In particular, due to high coreference annotation costs, data sets that are annotated with opinion information (like ours) do not typically include supervisory coreference information for all noun phrases in a document (as would be required for the application of traditional coreference resolution techniques), but only for noun phrases that act as opinion sources (or targets).
we define the task of partially supervised clustering, the goal of which is to learn a clustering function from a set of partially specified clustering examples (Section 4).