@interface PNVisionHelper : NSObject + (id)faceprintFromFaceprintArchive:(id)a0 error:(id *)a1; - (float)distanceBetweenFaceObservation:(id)a0 andFaceObservation:(id)a1 error:(id *)a2; - (id)faceObservationFromFace:(id)a0; - (id)representativenessFromFaceObservations:(id)a0 error:(id *)a1; @end