|
|
 |
| |
|
|
|
Topic Model based Collaborative QoS Prediction |
|
|
|
PP: 2545-2555 |
|
|
|
Author(s) |
|
|
|
Jian Wu,
Lichuan Ji,
Tingting Liang,
Liang Chen,
|
|
|
|
Abstract |
|
|
| With the increasing development and growth of Web services on the World Wide Web, the demand of appropriate Web
service selection approaches are unprecedentedly strong, and Quality-of-Service (QoS) based service computing is becoming an
important issue of service-oriented computing. In most of previous works, the QoS values of services to users are all conceived to
be known, however, lots of them are unknown in practice application. Recently, lots of literatures aiming at predicting such missing
QoS values are published, they all consider the unknown QoS values prediction as a fundamental step for the QoS-based service
computing. Looking through existing works, we discover that the online cold-start scenario, in which some new coming Web services
haven’t been involved even once, hasn’t been considered carefully. In this paper, we utilize a collaborative framework by integrating
matrix factorization with probabilistic topic model to predict QoS values. Specifically, the basic idea of the proposed approach is
collaborative filtering via matrix factorization, while the cold-start problem is handled by employing probabilistic topic model based on
WSDL (Web Service Description Language) documents. The experiment are based on two real-world datasets (one contains 100 users
and 150 Web services, and the other contains 339 users and 2344 Web services), and the results demonstrate the prediction accuracy of
the proposed approach. |
|
|
|
|
|
|
|
