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POCount relationship pairs in Neo4j
 

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  1. POCount relationship pairs in Neo4j
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    <p>I'm starting dealing with Neo4j so I'm not really proficient on this topic. In figure below I have 2-mode (bipartite) graph where green node presents "document" and red node presents "term" which occur in particular document. (Real-world graph is actually huge: about 20.000.000 documents and 25.000 terms).</p> <p>I wonder how I go about counting co-occurrence pairs of terms in neo4j (in Cypher or Java). The desired output from query should be:</p> <pre><code># Example: Pair (term-1, term-2) occurs in doc-1 and in doc-3 # Frequency for pair (term-1, term-2) should be 2 # termA | term B | frequency term-1 | term-2 | 2 term-1 | term-3 | 1 term-2 | term-3 | 2 </code></pre> <p><img src="https://i.stack.imgur.com/oYegM.png" alt="Bipartite graph"></p> <p>Graph is available at <a href="http://console.neo4j.org/r/7fmo7c" rel="nofollow noreferrer" title="Neo4j Console">http://console.neo4j.org/r/7fmo7c</a></p> <p><strong>Code to reproduce test graph in Neo4j</strong></p> <pre><code>set name root mkrel -t ROOT -c -v cd 1 set name doc-1 set type document mkrel -t HAVE -cv cd 2 set name term-1 set type term cd .. mkrel -t HAVE -cv cd 3 set name term-2 set type term cd .. mkrel -t HAVE -cv cd 4 set name term-3 set type term mkrel -t HAVE -d INCOMING -c cd 5 set name doc-2 set type document mkrel -t HAVE -d OUTGOING -n 3 cd 3 mkrel -t HAVE -d INCOMING -c cd 6 set name doc-3 set type document mkrel -t HAVE -d OUTGOING -n 2 </code></pre> <p><strong>Code to reproduce test graph in Java</strong></p> <pre><code>import org.neo4j.graphdb.DynamicRelationshipType; import org.neo4j.graphdb.GraphDatabaseService; import org.neo4j.graphdb.Node; import org.neo4j.graphdb.Relationship; import org.neo4j.graphdb.Transaction; import org.neo4j.graphdb.factory.GraphDatabaseFactory; import org.neo4j.graphdb.factory.GraphDatabaseSettings; public class CountPairs { private static final String DB_PATH = "test.db"; private static GraphDatabaseService graphDb; public static void main(String[] args) { graphDb = new GraphDatabaseFactory(). newEmbeddedDatabaseBuilder(DB_PATH). setConfig(GraphDatabaseSettings.node_keys_indexable, "name, type"). setConfig(GraphDatabaseSettings.node_auto_indexing, "true"). newGraphDatabase(); Transaction tx = graphDb.beginTx(); Node doc1, doc2, doc3 = null; Node term1, term2, term3 = null; Relationship rel1, rel2, rel3, rel4, rel5, rel6, rel7 = null; try { // Create nodes doc1 = graphDb.createNode(); doc2 = graphDb.createNode(); doc3 = graphDb.createNode(); term1 = graphDb.createNode(); term2 = graphDb.createNode(); term3 = graphDb.createNode(); // Set properties doc1.setProperty("name", "doc1"); doc1.setProperty("type", "document"); doc2.setProperty("name", "doc2"); doc2.setProperty("type", "document"); doc3.setProperty("name", "doc3"); doc3.setProperty("type", "document"); // Set properties term1.setProperty("name", "term1"); term1.setProperty("type", "term"); term2.setProperty("name", "term2"); term2.setProperty("type", "term"); term3.setProperty("name", "term3"); term3.setProperty("type", "term"); // Create relations rel1 = doc1.createRelationshipTo(term1, DynamicRelationshipType.withName("HAVE")); rel2 = doc1.createRelationshipTo(term2, DynamicRelationshipType.withName("HAVE")); rel3 = doc1.createRelationshipTo(term3, DynamicRelationshipType.withName("HAVE")); rel4 = doc2.createRelationshipTo(term2, DynamicRelationshipType.withName("HAVE")); rel5 = doc2.createRelationshipTo(term3, DynamicRelationshipType.withName("HAVE")); rel6 = doc3.createRelationshipTo(term1, DynamicRelationshipType.withName("HAVE")); rel7 = doc3.createRelationshipTo(term2, DynamicRelationshipType.withName("HAVE")); tx.success(); } catch(Exception e) { tx.failure(); } finally { tx.finish(); } graphDb.shutdown(); } } </code></pre>
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    1. USAndrej
    1. USAndrej
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    1. COI would suggest creating and sharing the test graph on console.neo4j.org rather than providing code to generate test graph. It would be very helpful and its very easy to create one.
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      1. USGopi
    2. COAdded. URL is http://console.neo4j.org/r/7fmo7c.
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    3. COThanks! That helped me to quickly play with it and get closer to what you want.
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