the-algorithm/graph-feature-service/doc/getintersection.md

GetIntersection

Request and response syntax

A GetIntersection call takes as input a GfsIntersectionRequest thrift struct.

struct GfsIntersectionRequest {
  1: required i64 userId
  2: required list<i64> candidateUserIds
  3: required list<FeatureType> featureTypes
}

The response is returned in a GfsIntersectionResponse thrift struct.

struct GfsIntersectionResponse {
  1: required i64 userId
  2: required list<GfsIntersectionResult> results
}

struct GfsIntersectionResult {
  1: required i64 candidateUserId
  2: required list<IntersectionValue> intersectionValues
}

struct IntersectionValue {
  1: required FeatureType featureType
  2: optional i32 count
  3: optional list<i64> intersectionIds
  4: optional i32 leftNodeDegree
  5: optional i32 rightNodeDegree
}(persisted="true")

Behavior

The GfsIntersectionResponse contains in its results field a GfsIntersectionResult for every candidate in candidateIds which contains an IntersectionValue for every FeatureType in the request's featureTypes field.

The IntersectionValue contains the size of the intersection between the leftEdgeType edges from userId and the rightEdgeType edges from candidateId in the count field, as well as their respective degrees in the graphs in leftNodeDegree and rightNodeDegree respectively.

Note: the intersectionIds field currently only contains Nil.