We hypothesize in Section 3, however, that the task is likely to succumb to a better solution by treating it in the context of a new machine learning setting that we refer to as partially supervised clustering.
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).