring relations
John Smith
engineer learnsubjectof
bridge a rivercapableof
dam
creates
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occupation
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
sem rel (dam, degree) = 0.002
Step: Calculate distributional semantic relatedness between the target term and the neighboring entities
sem rel (brdge a river, degree) = 0.004
sem rel (learn, degree) = 0.01
John Smith
engineer learnsubjectof
bridge a rivercapableof
dam
creates
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occupation
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
sem rel (dam, degree) = 0.002
Step: Filter the elements below the threshold
sem rel (brdge a river, degree) = 0.004
sem rel (learn, degree) = 0.01
John Smith
engineer learnsubjectof
bridge a rivercapableof
dam
creates
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occupation
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
Step: Search highly related entities in the KB not connected(distributional semantics)
John Smith
engineer learnsubjectof
Reasoning context: ‘learn degree’
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occupation
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
Step: Navigate to the elements above the threshold
John Smith
engineer learnsubjectof
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occupation
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
Step: Repeat the steps
John Smith
engineer learnsubjectof
education
have or involve
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occupation
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
Step: Repeat the steps
John Smith
engineer learnsubjectof
education
have or involve
at location
university
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occupation
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Distributional Navigational Algorithm (DNA)
Does John Smith have a degree?
StructuredCommonsense KB
Distributional Commonsense KB
Step: Search highly related entities in the KB not connected(distributional semantics)
John Smith
engineer learnsubjectof
education
have or involve
at location
university
Reasoning context: ‘university degree’
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occupation
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Distributional Navigational Algorithm (DNA)
StructuredCommonsense KB
Distributional Commonsense KB
John Smith
engineer learnsubjectof
education
have or involve
at location
universitycollege
Does John Smith have a degree?
Step: Search highly related entities in the KB not connected(distributional semantics)
Reasoning context: ‘university degree’
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occupation
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Distributional Navigational Algorithm (DNA)
StructuredCommonsense KB
Distributional Commonsense KB
John Smith
engineer learnsubjectof
education
have or involve
at location
universitycollege
Does John Smith have a degree?
Step: Repeat the steps
degreegives
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occupation
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Examples of Selected PathsReasoning context: < battle, war >
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Examples of Selected Paths
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Improving the DNA Algorithm: Semantic Differential Δ
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Closer to the target
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Evaluation48
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Evaluating Semantic SelectivityHow does the semantic selectivity scale with the increase in the number of candidate paths?
How does the accuracy of the semantic selectivity scale with the increase in the number of candidate paths?
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Experimental Setup Query set: 102 word pairs (derived from
Question Answering over Linked Data queries 2011/2012)
E.g.
- What is the highest mountain? - Mount Everest elevation 8848.0
Distributional Semantic Model: ESA Threshold: η = 0.05 Dataset: ConceptNet Gold standard: Manual validation with two
independent annotators
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ConceptNet Number of clauses x per relation type:
x = 1 (45,311)1 < x < 10 (11,804)10 <= x < 20 (906)20<= x < 500 (790)
x >= 500 (50)
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Semantic Selectivity
total number of paths (path length n)
number of paths selectedselectivity =
The semantic selectivity for the DNA approach scales with the increasing in the number of candidate paths
How does the semantic selectivity scale with the increase in the number of candidate paths?
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Semantic Relevance
number of returned pathsnumber of relevant pathsaccuracy =
What is the semantic relevance of the returned paths?
How does the accuracy of the semantic selectivity scale with the increase in the number of candidate paths?
There is a significant reduction in the accuracy with the increase in the number of paths. However the accuracy value remains high.
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Evaluating Semantic Incompleteness
How does distributional semantics support increasing the KB completeness?
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Incompleteness 39 <source, target> query pairs Over all ConceptNet entities Example:
- Query: < mayor, city >- Returned entities:
councilmunicipalitydowntownwardincumbentborough reelectedmetropolitanelectcandidatepoliticiandemocratic
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Incompleteness
Avg. KB completion precision = 0.568 Avg. # of strongly related entities returned per query =
19.21
number of retrieved entitiesnumber of strongly related entitiesKB completion precision
=
How does distributional semantics support increasing the KB completeness?
Distributional semantics supports improving the completeness of the KB
However, further investigation is necessary to improve the precision of distributional models
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Take-away message Distributional Semantics provides in the selection
of meaningful paths:
- high selectivity- high selectivity scalability- medium-high accuracy
Distributional semantics supports improving the completeness of the KB
- However, further investigation is necessary to improve the precision of distributional models in this context
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EasyESA: Do-it-yourself
http://treo.deri.ie/easyesa/
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