PageRank

Function

This API is used to run the PageRank algorithm based on input parameters.

PageRank, also known as web page ranking, is a hyperlink analysis algorithm used to rank web pages (nodes) based on their search engine results. PageRank is a way of measuring the relevance and importance of web pages (nodes).

If a web page is linked to many other web pages, the web page is important. That is, the PageRank value of the web page is relatively high.
If a web page with a high PageRank value is linked to another web page, the PageRank value of the linked web page increases accordingly.

URI

POST /ges/v1.0/{project_id}/hyg/{graph_name}/algorithm

**Table 1** URI parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID. For how to obtain the project ID, see Obtaining a Project ID.
graph_name	Yes	String	Graph name

Request Parameters

**Table 2** Request body parameters
Parameter	Mandatory	Type	Description
algorithmName	Yes	String	Algorithm name
parameters	Yes	parameters Object	Algorithm parameters

**Table 3** parameters
Parameter	Mandatory	Type	Description
alpha	No	Double	Weight coefficient (also called damping coefficient) The value range is (0, 1). The default value is 0.85.
convergence	No	Double	Convergence. The value range is (0, 1). The default value is 0.00001.
max_iterations	No	Int	Maximum iterations. An integer ranging from 1 to 2147483647. For frontend calls, the range is [1, 2000]. The default value is 1000.
directed	No	Boolean	Whether to consider the edge direction. The value can be true or false. The default value is true.

Response Parameters

Parameter	Type	Description
errorMessage	String	System prompt. If execution succeeds, this parameter may be left blank. If execution fails, this parameter is used to display the error message.
errorCode	String	System prompt. If execution succeeds, this parameter may be left blank. If execution fails, this parameter is used to display the error code.
jobId	String	ID of the algorithm execution job. This parameter is left blank if the request fails. NOTE: You can use the returned job ID to view the task execution status and obtain the algorithm return result. For details, see Querying Job Status on the Service Plane (1.0.0).
jobType	Integer	Job type. This parameter is left blank if the request fails.

Example Request

POST http://{SERVER_URL}/ges/v1.0/{project_id}/hyg/{graph_name}/algorithm 
{
 "algorithmName":"pagerank",
 "parameters":{
        "alpha":0.85,
        "convergence":0.00001,
        "max_iterations":1000
 }
}

SERVER_URL: Address for accessing a graph. For details about its value, see Using Service Plane APIs.

Example Response

Status code: 200

Example response for a successful request

Http Status Code: 200
{  
"jobId": "4448c9fb-0b16-4a78-8d89-2a137c53454a001679122",
"jobType": 1
}

Status code: 400

Example response for a failed request

Http Status Code: 400
{
"errorMessage":"graph [demo] is not found",
"errorCode":"GES.8402"
}

Status Codes

Return Value	Description
400 Bad Request	Request error.
401 Unauthorized	Authorization failed.
403 Forbidden	No operation permissions.
404 Not Found	No resources found.
500 Internal Server Error	Internal server error.
503 Service Unavailable	Service unavailable.