3 research outputs found
Leveraging Node Attributes for Incomplete Relational Data
Relational data are usually highly incomplete in practice, which inspires us
to leverage side information to improve the performance of community detection
and link prediction. This paper presents a Bayesian probabilistic approach that
incorporates various kinds of node attributes encoded in binary form in
relational models with Poisson likelihood. Our method works flexibly with both
directed and undirected relational networks. The inference can be done by
efficient Gibbs sampling which leverages sparsity of both networks and node
attributes. Extensive experiments show that our models achieve the
state-of-the-art link prediction results, especially with highly incomplete
relational data.Comment: Appearing in ICML 201
JNET: Learning User Representations via Joint Network Embedding and Topic Embedding
User representation learning is vital to capture diverse user preferences,
while it is also challenging as user intents are latent and scattered among
complex and different modalities of user-generated data, thus, not directly
measurable. Inspired by the concept of user schema in social psychology, we
take a new perspective to perform user representation learning by constructing
a shared latent space to capture the dependency among different modalities of
user-generated data. Both users and topics are embedded to the same space to
encode users' social connections and text content, to facilitate joint modeling
of different modalities, via a probabilistic generative framework. We evaluated
the proposed solution on large collections of Yelp reviews and StackOverflow
discussion posts, with their associated network structures. The proposed model
outperformed several state-of-the-art topic modeling based user models with
better predictive power in unseen documents, and state-of-the-art network
embedding based user models with improved link prediction quality in unseen
nodes. The learnt user representations are also proved to be useful in content
recommendation, e.g., expert finding in StackOverflow
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Relational learning and fairness
This thesis will focus on relational learning in the modeling of text and user roles in networks, and the relative treatment of individuals as related to algorithmic fairness. With the exponential growth in social network data, the need for models of user interaction data is growing. This work presents a model which agglomerates users into archetypes based on topical modeling of the contents of their interactions. It further proposes models and a fairness metric for the creation of classifiers for individuals which control for the relative treatment of individualsStatistic