Closeness Centrality
This feature is in the beta tier. For more information on feature tiers, see API Tiers.
Glossary
 Directed

Directed trait. The algorithm is welldefined on a directed graph.
 Undirected

Undirected trait. The algorithm is welldefined on an undirected graph.
 Homogeneous

Homogeneous trait. The algorithm will treat all nodes and relationships in its input graph(s) similarly, as if they were all of the same type. If multiple types of nodes or relationships exist in the graph, this must be taken into account when analysing the results of the algorithm.
 Heterogeneous

Heterogeneous trait. The algorithm has the ability to distinguish between nodes and/or relationships of different types.
 Weighted

Weighted trait. The algorithm supports configuration to set node and/or relationship properties to use as weights. These values can represent cost, time, capacity or some other domainspecific properties, specified via the nodeWeightProperty, nodeProperties and relationshipWeightProperty configuration parameters. The algorithm will by default consider each node and/or relationship as equally important.
1. Introduction
Closeness centrality is a way of detecting nodes that are able to spread information very efficiently through a graph.
The closeness centrality of a node measures its average farness (inverse distance) to all other nodes. Nodes with a high closeness score have the shortest distances to all other nodes.
For each node u, the Closeness Centrality algorithm calculates the sum of its distances to all other nodes, based on calculating the shortest paths between all pairs of nodes. The resulting sum is then inverted to determine the closeness centrality score for that node.
The raw closeness centrality of a node u is calculated using the following formula:
raw closeness centrality(u) = 1 / sum(distance from u to all other nodes)
It is more common to normalize this score so that it represents the average length of the shortest paths rather than their sum. This adjustment allow comparisons of the closeness centrality of nodes of graphs of different sizes
The formula for normalized closeness centrality of node u is as follows:
normalized closeness centrality(u) = (number of nodes  1) / sum(distance from u to all other nodes)
Wasserman and Faust have proposed an improved formula for dealing with unconnected graphs. Assuming that n is the number of nodes reachable from u (counting also itself), their corrected formula for a given node u is given as follows:
WassermanFaust normalized closeness centrality(u) = (n1)^2/ number of nodes  1) * sum(distance from u to all other nodes
Note that in the case of a directed graph, closeness centrality is defined alternatively. That is, rather than considering distances from u to every other node, we instead sum and average the distance from every other node to u.
1.1. Usecases  when to use the Closeness Centrality algorithm

Closeness centrality is used to research organizational networks, where individuals with high closeness centrality are in a favourable position to control and acquire vital information and resources within the organization. One such study is "Mapping Networks of Terrorist Cells" by Valdis E. Krebs.

Closeness centrality can be interpreted as an estimated time of arrival of information flowing through telecommunications or package delivery networks where information flows through shortest paths to a predefined target. It can also be used in networks where information spreads through all shortest paths simultaneously, such as infection spreading through a social network. Find more details in "Centrality and network flow" by Stephen P. Borgatti.

Closeness centrality has been used to estimate the importance of words in a document, based on a graphbased keyphrase extraction process. This process is described by Florian Boudin in "A Comparison of Centrality Measures for GraphBased Keyphrase Extraction".
1.2. Constraints  when not to use the Closeness Centrality algorithm

Academically, closeness centrality works best on connected graphs. If we use the original formula on an unconnected graph, we can end up with an infinite distance between two nodes in separate connected components. This means that we’ll end up with an infinite closeness centrality score when we sum up all the distances from that node.
In practice, a variation on the original formula is used so that we don’t run into these issues.
2. Syntax
This section covers the syntax used to execute the Closeness Centrality algorithm in each of its execution modes. We are describing the named graph variant of the syntax. To learn more about general syntax variants, see Syntax overview.
CALL gds.beta.closeness.stream(
graphName: String,
configuration: Map
)
YIELD
nodeId: Integer,
score: Float
Name  Type  Default  Optional  Description 

graphName 
String 

no 
The name of a graph stored in the catalog. 
configuration 
Map 

yes 
Configuration for algorithmspecifics and/or graph filtering. 
Name  Type  Default  Optional  Description 

List of String 

yes 
Filter the named graph using the given node labels. 

List of String 

yes 
Filter the named graph using the given relationship types. 

Integer 

yes 
The number of concurrent threads used for running the algorithm. 

String 

yes 
An ID that can be provided to more easily track the algorithm’s progress. 

Boolean 

yes 
If disabled the progress percentage will not be logged. 

useWassermanFaust 
Boolean 

yes 
Use the improved WassermanFaust formula for closeness computation. 
Name  Type  Description 

nodeId 
Integer 
Node ID. 
score 
Float 
Closeness centrality score. 
CALL gds.beta.closeness.stats(
graphName: String,
configuration: Map
)
YIELD
centralityDistribution: Map,
computeMillis: Integer,
postProcessingMillis: Integer,
preProcessingMillis: Integer,
configuration: Map
Name  Type  Default  Optional  Description 

graphName 
String 

no 
The name of a graph stored in the catalog. 
configuration 
Map 

yes 
Configuration for algorithmspecifics and/or graph filtering. 
Name  Type  Default  Optional  Description 

List of String 

yes 
Filter the named graph using the given node labels. 

List of String 

yes 
Filter the named graph using the given relationship types. 

Integer 

yes 
The number of concurrent threads used for running the algorithm. 

String 

yes 
An ID that can be provided to more easily track the algorithm’s progress. 

Boolean 

yes 
If disabled the progress percentage will not be logged. 

useWassermanFaust 
Boolean 

yes 
Use the improved WassermanFaust formula for closeness computation. 
Name  Type  Description 

centralityDistribution 
Map 
Map containing min, max, mean as well as p50, p75, p90, p95, p99 and p999 percentile values of centrality values. 
preProcessingMillis 
Integer 
Milliseconds for preprocessing the graph. 
computeMillis 
Integer 
Milliseconds for running the algorithm. 
postProcessingMillis 
Integer 
Milliseconds for computing the statistics. 
configuration 
Map 
Configuration used for running the algorithm. 
CALL gds.beta.closeness.mutate(
graphName: String,
configuration: Map
)
YIELD
nodePropertiesWritten: Integer,
preProcessingMillis: Integer,
computeMillis: Integer,
postProcessingMillis: Integer,
mutateMillis: Integer,
mutateProperty: String,
centralityDistribution: Map,
configuration: Map
Name  Type  Default  Optional  Description 

graphName 
String 

no 
The name of a graph stored in the catalog. 
configuration 
Map 

yes 
Configuration for algorithmspecifics and/or graph filtering. 
Name  Type  Default  Optional  Description 

mutateProperty 
String 

no 
The node property in the GDS graph to which the centrality is written. 
List of String 

yes 
Filter the named graph using the given node labels. 

List of String 

yes 
Filter the named graph using the given relationship types. 

Integer 

yes 
The number of concurrent threads used for running the algorithm. 

String 

yes 
An ID that can be provided to more easily track the algorithm’s progress. 

useWassermanFaust 
Boolean 

yes 
Use the improved WassermanFaust formula for closeness computation. 
Name  Type  Description 

nodePropertiesWritten 
Integer 
Number of properties added to the inmemory graph. 
preProcessingMillis 
Integer 
Milliseconds for preprocessing the graph. 
computeMillis 
Integer 
Milliseconds for running the algorithm. 
postProcessingMillis 
Integer 
Milliseconds for computing the statistics. 
mutateMillis 
Integer 
Milliseconds for mutating the GDS graph. 
mutateProperty 
String 
The node property updated in the GDS graph. 
centralityDistribution 
Map 
Map containing min, max, mean as well as p50, p75, p90, p95, p99 and p999 percentile values of centrality values. 
configuration 
Map 
Configuration used for running the algorithm. 
CALL gds.beta.closeness.write(
graphName: String,
configuration: Map
)
YIELD
nodePropertiesWritten: Integer,
preProcessingMillis: Integer,
computeMillis: Integer,
postProcessingMillis: Integer,
writeMillis: Integer,
writeProperty: String,
centralityDistribution: Map,
configuration: Map
Name  Type  Default  Optional  Description 

graphName 
String 

no 
The name of a graph stored in the catalog. 
configuration 
Map 

yes 
Configuration for algorithmspecifics and/or graph filtering. 
Name  Type  Default  Optional  Description 

List of String 

yes 
Filter the named graph using the given node labels. 

List of String 

yes 
Filter the named graph using the given relationship types. 

Integer 

yes 
The number of concurrent threads used for running the algorithm. 

String 

yes 
An ID that can be provided to more easily track the algorithm’s progress. 

Boolean 

yes 
If disabled the progress percentage will not be logged. 

Integer 

yes 
The number of concurrent threads used for writing the result to Neo4j. 

String 

no 
The node property in the Neo4j database to which the centrality is written. 

useWassermanFaust 
Boolean 

yes 
Use the improved WassermanFaust formula for closeness computation. 
Name  Type  Description 

nodePropertiesWritten 
Integer 
Number of properties written to Neo4j. 
preProcessingMillis 
Integer 
Milliseconds for preprocessing the graph. 
computeMillis 
Integer 
Milliseconds for running the algorithm. 
postProcessingMillis 
Integer 
Milliseconds for computing the statistics. 
writeMillis 
Integer 
Milliseconds for mutating the GDS graph. 
writeProperty 
String 
The node property updated in the GDS graph. 
centralityDistribution 
Map 
Map containing min, max, mean as well as p50, p75, p90, p95, p99 and p999 percentile values of centrality values. 
configuration 
Map 
Configuration used for running the algorithm. 
3. Examples
In this section we will show examples of running the Closeness Centrality algorithm on a concrete graph. The intention is to illustrate what the results look like and to provide a guide in how to make use of the algorithm in a real setting. We will do this on a small sample graph of a handful nodes connected in a particular pattern. The example graph looks like this:
CREATE (a:Node {id:"A"}),
(b:Node {id:"B"}),
(c:Node {id:"C"}),
(d:Node {id:"D"}),
(e:Node {id:"E"}),
(a)[:LINK]>(b),
(b)[:LINK]>(a),
(b)[:LINK]>(c),
(c)[:LINK]>(b),
(c)[:LINK]>(d),
(d)[:LINK]>(c),
(d)[:LINK]>(e),
(e)[:LINK]>(d);
With the graph in Neo4j we can now project it into the graph catalog to prepare it for algorithm execution.
We do this using a native projection targeting the Node
nodes and the LINK
relationships.
In the examples below we will use named graphs and native projections as the norm. However, Cypher projections can also be used. 
CALL gds.graph.project('myGraph', 'Node', 'LINK')
In the following examples we will demonstrate using the Closeness Centrality algorithm on this graph.
3.1. Stream
In the stream
execution mode, the algorithm returns the centrality for each node.
This allows us to inspect the results directly or postprocess them in Cypher without any side effects.
For example, we can order the results to find the nodes with the highest closeness centrality.
For more details on the stream
mode in general, see Stream.
stream
mode:CALL gds.beta.closeness.stream('myGraph')
YIELD nodeId, score
RETURN gds.util.asNode(nodeId).id AS id, score
ORDER BY score DESC
id  score 

"C" 
0.6666666666666666 
"B" 
0.5714285714285714 
"D" 
0.5714285714285714 
"A" 
0.4 
"E" 
0.4 
C is the best connected node in this graph, although B and D aren’t far behind. A and E don’t have close ties to many other nodes, so their scores are lower. Any node that has a direct connection to all other nodes would score 1.
3.2. Stats
In the stats
execution mode, the algorithm returns a single row containing a summary of the algorithm result.
This execution mode does not have any side effects.
It can be useful for evaluating algorithm performance by inspecting the computeMillis
return item.
In the examples below we will omit returning the timings.
The full signature of the procedure can be found in the syntax section.
For more details on the stats
mode in general, see Stats.
stats
mode:CALL gds.beta.closeness.stats('myGraph')
YIELD centralityDistribution
RETURN centralityDistribution.min AS minimumScore, centralityDistribution.mean AS meanScore
minimumScore  meanScore 

0.399999618530273 
0.521904373168945 
3.3. Mutate
The mutate
execution mode extends the stats
mode with an important side effect: updating the named graph with a new node property containing the centrality for that node.
The name of the new property is specified using the mandatory configuration parameter mutateProperty
.
The result is a single summary row, similar to stats
, but with some additional metrics.
The mutate
mode is especially useful when multiple algorithms are used in conjunction.
For more details on the mutate
mode in general, see Mutate.
mutate
mode:CALL gds.beta.closeness.mutate('myGraph', { mutateProperty: 'centrality' })
YIELD centralityDistribution, nodePropertiesWritten
RETURN centralityDistribution.min AS minimumScore, centralityDistribution.mean AS meanScore, nodePropertiesWritten
minimumScore  meanScore  nodePropertiesWritten 

0.399999618530273 
0.521904373168945 
5 
3.4. Write
The write
execution mode extends the stats
mode with an important side effect: writing the centrality for each node as a property to the Neo4j database.
The name of the new property is specified using the mandatory configuration parameter writeProperty
.
The result is a single summary row, similar to stats
, but with some additional metrics.
The write
mode enables directly persisting the results to the database.
For more details on the write
mode in general, see Write.
write
mode:CALL gds.beta.closeness.write('myGraph', { writeProperty: 'centrality' })
YIELD centralityDistribution, nodePropertiesWritten
RETURN centralityDistribution.min AS minimumScore, centralityDistribution.mean AS meanScore, nodePropertiesWritten
minimumScore  meanScore  nodePropertiesWritten 

0.399999618530273 
0.521904373168945 
5 
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