Publication Data
Half Transductive Ranking
Abstract: We study the standard retrieval task of ranking a fixed set
of items given a previously unseen query and pose it as the half transductive ranking
problem. The task is transductive as the set of items is fixed. Transductive
representations (where the vector representation of each example is learned) allow the
generation of highly nonlinear embeddings that capture object relationships without
relying on a specific choice of features, and require only relatively simple
optimization. Unfortunately, they have no direct outof- sample extension. Inductive
approaches on the other hand allow for the representation of unknown queries. We
describe algorithms for this setting which have the advantages of both transductive and
inductive approaches, and can be applied in unsupervised (either reconstruction-based
or graph-based) and supervised ranking setups. We show empirically that our methods
give strong performance on all three tasks.
