facebook graph search with cypher and neo4j
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Facebook Graph Search with Neo4j
Max De Marzi
Monday, April 29, 13
Can I Haz?Monday, April 29, 13
NopeMonday, April 29, 13
#9,998,383,750,000
Monday, April 29, 13
Can I make my own?
Monday, April 29, 13
MaybeMonday, April 29, 13
What do I know about
NLP?Monday, April 29, 13
NothingMonday, April 29, 13
What do I know?
Monday, April 29, 13
Monday, April 29, 13
andMonday, April 29, 13
CypherMonday, April 29, 13
I can query a graph
Monday, April 29, 13
How?Monday, April 29, 13
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Matching PatternsMonday, April 29, 13
ASCII Art
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() --> ()
ASCII Art
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Named Nodes
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(A) --> (B)
Named Nodes
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LOVES
Typed Relationships
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A -[:LOVES]-> B
LOVES
Typed Relationships
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Describing a Path
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A --> B --> C
Describing a Path
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A
B C
Multiple Paths
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A --> B --> C, A --> C
A
B C
Multiple Paths
Monday, April 29, 13
A --> B --> C, A --> C
A
B C
A --> B --> C <-- A
Multiple Paths
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The START Clause
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The START Clause
START me=node(1)RETURN me
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with an Index
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with an Index
START me=node:Users(name=‘Max’)RETURN me
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The MATCH Clause
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The MATCH Clause
START me=node:Users(name=‘Max’)MATCH me -[:friends]-> peopleRETURN people
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My friends who like cheese
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My friends who like cheese
START me=node:Users(name=‘Max’) thing=node:Things(name=‘Cheese’)MATCH me -[:friends]-> people -[:like]-> thingRETURN people
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My friends who like cheese
Monday, April 29, 13
My friends who like cheese
START me=node:Users(name=‘Max’) thing=node:Things(name=‘Cheese’)MATCH me -[:friends]-> people, people -[:like]-> thingRETURN people
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My friends who like ?
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My friends who like ?START me=node({me}), thing=node:Things({thing})MATCH me -[:friends]-> people, people -[:like]-> thingRETURN people
Params :{“me”: 1, “thing”: “name: cheese”}
Monday, April 29, 13
My friends who like ? and ?
Monday, April 29, 13
My friends who like ? and ?
START me=node({me}), thing1=node:Things({thing1}), thing2=node:Things({thing2})MATCH me -[:friends]-> people, people -[:like]-> thing1, people -[:like]-> thing2RETURN peopleParams :{“me”: 1, “thing1”: “name: cheese”, “thing2”: “name: wine”}
Monday, April 29, 13
I need to build a Cypher Query
Monday, April 29, 13
SEMR
✦ Gateway drug to NLP
✦ 4 years old
✦ Didn’t work on my Mac
✦ Pointed me to Treetop
Monday, April 29, 13
Treetop✦ Create a Grammar by
making some Rules
✦ Turn expression into Syntax Tree
✦ Build custom Syntax Nodes
✦ Prune the tree
✦ to_cypher
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Friends Rule
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Friends Rule
rule friends “friends” <Friends>end
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friends to_cypher
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friends to_cypher class Friends < Treetop::Runtime::SyntaxNode
def to_cypher
return {:start => "me = node({me})",
:match => "me -[:friends]-> people",
:return => "people",
:params => {"me" => nil }}
end
end
Monday, April 29, 13
Likes Rule
Monday, April 29, 13
Likes Rule
rule likes "who like" <Likes>end
Monday, April 29, 13
likes to_cypher
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likes to_cypher class Likes < Treetop::Runtime::SyntaxNode
def to_cypher
return {:match => "people -[:likes]-> thing"}
end
end
Monday, April 29, 13
Thing Rule
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Thing Rule
rule thing [a-zA-Z0-9]+ <Thing>end
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thing to_cypher
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thing to_cypherclass Thing < Treetop::Runtime::SyntaxNode
def to_cypher
return {:start => "thing = node:things({thing})",
:params => {"thing" => "name: " + self.text_value } }
end
end
Monday, April 29, 13
Show and Tellhttps://github.com/maxdemarzi/neo_graph_search
http://maxdemarzi.com/2013/01/28/facebook-graph-search-with-cypher-and-neo4j/
Monday, April 29, 13
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