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K-Hop

Updated on 2024-05-23 GMT+08:00

Function

This API is used to run the K-Hop algorithm based on input parameters.

This algorithm is used to search all nodes in the k layer that are associated with the source node through Breadth-First Search (BFS). The found sub-graph is the source node's ego-net. This algorithm returns the number of nodes in the ego-net.

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 details about 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

k

Yes

Integer

Number of hops. The value ranges from 1 to 100.

source

Yes

String

ID of the start node

mode

No

String

Search direction. Possible values are:

  • OUT: Hop from the outgoing edges (default value)
  • IN: Hop from the incoming edges.
  • ALL: Hop along both incoming and outgoing edges
NOTE:

When the dataset does not contain incoming edges, if this parameter is set to OUT and an algorithm that does not depend on incoming edges is selected to calculate the output, the performance deteriorates. If this parameter is set to IN or ALL, an error is reported.

switch

No

Integer

When the number of activated edges reaches the total number of edges/switch value, the pull/push mode is switched. The value range is [1, 2000]. The default value is 40.

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":"k_hop",
 "parameters":{
        "k":3,
        "source":66,
        "mode":"ALL" 
 }
}
NOTE:

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.

Error Codes

See Error Codes.

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