I. INTRODUCTION
Web portals are a means of interaction with clients for any
web users or sessions, with common browsing activities,
access pattern and navigational behaviours [2]. The primary
objective of the web user sessions clustering is to group
sessions based on similarity with the aim of maximising
the intra-group and minimising the inter-group similarity.
The user sessions with similar access patterns are clustered
together and analysed by domain experts.
Clustering techniques are broadly classified into two major
classes; One works with feature vectors data (object data
clustering) and the other works with relational data (relational
clustering). Though feature vector clustering is very popular
and receives lots of attention from researchers, yet it is not