We present a novel cooperative strategy based on active learning and crowdsourcing, dedicated to provide a solution to the cold start stage, i.e. initializing the classification of a large set of data with no attached labels. The strategy is moreover designed to handle an imbalanced context in which random selection is highly inefficient. In this purpose, our method is guided by an unsupervised clustering, and the computation of cluster quality and impurity indexes, updated at each active learning step. The strategy is explained on a case study of annotating Twitter content w.r.t. a real flood event. We also show that our technique can cope with multiple heterogeneous data representations.
展开▼
