apoc.nlp.azure.keyPhrases.graph

Procedure APOC Core

Creates a (virtual) key phrase graph for provided text

Signature

apoc.nlp.azure.keyPhrases.graph(source :: ANY?, config = {} :: MAP?) :: (graph :: MAP?)

Input parameters

Name	Type	Default
source	ANY?	null
config	MAP?	{}

Name

Type

Default

source

ANY?

null

config

MAP?

{}

Output parameters

Name	Type
graph	MAP?

Name

Type

graph

MAP?

Install Dependencies

The NLP procedures have dependencies on Kotlin and client libraries that are not included in the APOC Library.

These dependencies are included in apoc-nlp-dependencies-4.1.0.11.jar, which can be downloaded from the releases page. Once that file is downloaded, it should be placed in the plugins directory and the Neo4j Server restarted.

Setting up API Key

We can generate an API key and URL by following the instructions in the Quickstart: Use the Text Analytics client library article. Once we’ve done that, we should be able to see a page listing our credentials, similar to the screenshot below:

Figure 1. Azure Text Analytics credentials

In this case our API URL is https://neo4j-nlp-text-analytics.cognitiveservices.azure.com/, and we can use either of the hidden keys.

Let’s populate and execute the following commands to create parameters that contains these details.

The following define the apiKey and apiSecret parameters

:param apiKey => ("<api-key-here>");
:param apiUrl => ("<api-url-here>");

Alternatively we can add these credentials to apoc.conf and retrieve them using the static value storage functions. See Static Value Storage

apoc.conf

apoc.static.azure.apiKey=<api-key-here>
apoc.static.azure.apiUrl=<api-url-here>

The following retrieves AWS credentials from apoc.conf

RETURN apoc.static.getAll("azure") AS azure;

Table 1. Results
azure
{apiKey: "<api-key-here>", apiUrl: "<api-url-here>"}

Usage Examples

The examples in this section are based on the following sample graph:

CREATE (:Article {
  uri: "https://neo4j.com/blog/pokegraph-gotta-graph-em-all/",
  body: "These days I’m rarely more than a few feet away from my Nintendo Switch and I play board games, card games and role playing games with friends at least once or twice a week. I’ve even organised lunch-time Mario Kart 8 tournaments between the Neo4j European offices!"
});

CREATE (:Article {
  uri: "https://en.wikipedia.org/wiki/Nintendo_Switch",
  body: "The Nintendo Switch is a video game console developed by Nintendo, released worldwide in most regions on March 3, 2017. It is a hybrid console that can be used as a home console and portable device. The Nintendo Switch was unveiled on October 20, 2016. Nintendo offers a Joy-Con Wheel, a small steering wheel-like unit that a Joy-Con can slot into, allowing it to be used for racing games such as Mario Kart 8."
});

We can use this procedure to automatically create a key phrase graph. One node with the KeyPhrase label will be created for each key phrase extracted.

By default, a virtual graph is returned, but the graph can be persisted by specifying the write: true configuration.

The following returns a graph of key phrases for the Pokemon article

MATCH (a:Article {uri: "https://neo4j.com/blog/pokegraph-gotta-graph-em-all/"})
CALL apoc.nlp.azure.keyPhrases.graph(a, {
  key: $apiKey,
  url: $apiUrl,
  nodeProperty: "body",
  writeRelationshipType: "KEY_PHRASE",
  write: true
})
YIELD graph AS g
RETURN g;

We can see a Neo4j Browser visualization of the virtual graph in Pokemon key phrases graph.

Figure 2. Pokemon key phrases graph

We can then write a query to return the key phrases that have been created.

The following returns articles and their entities

MATCH (a:Article {uri: "https://neo4j.com/blog/pokegraph-gotta-graph-em-all/"})
RETURN a.uri AS article,
       [(a)-[:KEY_PHRASE]->(k:KeyPhrase) | k.text] AS keyPhrases;

Table 2. Results
article	keyPhrases
"https://neo4j.com/blog/pokegraph-gotta-graph-em-all/"	["card games", "board games", "friends", "feet", "Nintendo Switch", "days", "organised lunch-time Mario Kart", "tournaments", "Neo4j European offices", "role"]

If we want to stream back key phrases and apply custom logic to the results, see apoc.nlp.azure.keyPhrases.stream.